Excessive motor vibration when warmed up & idling

2Fast4 · Apr 13, 2006

I get this bad vibration emanating from motor to my steering wheel. It also causes rattles in the dash somewhere. It only does it, e.g., warmed up or hot and come to stoplight and idling. But cold starts or driving or cruising or boosting drives smoothly...only when warmed up/hot and idling...brrrrrrrrr!

I have block-off plate, 16g, afc, uip, magnacore, etc. Wondering what's causing this? Thanks.

Gixxed_Spyder · Apr 14, 2006

Checked your motormounts for wear?

2Fast4 · Apr 14, 2006

I know the side motor mount(by the belts) is broken. But the front one is new with urethane. The rear one is still in good shape.

The_EE · Apr 14, 2006

You should replace them all. When I just had the front one replaced it caused nothing but problems, in fact, it killed the engine mount. All I have left is the rear one to do but let it be known, with the inserts it will make your car vibrate like mad at idle.

10secdreams · Apr 14, 2006

I would look into the motor mounts first. I had a similar situation turned out being the balance shaft belt. The belt wasnt tight when I got replaced, once I tightened it the shaking went away.

2Fast4 · Apr 14, 2006

The_EE said:
You should replace them all. When I just had the front one replaced it caused nothing but problems, in fact, it killed the engine mount. All I have left is the rear one to do but let it be known, with the inserts it will make your car vibrate like mad at idle.

Are you saying urethane inserts are bad idea and good idea is to replace with stock rubber mounts? No inserts but replace with the whole mounts?

Gixxed_Spyder · Apr 15, 2006

2Fast4 said:
Are you saying urethane inserts are bad idea and good idea is to replace with stock rubber mounts? No inserts but replace with the whole mounts?

I originally replaced all of my motor mounts with urethane, and I think 2 weeks later I ripped the tranny and timing belt mount out and replaced them with stockers. With all 4 urethane mounts, the car shook badly...it was terrible. Great for performance, bad for kickin' it around town.

The_EE · Apr 15, 2006

2Fast4 said:
Are you saying urethane inserts are bad idea and good idea is to replace with stock rubber mounts? No inserts but replace with the whole mounts?

Depends. I have 3 mounts installed right now with inserts. the back is not installed yet. I would say get inserts, its cheaper but it will make sitting at idle kind of uncomfortable.

Talesin · Apr 15, 2006

A bit of hearsay; apparently if your radiator isn't sitting properly in its mounts, that can cause undue vibration transfer. Check the uppers and lowers for wear/rotting out.

houstondsm · Apr 15, 2006

I replaced 2 mounts with urethane.. big mistake.. it broke the other mounts due to vibration... i agree get them all replaced.

2Fast4 · Apr 16, 2006

Gixxed_Spyder said:
I originally replaced all of my motor mounts with urethane, and I think 2 weeks later I ripped the tranny and timing belt mount out and replaced them with stockers. With all 4 urethane mounts, the car shook badly...it was terrible. Great for performance, bad for kickin' it around town.

Was your car vibrating "only" when warmed up and idling?
I think urethanes vibrate cold start idles too.

2Fast4 · Apr 16, 2006

Talesin said:
A bit of hearsay; apparently if your radiator isn't sitting properly in its mounts, that can cause undue vibration transfer. Check the uppers and lowers for wear/rotting out.

I see upper ones are wearing out and got more slop play.

Talesin · Apr 19, 2006

Replace or repair them. If it fixes the problem, it's about the cheapest fix offered so far.

Might try spacing it with something like bits of sponge, just to see if the vibration is reduced when the radiator is centered in the mounts.

Excessive motor vibration when warmed up & idling

2Fast4

Gixxed_Spyder

2Fast4

The_EE

10secdreams

2Fast4

Gixxed_Spyder

The_EE

Talesin

houstondsm

2Fast4

2Fast4

Talesin

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