Iv been having a problem with my jeep that I cant seem to figure out what the cause is. I could really use some help trouble shooting the problem as my jeep is my daily driver and only transportation to work.
Ill start off by saying I have a 1987 4.2 cylinder 4x4 5 speed jeep wrangler, it is carbureted. And is stock. ive recently replaced my spark plugs, spark plug wires, fuel filter, rotor, distributor cap.
now for the problem, last weekend I went wheeling in the jeep and went through a small mud whole. After i got out of the whole my jeep just stopped running, got out messed with it a lil and got it running but I had to keep my foot on the gas to keep it running. When I got home I took the distributor cap off and dried out the water, and I unplugged my ICM and blew out the connectors with a compressor started the jeep and it ran fine besides idling at 2000 rpms instead of about 700-800 rpms.
The next day i washed my engine out lightly with a hose. Since then my jeep has acted up worse.
if it has been sitting for 6+ hours I can start it with no problem and it will idle but rough for about 5 min then die. If im driving I have the keep the gas pedal pressed to keep it idling and you can feel the rough idle and while driving(almost like a misfire).
I have a feeling my ICM is bad, but I dont know and nobody I have talked to knows what it could be, most think its a fuel problem, but I know for a fact that is something electrical.
If anyone has any suggestions that might help please tell me.
Best course is to put it on an engine analyzer and see what is happening. Idle above normal is either mechanical problem associated with accelerator cable, or wet connections to the sol-vac. These are what set the idle speed on that motor.
ALL these motors should have a dedicated ground for the ICM, none had this from the factory. The black wire in the 3 wire harness on the dizzy is the wire you need to ground.
Your vehicle is more than 25 years old, when was the last time you cleaned and re-bonded the grounds associated with the engine, frame, and body? Also, if it ran better after cleaning the dizzy cap, replace the cap and rotor. They will track up with carbon and you can't really get them totally clean once they have given trouble.
418 miles on 19 gallons of gas. Can't beat the BBD !
Hey Old 4X! You don't think getting rid of the computer controlled crap is a good idea? The nutter makes you reground the distributor and the ICM as part of the mod. The rotor trick is to use nail polish on it all the way on the end to prevent arc over. I would replace the ICM as well. They are cheap enough. The best solution is if you are going to run it in mud do the Nutter and get rid of all the emissions control stuff, clean and coat all the connectors under the hood that are left(Which will be very few) with dielectric grease. Clean all the bigger cables like Old 4X said and coat those with a light coat of bearing grease. Get rid of the ICM and look at getting a good HEI system or doing the team rush mod.
Thank you, I will look into the nutter, or team rush mod. And I am looking for a ICM online to replace. If the ICM replacement doesn't fix my problem I will post back to see what my next step to finding my problem is.
I've checked my dizzy and rotor and there is no carbon or and condensation in it.
So I have replaced the dizzy, rotor, air filter, and ICM and it has not changed a thing. It's still having the same problem and I'm out of ideas of what it could be!!
Does anyone have anymore suggestions on what to do?