Rod knock vs flexplate. Find out what it is and the repair cost estimate.

Rod knock vs flexplate These noises might become more pronounced during idling or when shifting gears. And I was going to put it off till i try to build a stroker, but i heard from a guy that works at a tranny shop that theres an inspection cover that allows access to the flexplate bolts, and Oct 17, 2020 · If your Jeep 4. Stock 4 bolt with a cast crank. Dec 29, 2014 · Maybe a cracked flywheel. Go start your car, put it in drive, stand on the brake and give it some gas. The flexplate is similar to the flywheel on a manual vehicle, with some key differences. That's why it's been parked for 2 years. The truck is a 2004 F150 5. If you determine there's a chance it's the flexplate, source a replacement and put it on. After reading all the threads i could find on the above subjects, the closest thing to my problem seems to be flexplate cracking or loose tc bolts. Both sounds are not good for your engine and could lead […] May 30, 2023 · Lifter tick and rod knock are two engine noises caused by different issues. Nov 20, 2023 · I have been experiencing a loud rattling and knocking sound coming from the front of my Vehicle, just around the engine area. If the knock suddenly appears or gets noticeably louder, it's probably a cracked flywheel. My 5. You will be able to tell right away if you have a rod knocking. A lifter can sound like knock as can a bad exhaust leak in the right spot. 7 hemi Truck - What do you guys think this is? Flexplate or Sep 16, 2022 · Familiarize yourself with the symptoms of rod knock and potential causes, ensuring timely diagnosis and repair for optimal engine performance. And if it is rod knock, then your mechanic is probably right, keep driving until it breaks, as this engine us pretty much done for. This loud metal-on-metal knocking points to major internal damage and continuing to run the engine risks complete seizure. Technician B says a rod knock will become quieter as its cylinder is disabled. Anyone know what it is? I don’t know what happened to my post from yesterday. But knowing what rod knock is, and how to fix it, can save you a lot of hassles. Mar 12, 2012 · Yep, rod knock would get louder under increased load, which is contrary to what you indicated was taking place. If your truck is a 1500, or has the 4L60/ 700R4, it will have a removable cover on the bottom of the transmission bellhousing that you can easily remove to inspect the flexplate. Check the torque converter bolts and the flexplate. I replaced the driver side cylinder head last year to fix the infamous cylinder one misfire issue. it also gets louder as the oil heats, which you say is not the case, ergo, I don't think it is rod knock. Kind of rare but based on the lack of maintenance you describe? Not unusual. The connecting rod is responsible for transferring the force of the pistons to the crankshaft. Instead of a clutch, automatic transmissions are equipped with a torque converter, which is bolted to the engine via the flex plate. In that condition, the piston has little pressure on it and the rod can "rattle" up and down on the crank. As a result, the piston will whack the Apr 25, 2025 · Identifying a bad flywheel requires a keen sense of hearing and some knowledge about what a healthy flywheel should sound like. Under moderate load, the piston keeps the rod pressed against the crank and the rattle goes away. It’s caused by excessive clearance in the connecting rod bearing, leading to a knocking sound due to the impact of the metal components. So to understand this further, you need to Identifying Rod Knock vs Flywheel Knock in Engines Engine knocking sounds often confuse users between rod knock and flywheel knock issues. 0t Loud rattle/rod knock-esk sound coming from flywheel/flexplate area? Jump to Latest 5. The transmission shop that did my repair said the replacement flexplate was one solid piece, so it should not fail the same way the original did. Apr 2, 2011 · I have a '99 XJ that makes a knocking noise only when I accelerate. Additionally, a vehicle with a loose flexplate could experience vibration Apr 10, 2016 · Recently my big block started knocking. A rod knock sounds like the tick-tock of a clock. pounds for the flexplate bolts on the 440 in my wife's Challenger because that was the factory spec. It sounds just like a rod knock. I am thinking Oct 14, 2010 · Modular V10 (6. 9K views 2 replies 3 participants last post by Abven15 Apr 1, 2024 kylecreel8 Discussion starter Feb 10, 2004 · Is there pretty easy inspection cover access somewhere? And if I did unbolt it, wouldn't the flexplate and flywheel just rub against one another? What are the odds that any of this would be related to the rollover? It looks like a low-speed rollover to me, so I'm inclined to believe that it was probably knocking when it rolled. Feb 22, 2009 · I'd like anyone to post if they have had a problem with a tick / knock that they've sucessfully fixed. My dad and I rebuilt it using a Summit Racing (Federal Mogul) kit. 8 Aug 7, 2023 · BMW X5 and X6 Forum (F15/F16) > BMW X5 (F15) and BMW X6 (F16) Forum > BMW X5M (F85) and X6M (F86) Forum S63/N63 Engine spun rod bearings damage & Rebuild Feb 14, 2004 · It has developed a very bad knock and I am sure it is a rod bearing, but I would like to know if anyone has ever heard a torque converter make that type of noise, I pulled the cover off and the bolts are tight and flexplate looks fine, the noise is definetly from the bottom rear of the motor (350). Jun 5, 2019 · It's probably a broken exhaust manifold bolt. 030 overbore with . This is what rod knock sounds like. Yep its slow. plus, at the end I let you hear what an Jun 18, 2025 · Mains Rods Rod bearings Pistons Harmonic balancer Flexplate Rod knocking noises, are loudest at higher speeds (over 2500 RPM). It's recommended to investigate further and Intake valve closing point affects cranking compression Aug 15, 2019 · I never heard what a broken flexplate sounds like, so Levy might be on to something since he suffered that failure. Now I have a lound knocking noise coming from the torque converter. I found on the internet. Noise doesn't change from neutral to in gear so I don't think it's flex plate. It will sound like a bad lifter. Then it will pretty much knock all the time and fairly loudly. Jul 6, 2017 · A flex plate normally cracks near the crank hub it will make a knocking sound similar to a rod knock @ idle speed. Jan 30, 2017 · Connecting rod knock starts with knock that occurs when cresting a hill, just as the engine transitions from pulling to grade retarding. So, feathering the gas pedal, may result in a distinctive back rattle, between 2500 and 3500 RPMs. It could be a rod knocking or piston slap . 0L I6), started making a really loud racket during cold starts every morning before work recently. I Nov 3, 2010 · I'm trying not to jump straight to "Rod Knock" like so many dumb hillbillies do. Another possibility is loose flywheel bolts, which can mimic rod knock. Oct 1, 2022 · Put another flex plate on it and start it right there on the ground and see if the noise is still there. I can't imagine it's a rod or valve knock See also Flex Plate vs Flywheel: What’s the Difference? What Causes Flex Plate Problems? There are several possible reasons behind flex plate problems. Feb 6, 2008 · Yeah, it sounds like rod knock but it doesnt get as loud and it doesnt quiet down when you let off the gas. 3 engine has a "knocking" sound coming from the engine, especially noticeable Study with Quizlet and memorize flashcards containing terms like Technician A says disabling a cylinder with a cracked piston will increase the noise. This “rod knock” increases with speed Apr 11, 2006 · Rattle noise- Plenum, Flexplate or Rod? Jump to Latest 13K views 7 replies 6 participants last post by BryanB Apr 26, 2006 M Dec 22, 2011 · im having the same issue. Does that seem right? Would a torque converter or flex plate knock like a rod bearing? May 31, 2019 · A bad push rod you shouldn't have to pull the heads. Its worrying to me because I plan on taking the truck out to utah from NC at the end of September. Learn about loose flywheel symptoms, flywheel knocking, and more. • Used Car Buyer's Checklist - Private or D more Jan 24, 2008 · I've had an apparent flexplate noise problem either loose bolts or a cracked flexplate, for a while now. I had called my dad and asked him about it and he told me to start putting it in gear and outta gear and listen for noise. May 5, 2019 · Doesn't quite sound like a rod knocking . I also used new ARP bolts. This only occurs during idle while the Vehicle is in gear or at VERY low speeds. The rod knock is a midrange sound, whereas a main bearing knock is a deeper bass or almost a damped kickdrum-type sound. It sounded like a rod knock at all rpms, but still started without any weird noises. 0 engine is making a knocking noise, especially after being low on oil, it could be several things. Oct 18, 2013 · Before you pull that 305, check out a few other potential causes of the knock. The problem I have seen before is that the flexplate will crack in a complete circle. My wife's 4runner has a rod knocking . Jun 24, 2014 · 1999 - 2016 Super Duty - 2008 5. It?s hard to tell for sure where it?s coming from. While the flex plate is lighter in weight than a flywheel, it also contains holes that ensure that the plate remains mounted and is properly fitted with the torque system. 010, the pistons are speed pro 0. :flamemad: I have done some searching here on the forums and as suggested often, I checked the flexplate bolts. To me it sounded like rod knock. Will you want to guard it in the best way possible? In this article, you will learn how to differentiate the two problems. Bad wrist pins or worn rings can also cause piston slap. Jun 27, 2022 · Some people ask what is rod knock and others want to know how long can you drive with a rod knock sound. 0 is just notoriously loud. Is it quiet, then loud or loud, then quiet or loud immediately without change? My '99 developed a rod knock after my husband replaced the LIM gaskets but 'forgot' to change the oil immediately, even though I told him to, when I was laid up Mar 30, 2024 · What Is a Rod Knock A rod knock is a knocking noise that originates from the connecting rods in an engine. In this episode I show you how to easily diagnose a Rod Knock vs a Lifter Tick at home in a matter of minutes. Aug 30, 2020 · They are made by most of the flexplate manufacturers and are made from thicker, more crack-resistant material. Anything else it could be? Like a collapsed lifter? I know diagnosing engine noise is quite difficult, but it is a skill that I would like to obtain. 3 months ago the torque converter went out again and was replaced under warranty. They sound similar but very are very different. I've heard of engine noise issues but I have never had any until now. The connecting rod is positioned at the bottom of each piston and is fastened to the crankshaft with a cap. Rod knock occurs when an engine’s connecting rod contacts another surface while valve covers cause lifter ticks. Oct 24, 2008 · My dyno shop sayed they had another low mi L with rod knock too is this a common problem. Also look for any hard contact with the exhaust Oct 28, 2024 · Discover the symptoms of rod bearing failure in your engine, the role of oil in maintaining bearings, and when to consider a replacement for optimal performance. Kind of loud. Let us know what you find when you do this. The customer's son was driving the vehicle for the past few months and ignored the oil 3 days ago · If you hear a knocking sound coming from under your car hood, it may be rod knock. However, your car engine might experience problems, including a lifter tick and rod knock. Confusing a ADP with timing chain is even worse, completely different noises. 5/460) - 460 Knocking noise? - I have a 1989 Georgie Boy 29ft Motor Home with a 460 with 46,000 miles. Feb 12, 2024 · Similar for a rod knock vs. when i drive it makes no noise at all. Find out what it is and the repair cost estimate. We've all been there. 100 dome with two valve Mar 9, 2011 · 1999 - 2016 Super Duty - flywheel or rod? - Can a broken flywheel sound like a rod knocking? I had a small tick before, but my start went out and and after I replaced it, it is knocking and rattling something awful. It can sound exactly like a spun bearing or rod knock. Check Out My New Truck Channel • Will it Keep Running? GMC Sierra - Review / braap_man_official Issues with a 2005 Dodge ram 1500 5. Learn what engine knocking is, its causes like improper combustion and overheating, and how it affects vehicle performance. would the flexplate being cracked or broken make it sound . Aug 28, 2018 · Something that could also be causing the noise and it is similar to rod-knock in some cases but isn't common on Toyota's is the flywheel. im thinking its torque converter. When I put it in park and step on the gas the engine sounds normal, no knocking of any kind. I'm talking about a tick / knock that is It will rattle and sound like a rod knock. When the jeep first fires up, it sounds like its knocking. The truck sounds like it has a rod knocking at the very back lower side of the engine,truck runs very good use'e no oil has no coolant in the oil and no fuel in the oil. May 14, 2023 · 3133 Likes, 67 Comments. Almost sounds like rod knock, but I just put the engine in and its been doing it since i first started it up. No members currently viewing this topic! Dec 5, 2023 · The crank and/or big end of the rod have likely sustained damage and it's just a matter of time until the bearing is beat up and knocking starts again. **** Given all this, I found your observation that "this knock is located on the left front up close to the head" gives credence to @tpass 's theory that it's cold piston slap. Lately I have been hearing a knocking noise coming from underneath the motor. Jan 17, 2023 · The rod and cam bearings had wear, I re-used the mains. which will make it go from one end of the bolt hole to the other at a fast pace. #miata #mechanic”. PITA but a lot easier than pulling the engine to replace rod bearings. 3 about 5 days ago for 20k it only has 146k on it I’ve been getting on it a little hard the past 2 days and it started a slight knock that now is a loud knock I can seem to figure out what it is. One of the primary indicators is abnormal noises coming from the transmission area, such as rattling or knocking sounds. Jul 14, 2022 · Have you ever heard a strange knocking sound or tick from your vehicle’s engine? The strange sound might be a rod knock or lifter tick in action. TikTok video from Dylan Pfohl (@dylanpfohl): “Uncover the truth behind flywheel bolts and rod knock sounds in a Miata. Moral of the story: One-piece-rear-main-seal flexplates are infamous for cracking which sounds like a bearing knock. When I let off the gas and just let it roll it's fine but once I accelerate it knocks. I pulled them out one at a time, cleaned and applied locktite to them and Connecting rod Bearings A damaged or worn connecting rod bearing will produce knock under all speeds. May 26, 2011 · General Q & A - Loose Flywheel Bolts??? - Has anyone had this issue? What did it sound like? Similar to rod knock or pushrod tapping but obviously coming from the bellhousing? How did you determine this was your issue? Does the engine have to come completely out or can it just be lifted? For example, if the flexplate is making chattering noise, knocking sound, rumbling noise, grinding noise then the issue might be due to cracks, misalignment, worn ring gear or simply it's just broken. Vehicle 2000 Buick LeSabre 200k Miles l36 N/A Recently replaced all gaskets on top end (valve cover, upper & lower intake, head gaskets) installed zzp front power log. Then there is always the wrist pin knock. As we mentioned before, there are a number of potential causes of rod knock, some of which require costly repairs and others do not. This noise is caused by the flexplate hitting against the engine block or transmission housing. It has over 200,000 miles on it. 4 Knocking Sound - I have had this truck for several years. Oil pressure on the jeep is also fine. Your flexplate could also be cracked as well, -certainly not unheard of on a 6. And for those who are curious, I'm going to change the oil and cut the filter this weekend. Re: Rod knock or Cracked Flexplate or ?? - 10/19/1605:15 PM Those pictures don't strike me as "wear", that looks more like damage that could have only occurred at time of install to me. The connecting rod (hence referred to as the rod) is attached to the crank, and between the two is a bearing constructed of a softer material than either the rod or the crank. its deffinatley not motor knocking. Its a steady knocking sounds and is pretty loud. Oct 2, 2021 · Hi guys so I just bought a 2000 7. It is loud like a rod knock but This is a visualization of what an engine rod knock is and what has to be replaced. I pulled the inspection plate off but cant tell anything. Seems the XJ I just bought has rod knock that I didnt notice on my initial test drive before buying it. I have seen a bunch where motor was pulled for said rod knock and broken flex plate was found. I have only had a few issues. Sep 6, 2016 · This Video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 Toyota 4Runner with a 3. Only reason I havent Not sure if rod knock, or piston slap. Get expert advice from RepairPal. Find out why here. Aug 4, 2011 · Loose flexplate/converter bolts make a nasty sound similar to a rod knock, but immediately go away as soon as you try to accelerate the mass. Thanks for any input! May 11, 2002 · Big Block V8 - 385 Series (6. Take the Inspection plate off and turn the engine by hand to check the flywheel. This guide details the causes of rod knock, its symptoms, and how much it’s going to cost to fix (hint: it’s a lot). My immediate thought was a rod knock but maybe it’s more on the line of a bad lifter? 75k miles. Common causes include insufficient lubrication, engine wear, and poor fuel quality. The heads of the May 9, 1999 · Customer: I have a 1999 5. Aug 27, 2018 · What is a rod knock? A rod knock is a deep rapping noise that comes from the engine. It is caused by wear or damage. It's a real common problem and they make patch-up brackets for $30 if you don't want to fix it the long way. What is Rod Knock? Rod knock is the sound of one or more of your rods “knocking” on the crank as it rotates in a different direction. I have about 2500 miles now on a 454 rebuild. A cracked flexplate can also cause ticking or clanking sounds from Oct 5, 2004 · The best way to tell if you have a rod knock is to get a long screwdriver or something like that, and put it up against the engine block when it's running, and put your ear on the other end. it also stops making noise at idle sometimes. 1K subscribers Subscribed Jan 24, 2014 · Got a knock sound from your engineor maybe a tapping noise in your engine? Learn how to diagnose common engine sounds so you can troubleshoot the underlying problems. When functioning correctly, the flywheel maintains smooth transmission engagement and engine performance, keeping noise levels to a minimum during idling and gear shifts. Jan 5, 2015 · I made my Windsor flywheel work on my romeo engine simply by drilling the holes out a little bigger. I also considered the exhaust manifold gaskets due to potential overheating and wear, but there are no exhaust issues like bad smells, codes, or leaks. A flexplate could cause a bit of a rattle, but if it walks like a rod knock, and quacks like a rod knock, it's probably a rod knock. A loose torque converter, loose bellhousing bolt or cracked flexplate could be creating the knock. I pulled the motor cause I thought I had a bad rod bearing . It goes away if I tap the excellerator. Mar 11, 2024 · How to Fix a Rod Knock If you hear a rod knock, it’s probably because of something on the engine’s inside. Difference between a Subaru engine rod knock vs who a piston slap (which is minor) sounds like. The cracks will have rust @ the parting lines. Subaru Engine / Rod Knock Vs Piston Slap MotorCarNut 55. 9 24v cummins in a dodge 3500 daully with auto trans 2 wd. And, the sound is very similar to a bad connecting rod, and is often misdiagnosed. We’ll explain in detail what you need to know and how to prevent rod knocks. Feb 7, 2024 · Bad flexplate symptoms in an automatic vehicle include clunking or grinding noises from the rear of the engine when idling, knocking noise when shifting into drive or reverse, vibrations felt through the driver’s seat, a rough-running engine, and loss of power at higher speeds. Dec 27, 2022 · The engine’s flexplate is a critical part to transferring power to your drivetrain. However, a failing flywheel emits a choir of unwelcome sounds that can range from rattles to A rod knock is one of these engine issues that might make you move towards trading or selling off your baby ride. Change the oil, listen very carefully when you start it up. Rod knock produces a deep, rhythmic knocking that varies with engine speed, often louder under load. Later rod knock can become constant. Jun 4, 2020 · A flexplate does not feature any friction surface as the use of the clutch is not involved. Oct 7, 2023 · What Is A Rod Knock? What Causes Rod Knock? Rod Knock Symptoms How To Fix Rod Knock Rod Knock Repair Cost Piston Slap Vs Rod Knock Frequently Asked Questions Conclusion What Is A Rod Knock In simple terms, a rod knock is a sound that is created when one or more of your car rods “knock” against the crank as it changed directions while rotating. If it is rod knock what is the easyest way to fix it or do i have to pull the whole front end off and pull the motor to rebuild. Jan 3, 2009 · 2002 excursion 7. My Escape currently has under 3,600 miles Apr 20, 2018 · Might be that I'm just a little paranoid after experiencing a rod knock on the previous engine, but I wasn't really satisfied so I got under the car and disconnected the TC from the flexplate, and it does make some kind of knock sound when I turn the TC back and forth by hand. However as soon as I give it some gas it goes away and is gone for the rest of the day. Im trying to figure out if this is a rod knock or valve’s. 2/6. It sounds like a Woodpecker and rod knock. Rod Knock will get progressively worse sounding during decel. Flex plate will sound worse during idle Something rattling around or hitting things will sound mostly all the time. She doesn’t know what motor it is but to narrow it down it’s naturally aspirated. WV Off Road Club Jul 24, 2005 · Same thing happened to me . 4L V-6 engine. Sep 22, 2023 · I was watching a Uncle Tony video and he said the way to distinguish between a rod knock or a crack flexplate is to put it in drive and see if the knock goes away. New manifolds are only $60 with gaskets and new boots. 4L Toyota Camry 2AZ-FE with oil consumption. Sometimesusually shortly after I start the truck when I'm accelerating up an incline (where more torque is on the engine) I get a sound that sounds like my radiator fan is whacking into my fan Oct 24, 2024 · Strange Noises Cracked plates are loud and make repetitive knocking sounds often mistaken as rod- or main-bearing noises. ️If you find A knocking rod will make a sound emanating from the lower part of the engine, and probably get worse with more RPM. I have eliminated the possibility of rod knock as it immediately goes away. Mar 27, 2015 · We took the truck back to the machine shop and they looked it over and said that it's either the flex plate (bent) or the torque converter. But, then again, for the untrained everything is possible, so all possibilities are valid here. Jul 1, 2025 · Learn the difference between flywheel and flexplate. I May 11, 2002 · Big Block V8 - 385 Series (6. 8l) - Knocking between between engine and transmission - Truck in my signature. mine sounds like a rod knock at idle. The problem turned out to be a cracked flex plate Jul 16, 2025 · The number one sign of a cracked flexplate is a rhythmic knocking or ticking noise when the truck is in Park or Neutral. Feb 14, 2019 · To ME the characteristics of the noise are it sound both like its coming directly from the front of the transmission and the water pump (every single time without fail you can put a stethoscope on the motor and hear it loudest there), it sounds almost like a mix of rod knock and lifter tick and importantly it doesn't go away when warm. A friend sent me this video. Rest assured, your engine is still repairable. or an engine knock trust me. Another noise that a bad flexplate can create is a knocking sound coming from the bottom of the engine. We demonstrated what rod bearing knock sounds like on this car that has only 90k miles but it did not have regular oil changes and as a result the engine developed rod bearing wear which lead to Jul 23, 2017 · A broken flexplate can be confused with a rod knock, but a rod knock vs lifter?, I don't think so (well, I'll take it back, I guess you can). Oct 20, 2019 · Ordinarily, Rod Knock Sounds DIMINISH with increases in RPM. It just seems to fast. The car featured is a 2009 2. I asked a couple people and they said could be a fuel knock from a Jul 20, 2009 · So I'm afraid I either have some detonation or "knock" in my new engine in my 89 2500 burb 350 TBI. If enough rod bearing material has been worn away, it may even, double knock. 3l the transmission was rebuilt with a "bulletproof" rebuild a little over 2 years ago. Know common problems, replacement costs, and how to choose quality parts. Piston slap, potentially due to a broken piston skirt (common in 96+ models), is a likely culprit. Another reason is the 4. If you’ve got a rod knock, stop driving the vehicle - your engine is on limited time and will need replacement or major repair. Jun 22, 2020 · One of these is the tapping noise of rod knock. You can run it without water long enough to here if the noise is gone. You need a new flexplate anyways. Aug 2, 2018 · Can a rod knock for 2k miles, or am I missing something here? I've always thought rods knocked at idle up to redline, and piston slap was the same. All bearing journals turned . Today I noticed a knocking coming from the engine between 1800 and 2200 rpm, in Park. Jun 19, 2007 · Slag Kustom Member from northern new jersey cracked flexplate sounds very close to a rod knock. The following are causes of connecting rod bearing noise: Excessive bearing Sep 17, 2011 · A4 or M6? Almost sounds like a bent/cracked flexplate that you are describing. I swore it was a rod knock and I replaced all the rod and main bearings and then when I started the truck back up I still heard some noise. This article will unveil what rod knock is, the symptoms of a rod knock diagnosis, and how to fix it. The difference in the sounds in a rod knock. Suggest checking the starter. 1 active, 1 guest, 0 members, 0 anonymous. Aug 28, 2006 · I had one in a Cherokee that was broken around ALL of the TC bolts. When your vehicle engine produces unusual sounds, you may not know whether it is a lifter tick or rod knock. A screeching noise as described can be caused by a starter bendix that does not retract all the way. Oct 14, 2014 · When you pull the bad boi, the knock will stop, go away, or get much less pronounced. When a vehicle’s connecting rods inside the bearings have excessive clearance, movement is affected. Jan 26, 2019 · I went with 55ft. The knocking is contstant at all rpms and there is no white, gray or black smoke. Piston slap is excessive piston-to-wall clearance that some engines were notorious for, like some GM LSx series engines in trucks. Who is correct?, All of the following are causes of thrust bearing failure, EXCEPT _____. , Technician A says that during engine disassembly, all main and rod bearings I understand that you're in denial, and looking for anything that isn't a complete rebuild. It is simply a knocking noise from the engine and you should not drive it. Comparison Between Lifter Tick And Rod Knock This article is for you if you have trouble differentiating between a tick and a knock. Here is a similar sounding Video of a 2003 Trailblazer with a Cracked Flex Plate at Idle: Dec 18, 2022 · In this article, we'll look at two engine issues: engine knock and lifter tick, and how to differentiate them in terms of their definition, diagnosis, and fixes. Nov 14, 2025 · One sound that does, “rod knock”, requires immediate action. Check the flexplate for cracks , I get it up on my Kwik Lift , and found the crack , New flexplate , no more noise . A broken or loose flywheel can sound very similar to rod-knock in some cases. The knocking started Feb 7, 2024 · Bad flexplate symptoms in an automatic vehicle include clunking or grinding noises from the rear of the engine when idling, knocking noise when shifting into drive or reverse, vibrations felt through the driver’s seat, a rough-running engine, and loss of power at higher speeds. Just make sure you have some sort of towing service handy. A car engine is the heart of your car. Using the correct part is imperative to engine longevity and proper drivetrain assembly. Jul 15, 2023 · Rod knock is a deep rapping noise that originates from the engine, often becoming louder as the engine speed increases. A cracked flexplate can also cause ticking or clanking sounds from Nov 14, 2025 · One sound that does, “rod knock”, requires immediate action. 4 is making a knocking sound that just started. With the emphasis on CHEAPER/CHEAPER/CHEAPER, the manufacturers have been forced to use thinner, inferior materials to make the stock flexplates from and they crack easily. Lifters yes. But it also could be a rod knock. When the piston changes direction, metal hits metal and produces a knocking noise. We will Oct 14, 2014 · Typically a rod will knock louder when the engine is under a load, less at idleuntil it gets pretty bad and the bearing is spit out from under the cap. the truck developed a small bounce at a stop when i let go of brake pedal. Nov 11, 2010 · Any knock or rattle can be cause for concern, particularly under light load. Listen to what an engine knock/rod knock sounds like on any combustion engine. A rod knock would have more of an undulation and be more consistant with revs, and almost go away at idle. im just Jan 8, 2024 · A loose flexplate in an internal combustion engine can exhibit several noticeable signs that indicate potential issues. Jul 20, 2025 · So, a loose bolt on a flexplate or a crack between it’s bolt holes, can result in a knocking or rattling sound. Typically a rod will knock louder when the engine is under a load, less at idleuntil it gets pretty bad and the bearing is spit out from under the cap. Connecting rod knock noise increases in volume with engine speed and is at its loudest on deceleration. From reading on here, a lot of the problems are caused by the common cracked exhaust manifold. He might be lucky; the knocking might be related to the trans swap. Plus, I really don't see too many people spinning rod bearings on here. Push down sharply on the piston and listen for a knock which would indicate loose clearances on the Rod Bearing. all kinds of opinions , rod knock , piston slap , ok , I'm really hard of hearing so I ask a good friend who has been a mechanic all his life , and can hear really good , So Don , listen to this , first thing he said was , its not the engine . Before we dive deep into all these, what is rod knock? Oct 17, 2009 · There is a real loud knocking sound coming from what sounds like the torque converter or flywheel area. Flywheel knock is usually a metallic clunk near the transmission area during clutch engagement or idle. After putting about 50 miles on the car I started it one day and heard a terrible knocking noise from the bottom of the engine, sounded like a rod knocking After a stressful hour of trying to locate the source of the noise I Jun 27, 2021 · It seems like a rod knock but those usually rattle the whole way up, show low oil pressure, and dont run well. There will be speed variation from the motor and the torque converter will be trying to go a constant speed. Jun 15, 2023 · 2019 Accord 2. 0/429, 7. During the early stages of wear, connecting rod noise may be confused with piston slap or loose wrist pins. Mar 25, 2022 · This post is about rod knock and what I have done to temporarily fix it and what I plan as a permanent fix. 3. The difference between an engine knock and a valve train noise is the speed of Feb 8, 2016 · Another thing you can do is remove the bolts holding the torque converter the the flexplate, push the torque converter back (and ideally tie it that way), then start the truck and listen. 5. 1/370, 7. Dec 16, 2005 · I've searched many times for: rod knock, lifter noise, rocker noise, pushrod noise, crank bearing knock, wrist pin knock, piston slap, and flexplate cracking/loose tc bolts. It sounds like around the Apr 29, 2023 · Most reasons behind the rod knock sound include oil-related inconsistencies, worn components, and improper upkeep/assembly. It has survived 2 burn outs and 20 miles of driving since I did that little "custom" work. So long story short I pulled the trans and the flywheel was cracked all around the bolt holes. a main bearing knock. In other cases, I understand that you're in denial, and looking for anything that isn't a complete rebuild. Jun 26, 2020 · It could be the flexplate, which commonly cracks on a 4. i removed trans and flexplate looks fine. 4 3v with 178k Apr 24, 2025 · Lifter tick vs rod knock—what's the difference? Learn how to identify these engine noises, their causes, potential damage, and how to fix them. It is a 6. Yours may not be cracked but I would assume the loose and missing bolts would Aug 17, 2015 · Hello , My 2001 XJ (4. 60 pounds of oil pressure is a lot, but when the oil is cold its thick enough that it won't tell the true story unless its fully warmed up ~200*F. Flexplate is brand new and torqued correctly. Loose torque converter bolts are 100 times more likely too, but either way you can see the crack (s) pretty easily if you drop the inspection cover. Apr 20, 2019 · After a month or so the rattle became a pretty loud knock, not quite as bad as that in the video posted above but pretty loud. A rod bearing wouldn't cause that—it would just seize and throw a rod into the wall, which leads me to suspect the flexplate. It sounds like around the My 2010 Chevrolet 1500 pickup with the 5. If you hear any unusual noises coming from the crankshaft, it’s worth investigating in case there’s anything wrong with the flywheel or the flex plate. oruyatt hpfodyr ozbe clghml rabltk iydnfolt xdswhk zhuenp tei ijej pcvyc rafcl zgla ctfbbfo pfivh