Anyone experience vibration at idle?

[jamieburke]

Hi everyoneMy car seems to be vibrating when I start it and it's idling- I can feel a slight vibration through the steering wheel and on the door when it's open.I know it may always have do e this and I'm suddenly become aware of it- I don't drive the car much- but has anyone else experienced this or can put my mind at ease?Car drives done incidentally, good as ever.BestJamie

[britlude]

had something similar on mine, felt like an engine mount gone or something.....

now i've put the fear of God up you, turns out it was the alternator belt oscillating at a particular revs, in my case it was cold fast idle!

there was a little slack in the belt that turned into a dramatic vibration when is hit it's oscillating sweet spot... tightened the belt and all was well :)

that might be it, def worth a look!

[jamieburke]

had something similar on mine, felt like an engine mount gone or something.....

now i've put the fear of God up you, turns out it was the alternator belt oscillating at a particular revs, in my case it was cold fast idle!

there was a little slack in the belt that turned into a dramatic vibration when is hit it's oscillating sweet spot... tightened the belt and all was well :)

that might be it, def worth a look!


Good of stuff I'll check that, thank you!

jamie

[Trident]

Bear this in mind too.
en.wikipedia.org/wiki/V6_engine

[NSXGB]

Have you cleaned your throttle body & PCV valve lately?

[AR]

Not a misfire?

[WhyOne?]

I thought that the engine was naturally a little unbalanced at idle?

[NSXGB]

I thought that the engine was naturally a little unbalanced at idle?

AFAIK only a little but not enough to be felt through the steering wheel.

[andystevo]

I reckon my car now vibrates slighty at idle, particularly when cold. Only noticed it after I had the crank pulley & auxiliary belts changed. Also a momentary resonance at 1200rpm when pulling away in first gear (can't replicate it when stationary in neutral i.e. when engine's not under load).
Car's running absolutely fine (did >1300 miles on the recent Europe Tour without issue).

[WhyOne?]

AFAIK only a little but not enough to be felt through the steering wheel.

True.......

[britlude]

I reckon my car now vibrates slighty at idle, particularly when cold. Only noticed it after I had the crank pulley & auxiliary belts changed. Also a momentary resonance at 1200rpm when pulling away in first gear (can't replicate it when stationary in neutral i.e. when engine's not under load).
Car's running absolutely fine (did >1300 miles on the recent Europe Tour without issue).

see post 2!!!!! alternator belt needs tightening!

[andystevo]

see post 2!!!!! alternator belt needs tightening!

ok, ok - belt tension gauge just bought on ebay.
Great excuse for buying yet another garage tool which I'll likely never use again!

[jamieburke]

A friend suggested it could be the plugs- apparently they don't like a lot of cold starts which, with how little my car is used, counts for a lot.

ill try it and report back

[Nick Graves]

I thought that the engine was naturally a little unbalanced at idle?

It's a 90 degree V6, which is imbalanced even with fudges like offset crankpins and is why it idles like a three-pot and the steering column does vibrate in harmony, especially when cold.

I find it rather an endearing characteristic, its growly rather rough (for a V6) nature. The Toyota V6 in the Evora was just a bit bland.

The J35 in the Leg End has the correct 60 degree included angle and is very smooth and silky. Still has a muted growl in VTEC, though.

In NSX-Ts, it's even more pronounced.