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1994 YJ No Spark Jeep Registry
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1994 YJ No Spark

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cgedge
Registered User

Jeep Information

Year:1994

Model:YJ Wrangler

Engine:2.5L

Suspension:4" Rubicon Express


This is going to be a little long as I am going to try and be descriptive as possible.
My brother and I had just finished putting on my lift kit and took the Jeep for a spin to see how it rode. Got back and had to change a some fuses to get my brake lights working. The engine was still warm when I went to start it again. The engine was turning over but not starting. We checked and found there was no spark. After messing around for a minute we swapped around relays thinking the Auto Shutdown relay might had went out on us. It started up after that and I claimed an early victory. However, once we started it, took it for a spin and returned, while the engine was still warm, it would not restart. Same problem no spark. Fast forward.
-Still no spark at plugs or distributer.
-Have fuel.
-No indicators
-No Advisory lights when turning the ignition on.
-We changed the Crankshaft Position Sensor, No luck.
-Reset the ECM by disconnecting the battery for 5 minutes. It worked, got my indicator and advisory lights back. Took it for a drive, hit a bump and lost all indicators. Got back, tried reseting the ECM again, no joy.
-Still not sure but I believe it is a temperature related problem.
-Noticed there were some fuse receptacles on the box by the pedals that appeared to have burnt out. Looks like I will have to replace those. Not sure electrically if that box would have any play into my problem with no spark.
-Did the wiggle check on wiring but couldn't get indications of a short. Not looking forward to metering out the wiring.

I am not a mechanic by any means. Most of the info I get is from this forum. This is my first Jeep so if you have an answer please be specific as I may have no clue what you are talking about. Thanks for any help and if you have any questions let me know.

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munden
Registered User
View munden's Jeep
07-30-2012, 03:57 PM
Did the doom light fuse blow it power the ECM I had wires rubbed and shorting out check wire under hood back fire wall at map sensor



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