MOPAR MPFI kit question - Page 2 -
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post #16 of 17 Old 05-29-2008, 07:24 PM
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Join Date: May 2008
Location: Okinawa, Japan
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I have the Mopar MPI and have been experimenting with 87 and 91 octane because I have ping/detonation under acceleration (I haven't found a station selling 92/93 yet). I notice no difference in the performance of the Jeep with either octane, and the ping/detonation occurs with both. Other than the timing, are there any other fixes out there for ping/detonation under acceleration with the MPI kit? Any info is good info...thanks.

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post #17 of 17 Old 05-30-2008, 09:27 AM
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1983 CJ7 
Join Date: May 2008
Location: Hernando, MS
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Just joined the forum... but I have an '83 CJ-7 with the MPFI kit on it also. I run 93 in it. I think it has something to do with the timing. I'm not really sure.

But I have run 87 in it before for a long while and it ran just fine then also. I can tell no difference from when I ran 87 and now, when I am running 93. Hope that helps.

I just run 93 in it now because it's not my daily driver and I MIGHT go through 1 to 2 tanks of gas in a month,and I'd rather not find out the hard way, moneywise, that I should have run 93.
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