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Lets say there is a substantial imbalance in compression values between cylinders, whats a reasonable course of action? What would be considered substantial imbalance. I assume no OM617 out there - unless meticulously maintained would have exactly equal compression on all cylinders, right?
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I've heard a variance of 10% is acceptable. If you have more, there may be nothing wrong with the car and it and the engine may still have a long life ahead of it, but you may not be able to get the idle where you want it. I think in general, the course of action would be to live with it unless you want to throw a substantial amount of money on making the perfect idle.
Dkr.