Thread: 289 idle
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Old 01-01-1970, 12:00 AM   #5
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Default Re: 289 idle - follow-up







Fred/Sam/JD,



Thanks for the help so far. I had run a compression test using a mechanical gauge that screws into the plug holes and found them all to be 140 psi to 145 psi so that is not the problem. Vacuum test shows 15 inches of mercury and “wiggle“ is plus or minus one inch. Does this sound reasonable? When I said I thought a valve might be hanging open I should have said a lifter might be sticking and holding the valve open. This is just a guess but I am running out of guesses. There is plenty of oil getting to the rockers. Changing the timing and adjusting the carb doesn’t seem to smooth it out. I assume it is not an inaccurate cam since the problem is not always there, only about half of the time when I pull up to a stop. On the plus side it runs great under power. I will keep posting as it evolves.



Charlie Stephens