Vibration Noise During Moderate / Hard Acceleration

[kyepan 291]

Hey there,

 

Hard acceleration in my car, is greeted with a plethora of humms vibrations and grinding noises..plus it gets a funky over 80.. how hard you accel determines how loud the noises are.

 

Done a few searches on this and have it down to either or all of the below.

 

1) Lower engine mount worn, causing engine to tilt and manifold to touch bulkhead / downpipe to touch subframe brace (this has a shiny spot)

 

2) Worn CV joint / wheel bearing - Grinding on right turns under power coming from drivers side hub area.

 

3) passenger side wheel bearing gone - tinny high pitched squeal when driving and turning right.

 

4) diff ? can this cause the noises...

 

 

Things I have checked or am about to fix.

Checked for play in passenger side wheel, nothing at all, not even a hint, but the track rod end boot is dead.

Waggled all the drive shafts, up / down in and out plus rotation.. all very tight hardly any play at all.

Diff - about 5 degrees of play, and it clunks upon changing direction.. this worries me a little.

 

Am changing the engine mount quite soon with Jay, as i know him from GTIROC, we are going to check the drive shafts and repack the cv joints at the same time, and do diff oil seals.

 

Once again, any help appreciated.

 

Justin.

Edited March 7, 2006 by kyepan

[hengti 2]

if it were your engine mounts, you'd get all sorts of clunking when changing gear in particular

 

diff can get a bit noisy with high mileage - nothing to worry about

 

likely culprit (from your description) is CV joints - take it out into a car park and drive it slowly on lock in either direction; any clicking = shot joint

 

you can't buy new ones - you'll need to get a new driveshaft (about £50). Could try a scrappy for a CV on it's own though

[pugrallye 0]

have you checked for exhaust touching body work?? this makes a horrendous noise..

[kyepan 291]

if it were your engine mounts, you'd get all sorts of clunking when changing gear in particular

 

diff can get a bit noisy with high mileage - nothing to worry about

 

likely culprit (from your description) is CV joints - take it out into a car park and drive it slowly on lock in either direction; any clicking = shot joint

 

you can't buy new ones - you'll need to get a new driveshaft (about £50). Could try a scrappy for a CV on it's own though

thanks i'll check that tonight. after dark.. in a secluded car park.

[boombang 2]

Could be exhaust on the subframe - very common and can sound very much like CV joints.

[kyepan 291]

have you checked for exhaust touching body work?? this makes a horrendous noise..

I think the down pipe might be touching on the bar that runs between the lower sub frame mounting points as there is a little shiny patch. The whole center exaust section seems a bit low where it comes down from the manifold.

 

Its an MI16 using what looks like a standard MI16 manifold. it only has 10mm of clearance at the bulkhead... are their any other alternatives that give a bit more clearance. If it dries up i'll get some pics.

[KRISKARRERA 2 1 Cars]

Is the car lowered?

[Higgy 0]

have you checked for exhaust touching body work?? this makes a horrendous noise..

 

I hoped after puting the Mi in, I would get away with not cutting the downpipe. But my exhaust touched.

 

I dont remember the noise much because I was driving around with the windows down, listening to that lovely Mi noise

[kyepan 291]

Well ...done some checks last night... driving round in circles on lock.

 

Clock wise circles, there is a grinding from passenger left hub, really sounds like a bearing, you can even feel it, so changing that on sat..

 

Anticlockwise circles, there is a clicking noise from drivers hub, so that must be the splines in the CV joint on the outboard side.. New driveshaft needed there then.

 

If anyone has some good condition 1.9 Hubs and Driveshafts for sale, PM me asap.

 

Also if you change gear and drop the clutch, BONK.. you can clearly hear the exaust hitting the subframe... Engine mount also needs doing, and a chopped manifold is on its way..

 

so thats all sorted then..

 

PS.. i really mean it about those 1.9 shafts and hubs.. gimmie gimmie gimme...

Edited March 10, 2006 by kyepan

[kyepan 291]

big thanks to jay, for doing the engine mount today, its now no longer making horrendous noises on acceleration, the mount was very dead, and could be twisted by hand.

 

Also changed the wheel bearing, much better..

 

comedy moment of the day, fiddling with the AFM/battery position, dislodging an ht lead, going up the road on 3 cylinders and proceding to touch the engine when it was arcing across.. 4 or five electric shocks later, i managed to let go and jump back about 8 feet dropping the bonnet.. not the sharpest tool..