Thread: 100 RPM Fluctuations

This might be a totally stupid question, but I'm curious.

Are frequent fluctuations of about 100 RPMs at idle normal?

While I'm sitting in park, I noticed that my RPMs are bouncing between 700-800 RPMs the whole time. Meaning, its not holding steady on the gauge.

The car itself seems to drive fine and I recently replaced a vacuum line and cleaned the MAF sensor.

Any input is appreciated. Thanks!

not really normal no

Id say theres still a vac leak maybe or something else

how can you even notice 100 rpm fluctuations?

im sure shes estimating... when i had a vac leak, if u looked hard enough u could see the needle barley dip down and up.

okay, i didnt know these cars had a completely rock solid idle.

Originally Posted by TorqueAutoMotiv

not really normal no

Id say theres still a vac leak maybe or something else

Ah, I guess this will be my Saturday morning project. The Vac Leak Hunt.

Thank you!

Originally Posted by Bio248

okay, i didnt know these cars had a completely rock solid idle.

Not perfectly solid no but if they moved 100 rpm's up or down at idle in cali we would fail smog tests

THAT is weak sauce. even so, 100 rpm fluctuation is nothing to be worried about. a vacuum leak of that level is small. you might not even find it.

very true

Mine has always done that. Dont worry about it.

I'm more or less just worried about not passing inspection this month in NYS.

I guess I have to just try and see what happens.

just get it in for an inspection early so if you fail you have time to look. 100 rpms is something i wouldn't be too worried about