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post #1 of 5 Old 07-15-2018, 08:50 PM Thread Starter
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Diablo help

Does anybody know who in the NY/NJ area can still tune or look at a Diablo chip? I can also send computer out if that is an option. I have a 91 Mustang with a Kenne Bell s/c and a old school Diablo chip. Car starts and runs great until I turn it off. When that happens with the key on engine off the fuel pump keeps priming and I can kind of get it to start but it is a mess. I can let it sit for a day and it will run perfectly again until the key is shut off and I try to start it again. I have changed the fuel pump relay under the seat and replaced the tfi module but no good. I pulled the computer and had the capacitors replaced which were bad but still no good. My only thought is possibly the tune is corrupt. The guy who did the capacitors said the tune is protected so he could not check if it was corrupt. Any help would be appreciated as I can't drive the car because if I shut it off I can't get it back home again.


Kenne Bell s/c @ 10lbs, 30# injectors, 255 in-tank, 90mm lmaf, 4" Anderson intake, Magnaflow exhaust, Diablo tune.
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post #2 of 5 Old 07-28-2018, 09:43 AM
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have you looked at the fuel pump circuit on a wiring diagram?


89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #3 of 5 Old 08-16-2018, 04:35 PM Thread Starter
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Sorry I just saw this. I did look at the wiring diagram. Thoughts?

Kenne Bell s/c @ 10lbs, 30# injectors, 255 in-tank, 90mm lmaf, 4" Anderson intake, Magnaflow exhaust, Diablo tune.
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post #4 of 5 Old 08-16-2018, 08:21 PM
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you have two threads on this?

89 GT gr-40, KB2200(10psi), tweecer R/T,LC-1, 22gal cell, w/tailpipes.
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post #5 of 5 Old 08-16-2018, 10:19 PM Thread Starter
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Kind of. I was hoping to find a Diablo dealer with this thread who could look at my old Delta chip. Apparently the answer is nobody but I think I ruled the chip out at this point. I was trying to keep it separate so I could learn more tech from the other post. Thanks.

Kenne Bell s/c @ 10lbs, 30# injectors, 255 in-tank, 90mm lmaf, 4" Anderson intake, Magnaflow exhaust, Diablo tune.
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