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Old 07-13-2011, 01:39 PM   #1 (permalink)
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Starting problem

I have a 94 YJ, 4.6 stroker, stock computer with mustang injectors. I just did an inframe rebuild along with some other repairs. When I go to start it after it sits, I have to crank on it for 1-3 minutes before it starts. It runs great when I get it going. Checked fuel, its ok, but no spark. I checked codes, I have 21, 22,23,24,25, 33,35. None of these codes affect spark. I just installed a new cam sensor in the distributor and CPS. Did not fix the problem. Coil ohms out good per the FSM. PCM was overhauld 2 years ago by the group in florida. Getting real fustrated. Any help would be appreciated.
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Old 07-14-2011, 05:24 AM   #2 (permalink)
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If I understand correctly you have spark at coil but not at the plugs?
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Old 07-14-2011, 08:44 AM   #3 (permalink)
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I have 12v to the coil but its not switching the ground to make spark. Tim
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Old 07-14-2011, 09:43 AM   #4 (permalink)
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If you have current going to the coil but no spark could it be as simple as a bad coil? Or possibly a sensor or relay not letting it work? Just trying to help. But if you have current to it, nothing coming out of it it would seem to be the coil or something attached to it?
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Old 07-14-2011, 02:02 PM   #5 (permalink)
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I ohmed the coil, checked good! I have 12vdc to it. for a coil to work the ground terminal is what causes the spark. The computer is what turns the ground on and off like the points in a distributor. I already changed the cam and crank sensors. I disconnected the computer and reconnected it. Is is starting better. I am going to clean the contacts on the computer and put on some Dow Corning DC4 compound to reinsulate the connector. Tim

Last edited by astjp2; 07-14-2011 at 02:02 PM.
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