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Rough idle

S

Sniper82

Lifer
What would cause a car to vibrate quite a bit sitting at idle but is fine while driving? I tried changing fuel filter,oxygen sensor and plugs with no luck. Its a 96 Geo Prizm.
 
auto or manual?

if its an auto, put it into neutral and see if that helps.

likely engine mounts though
 
What's the idle speed (RPM)? It could be worn engine mounts. I don't think that the 1.6 and 1.8 litre engines used in the Prism had balance shafts, and 4-cylinder engines are inherently vibration prone. It's fairly typical for small 4-cylinders to vibrate at idle and smooth out a bit once under way.

ZV
 
Originally posted by: Sniper82
What would cause a car to vibrate quite a bit sitting at idle but is fine while driving? I tried changing fuel filter,oxygen sensor and plugs with no luck. Its a 96 Geo Prizm.
Click to expand...

If it just started to become noticeable you may have developed a vacuum leak.
 
It wasn't as bad when I got the car about 4 months ago. Its auto and putting it in neutral does help some but not much. Idle speed is around 2k when first starting it but after it warms up it drops to around 1k.

Of course it doesn't vibrate much when first started.
 
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