Join Date: Apr 1999
Location: Justin,Texas, Republic of TEXAS (USA)
Feedback Score: 0 reviews
Let's talk vibration. Cylinder misfire or low cylinder contribution is a vibration at idle that you could count out loud like, "that, that, that, that", There is a resonance (fast vibration) from crank slowing on a compression stroke and crank acceleration from firing a cylinder. This lesser amplitude vibe is much faster, more like some electric vibrator they might use on muscles, etc. The resonance vibe is very sensitive to RPM and the PCM controlling idle speed and changing it 25 RPM might put it in and out of the sensible vibration range, especially if motor mounts are settled from aged rubber, exhaust is missing hangers or stressing hangers, and if it is a manual tras the wear of damping springs in clutch disc (you don't mention whether auto or manual trans).
If the vibe is occurring does it go away if you just barely raise engine speed by very light throttle pedal press?
SO what kind of vibration is it?
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