Wightsparks
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I have been trying to track the source of an annoying low level vibration in my (otherwise very lovely) Convertible Auto OG Saab 9-3, it has been difficult to pin down to say the least and a lot of work has gone on to no avail.
Stopped at idle I can feel it as the same frequency but not so strongly (except in R), a phone app vibration meter says it is twice as strong in the wheel and drivers seat base than the passenger seat or car body. Does not seem to change under load ie A/C or lights etc
Driving, it does not seem to change much with road or engine speed... but it gets less under acceleration and slightly stronger at lower speed. Same in N or Drive at 30-50mph
Not related to steering L/R
Not related to braking (ie warped rotor)
Yes as a convertible if you go over a bump the whole thing shakes but it is not that.
So far - inspected all the engine mounts - all seem to be OK.
Wheels balanced and swapped, tyres are good quality Uniroyals with low mileage
Alignment done recently
Changed LHS drive shaft + CV
Replaced all of the front suspension bushings, and drop links
Replaced RHS rear axle bush, bump stop and lower spring pad (got LHS bits but not done yet)
Any ideas welcome as it is driving me nuts!
To the PS question - one of the things I thought to look at was the tie rod ends (yes it does not really fit the scenario but..) , standard test for this is to jack up a wheel and see if you can move it holding it in the 3/9 o'clock position. Well it moves - but there is no play in the system - because the other wheel (on the ground) moves too - so I am working it against the PS hydraulics - even with the engine running - that does not seem right to me and google is not turning up anything. Should I be able to do this ?
Stopped at idle I can feel it as the same frequency but not so strongly (except in R), a phone app vibration meter says it is twice as strong in the wheel and drivers seat base than the passenger seat or car body. Does not seem to change under load ie A/C or lights etc
Driving, it does not seem to change much with road or engine speed... but it gets less under acceleration and slightly stronger at lower speed. Same in N or Drive at 30-50mph
Not related to steering L/R
Not related to braking (ie warped rotor)
Yes as a convertible if you go over a bump the whole thing shakes but it is not that.
So far - inspected all the engine mounts - all seem to be OK.
Wheels balanced and swapped, tyres are good quality Uniroyals with low mileage
Alignment done recently
Changed LHS drive shaft + CV
Replaced all of the front suspension bushings, and drop links
Replaced RHS rear axle bush, bump stop and lower spring pad (got LHS bits but not done yet)
Any ideas welcome as it is driving me nuts!
To the PS question - one of the things I thought to look at was the tie rod ends (yes it does not really fit the scenario but..) , standard test for this is to jack up a wheel and see if you can move it holding it in the 3/9 o'clock position. Well it moves - but there is no play in the system - because the other wheel (on the ground) moves too - so I am working it against the PS hydraulics - even with the engine running - that does not seem right to me and google is not turning up anything. Should I be able to do this ?