XC90 Vibration at low RPM.

I just replaced a pile of mounts in my 2004 2.5T XC90 to fix an engine thrashing/thumping sound under hard acceleration. That issue has gone now which is great but now I have created another issue (small in comparison). I have vibration at idle and low rpm driving that wasn't there before.. it's not terrible but it's something that bugs me and mainly felt in my hands on the steering wheel.
I replaced the front and rear mounts, the one near the crank pulley, the trans torque mount and the upper torque mount. All rubber (definitely not poly).
Unsure what to try next. Sounds like this is fairly common.
The brands of my mounts are:
Top engine torque mount: Mackay (Rubber square bushing type)
Trans torque mount: Lemforder (Rubber, still seems a very very flimsy small bushing, bigger bushing looks good)
Front Engine mount: Trying to verify brand. Rubber.
Rear Engine mount: Same, trying to verify brand. Rubber.
Mount near crank pulley: Non genuine to save money, unsure of brand. Rubber.
Ideas? I'm determined to solve this.
Which mounts are most likely to cause vibration?
I replaced the front and rear mounts, the one near the crank pulley, the trans torque mount and the upper torque mount. All rubber (definitely not poly).
Unsure what to try next. Sounds like this is fairly common.
The brands of my mounts are:
Top engine torque mount: Mackay (Rubber square bushing type)
Trans torque mount: Lemforder (Rubber, still seems a very very flimsy small bushing, bigger bushing looks good)
Front Engine mount: Trying to verify brand. Rubber.
Rear Engine mount: Same, trying to verify brand. Rubber.
Mount near crank pulley: Non genuine to save money, unsure of brand. Rubber.
Ideas? I'm determined to solve this.
Which mounts are most likely to cause vibration?
Comments
If and when I sus it out I'll let you know. Might help someone else.
Torqued to spec may be a thing??
I got all new on my v70t5 , poly for half and cannot tell when I replaced a shot main engine mount! Funny. Love the rumble though....
No
I also removed some air out of the tyres as I was experimenting with fuel economy with 36psi. That has helped the riding vibration felt through the steering.
I'll see how it all goes driving it to work tomorrrow.
Anything under 37psi and the sidewalls roll badly in heavy cornering
Ive got zero issues with harshness or vibration at any speed
You should inspect the front spring mounts and the rear shock mounts for excessive wear
When they go you can easily get lots of vibration in the cabin
@Philia_Bear I have read in various places online about the problems with those spring mounts. What should I be looking for exactly? Just a flat well worn looking mount?
Hi guys,
I know this is an old thread but thought I would ask since I'm experiencing the exact same issue on my car - 2006 xc90 2.5T. Changed the engine mounts (all 5 of them) with aftermarket ones :( and now I have some really annoying vibration at low RPM especially on the steering wheel. The ones that were taken out were pretty average with cracks on them but they were definitely smoother than these new ones. The suspension spring seats were also changed. My question is, did you ever find the offending mounts? I suspect its going to be the lower front and lower back that are too stiff??
Cheers!
Steve
If you used the cheapest they may well be broken already....
If you put in plastic type ones then you get instant vibration.
There's a reason OEMor made by OEM manufacturer are a price.
Thanks @Ex850R - how can you tell if they are the plastic type ones? They looked very "Rubbery" when I got them 🤔
I mean the many so called sport ones or race ones in many colours you pay a lot for and make it really annoying to drive due to vibration,some don't even last as long as cheap ones.
Check them all again...
The brand name is BAPMIC? It pains me to type that but that's what in there now. Ever heard of them?
No...
This is what I mean :( . @bigal, did you have to replace yours with OEM to sort out your issue?