I have an 88 Jeep Wrangler with a 4.2l engine. It has the nutter-by-pass and the Team Rush ignition upgrade. The problem is it wont run. Whne you try to start it it fires right up but as soon as you release the key to the run position it shuts off. We did some checking and found that the spark dies when the key is in the run position. So what causes this. I know that someone has to have had this problem before, where can I start looking to see what the problem is? Thanks for your help.

Kris

I do the same thing every weekend, its just the location where I do it that changes!

The key switches the supply voltage to the coil from a full 12 volts to about 8.7 (or so) volts. If you're getting no voltage on RUN get out you're schematic and follow the supply voltage to the coil back through the resistor wire harness to the ingition switch. Somewhere between those points the voltage is not not being swtiched to the coil.

Do your accesaries(lights, radio, wipers,) work when the ingnition is in run, if not I would say its an ingnition switch problem.

88 YJ:4.2 I6 TR upgrade and MC2100

Good starts form the other two responces. There is also a ballast resister between the ignition swich 'run' position and the coil, it could be an actual resister, or a resistance wire. If there is no voltage avaiable at the coil when the key is just at 'run' start working your way back until you find voltage. Good luck, Scott

My Rides
1979 CJ-7: 304, 3spd, much is my rebuild
1983 CJ-7: 258, 5spd, for Peru Excursion
1989 XJ: has seen every state except Hawaii

In search of lost paths and distant locations...

All of the accessories work when the key is in the on position. I will check the coil with the key in the two different positions and see what I can find out. Thanks for your help I will keep you updated. Any other ideas would be greatly appreciated.

Kris

I do the same thing every weekend, its just the location where I do it that changes!