hey guys i have spent over $600 trying to diagnose the vibration problem with no success. i have replaced the center hanger bearing, trans mount and replaced the tires but that has made no difference. when i rev the car in neutral it still vibrates. when i'm rolling down a hill in neutral without accelerating it still vibrates. their is a noise coming from the transmission tunnel whenever i accelerate. if anyone has any idea as to what could be causing this vibration, it will be greatly appreciated.
Auto or manual? Have you looked at the engine mounts and the trans mounts. These are prone to failure after lengthy periods. Usually the engine mounts completely seperate leaving the engine to just sit there under its own weight. Same deal for the trans mounts. If auto, maybe there is a problem with the torque convertor.
If it vibrates in neutral then it's hardly engine related. Have you checked/replaced the tail-shaft universal joints(not the centre bearing)? They will create a serious vibration and a lot of noise if they are badly worn.
Beastly did not specify if it's happening while stationary. Is it? If it is happening while stationary then it is engine related, if not look elsewhere, drivetrain. Where is the vibration felt, in the steering wheel, the whole car? Does it vibrate hard and with low resonance or fast and small vibrations. Did the vibration just start or was it progressive? Could be brakes, tyre out of round, wheels out of round, worn rack ends worn rubbers in general. Beastly please be more specific about the vibration so we can help.
If its an auto, I have seen something like where the transmission input shaft was bent. I ran it on the hoist and could see the tail of the transmission wobbling back and forth about 5mm. It had apparently been rebuilt but they must have missed this. I had already changed out all the mounts etc but it didnt fix it either.
have you checked to see if any of your rims are buckled? wheel balance, wheel alignment also, check all your bushes on all suspension components
He said when he revs it in neutral it still vibrates. I assume its at a standstill when he does this. Eliminates all the rolling components if that is correct.
it is a manual and i have replaced the the trans mount. some people have told me about the engine mounts but im not too sure. is their a way i can be absolutely sure its the engine mount?
hmmm that could be the cause of the problem...but can i replace the uni joints on the tail shaft or do i need to buy a whole new one?
its happening while stationary as well as moving. t he vibration can be felt mostly through the seat and a little through the steering wheel. the car had the vibration when i bought it. it is quite a strong vibration and no matter what gear im in its really bad at 2500 revs.
Ok so forget about all the wheel and the drive shafts etc. Didnt you say engine mounts are changed?? Couple of items to check. Engine mounts if they havent been changed. Do a compression test, If you have one cylinder down on compression a lot it will idle like a dog and potentially not be smooth throughout the rev range. HAs it got a stock balancer on the front of the engine? or one of those crap alloy ones?
Missing cylinder would be felt at all rev ranges and less at idle. But just in case how old are the spark plugs, PTU, connectors and injectors? Sounds more like a resonance thing to me if it is wose at 2500, look for cracks in the rubber on the engine pulley and check engine mounts. Or as Tekky said it could be a lightened pully causing the problem. Could the flywheel be out of ballance? Don't know how it wouls happen though. Last guess, I did drive a car once and the whole car vibrated because the exhaust was touching the chassis somewhere.
eagerly watching this thread as I have what sounds like the same issue, except I have an auto, compression tests are all 165-175 all mounts are in good condition, I know one turbo is losing oiln and there is oil going into one side of the intercooler. I am wondering if some is making its way to the engine and causing an imbalance, other options I have though of is a slightly dodgy injector. my problem has been there since I got the car and has seen through a pcv valve replacement, and full service
Uni joints are replaceable items(you don't need to buy another tail-shaft). It is possible that you have more than one problem. As an example, you may have stuffed engine mounts AND stuffed uni joints(leading to the symptoms that you have described).
In this case, surely, it must be forward or included in any rotating part that is moving/rotating while the engine is running and the car is not moving. I feel this would eliminate the drive-shaft and all to the rear of that including uni joints. What happens if you depress the clutch pedal while stationary in neutral, does the vibration continue?
Who replaced the drive shaft center bearing? Yourself or a shop? Sometimes when these are replaced the shaft doesn't get put back together correctly. And will vibrate as a result. If it was a shop. They should have rebalanced the shaft. And recommended replacing the uni joints if deemed faulty. So who did it?
my zed is auto also has a really bad vibration, does it through all gears and neutral but only when moving, i know 100% its my prop as its tt front half, new centre bearing and Na rear half. have to remove it to have it balanced as well. is horrible to drive as is and with it out of balance there is the chance of it throwing it self apart though the vibrations resulting in serious problems, get yours sorted mate and good luck.
