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4.2L detonation

For all non stroker / performance related problems and discussion.
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Posts: 4
Joined: December 9th, 2016, 11:10 am
Vehicle Year: 1987
Vehicle Make: Jeep
Vehicle Model: Wrangler

4.2L detonation

Post by Trevordavis0521 » February 20th, 2017, 7:52 pm

I have a summit HEI distributer in my 87 wrangler w/ the 258 4.2L and it is detonating under load from 2200 RPMs+
I have turned the vacuum advance alll the way down and brought the timing down to 8 degrees and I still have problems. I wrote the timing down for every 500 RPMs. I've actually brought the timing down to 6 degrees since I've wrote them down and I still have problems. Any feed back would be great. The table I made is in order from RPMS|mechanical advance only|W/ vacuum advance|degrees vacuum advance adds to mechanical
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