I have an Isuzu tech training course for these engines and this is what it says-
Problem- Engine has a vibration at above idle.
Possible cause- Outer ring on the harmonic damper has moved.
Diagnosis- Look for abnormal harmonic damper oscillations. During a visual inspection, check to see if the inner damper spring is also damaged.
I checked the parts catalog and repair manual and can't find any info on the damper/balancer.
I don't believe it's normal for this engine to vibrate at all. In over ten years on the Vehicross forums this is the first time I've heard about any engine vibration. Mine is so smooth with 218,000 miles and at 80 mph my whole vehicle doesn't have even the slightest vibration.
Engine vibration on this 3.5L should be something that can be corrected, IF the problem can be found.
Mark Griffin
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