MPI and Timing Issue - revisited - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 09-21-2003, 12:38 PM
dadare
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MPI and Timing Issue - revisited

I had a post some time back regarding why my rebuilt CJ7 with the MPI kit (256 Cu. In.) runs about 20 BTDC on the timing. Should be 8-10, I am getting spark knock even with 93 octane. We all know of the issues of spark knock on the MPI kit, heads, hot plugs, and fuel pressure, etc. However, it's only logical to figure out why the advanced timing before hitting too much else. Hesco is totally clueless. This is a simple distributor setup and impossible to screw up. I understand thru the computer, you can retard timing just a bit. Only thing I can think of is if the camshaft position sensor plate inside the distributor were assembled out of proper position.

Anybody have any ideas? Need some thinkers on this one!
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post #2 of (permalink) Old 09-22-2003, 08:39 AM
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Re: MPI and Timing Issue - revisited

You may want to take your distributor out and try to move it one gear forward or back. It may not be in sink with the cam (TDC). I know that you can't adjust it once it is in the engine, but you may be able to if you remove it and turn the rotor and put it in a new location. Also, Hesco told me that if I wanted to adjust my timing, grind the little ear off the distributor and put the old 258 hold down on.
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