5 3 cracked flex plate sound

As i was driving into work this morning i noticed a sound that seemed to come from the middle of the car. Id like to hear everyones opinion on this ticking type of sound on my 2008 gmc sierra z71 1500. Pulled one plug from each cylinder, no damages to the plugs. When a flexplate cracks, it often produces a loud knocking noise as it rotates. View profile view forum posts private message view articles view gallery uploads member. It bolts to the end of the crankshaft and the transmissions torque converter bolts to it. There will be four bolts attaching the flex plate to the torque converter and if you get a socket on the main crank bolt you can turn the engine by hand to get at all four. As i start to move the knock speed increases slightly with rpm but then stops and the engine runs fine. It made a huge differance off the line with a 4500 lb truck and a freshly built 5 litre. I have an engine noise at the top end rpm in each gear. When they crack near the crank flange, they sound rodknockish. Maybe the flexplate or converter bolt is loose and not able to spin freely. If the flex plate is cracked, there will be one solid knock sound when you turn the key back on.

As a result, this can cause the flexplate to wobble. Loose torque converter bolts and cracked flex plates. The sound seems to happen most on cold days 40 and under. This video demonstrates the sound, diagnosis and solution to what sounded like a rod knocking on a 1999 toyota 4runner with a 3. If the flexplate is cracked, replace the transmission fluid pump, flexplate, flexplate bolts and torque converter refer to workshop manual, section 30301a and 30701 when replacing the torque converter, ensure that the torque converter pilot hub is lubricated with multipurpose grease xl 5 a esbm1c930b prior to reassembly for claiming, use causal part 6375 and applicable labor. Once the rpms hit 750 the noise goes away to a ticking sound.

Loose torque converter bolts and cracked flex plates diagnosing noises in your car ericthecarguy video description. Checked inspection plate, no carnage but wasnt able to rotate by hand. The classic and most obvious symptom of a cracked flexplate involves the sound it makes while the engine is running. A flex plate is the automatic transmission version of a flywheel. I have access to a shoplift and plan to do this work myself and with a coworker. The flexplate has cracked twice in the past 6 months. I cracked two flexplates on a 350 olds i drove balls out all the time, until i threw away the torque converter and got a good one. Rattle noise and cracked flexplate 20152018 ford edge. Damaged and leaking front seals and front transmission pumps are common symptoms. But honestly it will sometimes happen on warmer days as well. For the life of me cant see how a check engine light would come on from a flex plate being cracked or loose. I would take a look at the flex plate, sounds like it is cracked. I tried to start the car again and it struggled, got it to turn over abit but sound like metal was grinding but did not start. Remove 3 15mm bolts that attach flexplate to torque converter.

The first cracked fp for me i ignorantly assumed the missing torque converter bolt was the problem so i missed the bellhousing problem. Similar in function to a flywheel in manual transmission engines and called a. If its a rod knock, you can make the sound change or go away by pulling off each plug wire one at a time. Also, if the sound goes away or quiets when put into gear, that could be another indicator because as you apply load to the plate, the force is enough to push the crack back together. If it really is the flex plate, thats a lot cheaper than other. So while youre in there, check the flex plate for cracks or damage, you might just find the source of your noise this way. The same things that cause the flexplate to crack can also cause transmission problems. The truck has 172,000 miles on it now and had the trans rebuilt at 88,000. Symptoms of a cracked flexplate general discussion modern. It didnt fix the noise but now when i start the truck it sounds pretty bad only while the starter is engaged. Symptoms of a cracked flexplate general discussion. A serious crack can cause a mild vibration when driving, so can a faulty torque converter.

The flex plate is bolted to the crank at rear of engine. I did a lot of online research last night and think it is most likely a cracked flex plate. Does cracked flex plate makes nocking noise answers. A dropped bolt will definitely make noise but the noise typically. Crawl under there when its running and listen right around the bell housing on the tranny and if its real loud and a very sharp, metalic sound, its a flexplate. I was told that a small crack in the flexplate could mimic the sound of rod knock or piston slap. Noise in my chevrolet silverado sounds like flywheel. My uncle thinks it may be a cracked flex plate from how i described it to him. Can anyone describe what a cracked flex plate sounds like. When you hit the right cylinder with the bad rod bearing the sound will quit or get much.

Those factors ensure that when the engine starts and the driver puts it in drive, the cracked flexplates movement will create a noise. I have a noise under the hood of my 96 legacy gt automatic transmission. The classic and most obvious symptom of a cracked flexplate involves. Bad knock on engine people say flex plate on 1979 gmc 350. If you only tow 5 % of the time and this is a daily driver, then a 3 4 ton might be ok but it is no 12 ton as far as comfort and mileage. I have the back seats out so there isnt too much sound dampening back there, and i have been listening for any odd noises over the past few weeks. It all depends mine cracked around the center and sounded just like loose bolts. However, our duramax diesel has an irritating click sound at idle ive read on truck sites that it can be bubbles in the oil system. A cracked flex plate will usually cause a squeaky sound like a belt but shorter and sharper and changes when in gear or park and under load. Cracked flexplate with audio my d2 td5 auto has been of the road for a 2 12 weeks now. Press the left or right button until confirm is selected on the screen. Sometimes the flex plate will crack and as a result it can cause noise. Customer experienced loud engine noise and our tech found a cracked flex plate from over tightened bolts. Does the sound seem to be coming from the front or rear of the engine.

Furthermore, if not properly diagnosed it will occur again and often damage to the transmission may follow. It will sound almost like an engine knock but will be heard from the area between the front of the transmission and rear of the engine. When the flexplate is just spinning the input shaft and there is no load, they. Op, youve probably got broken teeth on the flex plate, it is going to need to be replaced eventually, if youre getting an intermittent clicking sound from it just keep an ear on it. If you are talking about a flexplate for an automatic transmission the most obvious symptom of a cracked flexplate is a vibration felt in the. Cracked exhaust ended up with transgo stage 3 shift kit, hd flex plate, and billet single disc lock up converter with short cut to allow for flex plate thickness. Long story short, will a broken or cracked flexplate cause an engine not to turn over. Take a long screwdriver prybar, and shove the converter back towards the trans.

Then whom ever replaced the fp before me didnt catch the peened bellhousing and tightened it down causing a alignment problem. Dude, looking at your questions for the past 2 weeks, you should give up trying to fix your own vehicle. Both gas engines and both have a disturbing knock or clunk sound at idle. I hear a chatteringclicking sound coming from either the transfer casetransmission area or from the engine when the engine is at 15002200 rpm under load. I have the ticking sound that sounds like the heat sheild is loose. This allows the engine to be ran seperate from the transmission. However if it had done that you wouldnt have been able to restart the car because the starter would have nothing to spin the engine with. My chevy started this tick noise out of now where thought about it and yea its the flex plate. Theres not alot of space, i used a long box wrench and tapped with a hammer to break loose. A cracked flex plate is almost always a sign of other problems. I pull off the inspection cover and it is so loud im afraid to put my head near the opening. It ended up being the exhaust was partially cracked just above the rear differential. This listing is for a brand new pioneer automatic transmission 168tooth flexplate with weight external balance and bolt set for 19862002 chevrolet small block 305ci 5.

When you crack them out where the converter bolts are, they have a very tinny, almost ringing sound under load, and the cracks are very hard to see. Supposedly chrysler has come out with a new replacement plate that will not crack, and it isnt supposed to be that expensive. Aside from a manufacturing defect, the only things that will cause a cracked flex plate are improper torque on the plate bolts at the crank and torque converter and the most common cause of transmission to engine misalignment. But with a crack flex plate if you press and hold the brake pedel and step on the gas pedel just a little the noise goes away with a rod knock the noise. After some googling and much reading, it looks like i have a cracked flexplate. This truck gonna get a lq4 and 4l60e eventually save to say i love her. It runs fine in park but in any other gear with my foot on the brake it has a very noticeable, almost loud knocking sound. Bad knock on engine people say flex plate on 1979 gmc 350 engine. The sound is very similar to a bad engine rod and is often misdiagnosed. Ok, so i replaced my flexplate 290,000 miles to see if that eliminated the lower end noise in my engine. Pull lower pan,check rod movement,or remove bearing cap.

Im hoping its a cracked flywheel or a bad lifter but im fearing the worst, connecting rod bearing frustrated because its in such perfect condition in and out. One day with the trailer attached, sound move from front to back. Then noise may change when the clutch is engaged or disengaged. A loose bolt on a flexplate or a crack between its bolt holes. The flex plate replaces the flywheel in automatic transmission cars. The flex plate usually makes a tinny or clanging some times chirping sound while starting,shutting off, accelerating or decelerating. The reason for the sound involves the flexplates location and its function. You said you recently replaced the engine with a reman, how long after replacement did the noise start. When its sitting idling in gear its quiet but once the car gets moving 5 mph it starts. Here a video to emphasize the racket a broken flex plate may sound like. Has anyone ever had a flexplate crack, and if so, does it sound like. Descriptions of the sound include clanking, chirping and a light knocking. I would take that cover off and turn the flywheel by hand to see if you can see a loose bolt.