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Jeep CJ 7 spits but wont run
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ejl512
New User
Jul 25, 2011, 5:54 PM
Post #1 of 7
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Jeep CJ 7 spits but wont run
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I have a 1984 Jeep CJ7 2.5 4cyl 150ci 4spd. It backfired and stop running, I got it started but it ran rough. I gave it a tune up, plugs, wires, rotor cap, I found the vacummn advance canister on the distrib was rusted and would not move so, it is new and works fine, got it going and checked the timing all good. it idled fine but I took it for a ride and it backfired again and I nursed it back to the driveway and it died with a spit and a hiss of fuel from the carb. Now it will not start, it turns over but backfires out the tail pipe and into the carb spitting fuel at the very end. I replaced the Ign Modual, fuel pump, fuel filter, and rebuilt the re-man carb, but it still wont run. What am I missing? Did my carb just die? Is my ECM computer fried? or is my Distrib toast? Can someone provide some good direction that could lead me to making my baby work. Thanks EJ
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 25, 2011, 6:22 PM
Post #2 of 7
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Re: Jeep CJ 7 spits but wont run
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I'd say you definitively have a ignition timing issue. You check for power to the ignition module on the RF fender and at the ignition coil on the red with white tracer wire with the ignition on? You have a 12V test lamp?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 25, 2011, 6:23 PM)
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ejl512
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Jul 25, 2011, 6:41 PM
Post #3 of 7
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Re: Jeep CJ 7 spits but wont run
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I will check power to the Ign Mod and coil as suggested. I manually checked spark at the coil and plugs and I do have spark at both. Dark now I will have to get my tester and test light and check both tomorrow. Back then. THANKS
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Discretesignals
Ultimate Carjunky
/ Moderator
Jul 25, 2011, 6:51 PM
Post #4 of 7
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Re: Jeep CJ 7 spits but wont run
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If you have spark using a spark tester, you must have power to the coil and module. The question is is the spark happening at the right time or is there some type of intermittent electrical problem to cause the coil or module to lose power? If you have a meter that has a min/max feature you might catch an intermittent power loss to the coil or mod.
Make sure your distributor didn't turn on you or the reluctor wheel inside isn't spinning on the shaft from a sheared pin.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Jul 25, 2011, 6:53 PM)
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Hammer Time
Ultimate Carjunky
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Jul 25, 2011, 6:57 PM
Post #5 of 7
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Re: Jeep CJ 7 spits but wont run
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Make sure you check for corrosion on the coil tower or any cracks in the coil.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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ejl512
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Jul 28, 2011, 5:59 PM
Post #6 of 7
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Re: Jeep CJ 7 spits but wont run
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Thanks a ton: I got out the old Muli Meter and tested both the primary and secondary OHMs of the Coil and they were both out of parameters. I removed the coil and it was an original AMC factory unit. I put a new one in and she finally started!!! I let it warm up and readjusted everything on the carb and checked the timing, all good. I still have a miss at idle and at high rpm. I think I need to replace my Magnetic Coil Pickup in the distributor and this will help. Do you agree. or where should I go from here to get this thing dialed in like it was!!. Thanks again. EJ
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Hammer Time
Ultimate Carjunky
/ Moderator
Jul 28, 2011, 6:02 PM
Post #7 of 7
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Re: Jeep CJ 7 spits but wont run
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I don't think a pick up coil has anything to do with an intermittent misfire. You need to look at plugs, wires, cap and rotor and any vacuum leaks.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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