Re: Octane requirement

Posted by MarkB_MI on May 08, 2005 at 19:29:12 from (64.31.11.115):

In Reply to: Octane requirement posted by RandyR on May 08, 2005 at 17:46:59:

As Jerry said, knocking on old engines is usually caused by carbon buildup in the combustion chamber. Another sign of carbon buildup is "dieseling" during shutdown, although fuel injection has made that a thing of the past. Some fuel additives claim to remove carbon, it's worth a try.

I have heard of mechanics removing combustion chamber carbon by squirting a little water down the intake while the engine is at a fast idle. I have not tried it myself. There is a danger of damaging the engine if you overdo it.

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