any one help me on this one

[dave waudby]

first im asking about a 5ierra so if this post isnt wanted on here i wont be offended if its deleted

H reg 5ierra 1.8 glx

fully poly bushed front end cant find a single bit of play anywhere, 2 x brand new tyres balanced (and balanced rechecked at another garage ) brand new discs and pads, and still i get vibration through the steering wheel at about 65 & 69 mph the new discs and pads helped a lot it used to vibrate from 63 through to 80 mph and then i darnt go any faster it was bad.

 

any ideas welcome as its driving me nuts

 

also i fitted new proper sized inner tca bolts and ive tightened all tca & anti roll bar bushes up with car on ground full weight ie not jacked up

[w p e]

steering knuckle on rack/column?

[dave waudby]

thanks but no joy

 

no play there i cant find even slightest bit of play in any part track rod ends rack column joint from column to rack track control arms anti roll bar struts strut top mounts

 

strut tops are poly bushed so are anti roll bar track control arms inner and outer

[accord83]

Have you checked the balance on the rear tyres as well, we had an XR2i which shook like a dog with dysentry at 65mph until we balanced the rears.

[dave waudby]

yeah tried that, thanks though

 

any more ideas anyone ?

[caprinerd]

track rod ends, steering rack, steering rack mountings, d bushes, blown front leg.

just off the top of my head mate

[accord83]

This might sound daft, but have you jacked up and spun each wheel slowly by hand and checked for them actually running round, also look head on to see they are not twisted. I've had oval tyres and one that had an internal wire failure which was twisted. Cheap checks to do but when you've tried everything else.... and while it's in the air check the prop shaft joints.

[PaulMags]

I once had a problem like this and it was on a sierra it was down to faulty discs.

[zetecmk2]

check for a 50p'ing effect on the tyres. fooked shocks can cause this and they drive fine slow in the early stage, just an idea...i've seen it a few times

[dave waudby]

track rod ends, steering rack, steering rack mountings, d bushes, blown front leg.

just off the top of my head mate

 

track rod ends/ track control arms been check by 2 mechanics so has steering rack d bushes are poly and pretty new rack mountings are tight (its solid mounted on 5ierra ) all shox are brand new.

 

thanks for your reply though

[dave waudby]

This might sound daft, but have you jacked up and spun each wheel slowly by hand and checked for them actually running round, also look head on to see they are not twisted. I've had oval tyres and one that had an internal wire failure which was twisted. Cheap checks to do but when you've tried everything else.... and while it's in the air check the prop shaft joints.

tyres are brand new, will check wheels again for running round, they dont show bent on tyre balancer machine, not checked prop yet but i will do though shaking is only through steering wheel ?

 

thanks for your reply

[dave waudby]

I once had a problem like this and it was on a jelly mould it was down to faulty discs.

 

discs and pads are brand new, though this problem was much worse before i changed discs and pads so they were playing a part in it. still vibrates intermittently at about 64 and 69/74 mph

 

thanks for your reply

[dave waudby]

check for a 50p'ing effect on the tyres. fooked shocks can cause this and they drive fine slow in the early stage, just an idea...i've seen it a few times

 

 

tyres and shockers are brand new

 

thanks for your reply

[dave waudby]

yippee ive sorted it, it had poly bushes fitted previous to me buying it the ones in the track controll arm/end of anti roll bar were too small in the center of TCA and not nipping up enough to take the play out ( although play couldnt be felt when checking the steering ) i had a old pair of heavy duty TCA bushes and they fit in snug and squash up too been out test driving round the country roads and all seems fine now

 

 

thanks for your replys and yes shockers are new all round tyres are new wheels balanced tracking set etc so you can see why i was getting so frustrated, it was only because i took poly bushes out i noticed this and when i put the heavy duty bush in i saw how much better it fitted happy days :DD

[Trevmk3]

glad you got it sorted Dave

[accord83]

Excellent