tprman Posted March 16, 2015 Posted March 16, 2015 Have a little tech question. I have a 1988 MJ 4.0 automatic. I was driving down the road and it shut off. I let it set for a little while and it would start back up and run for about 20 mins and it would shut off again. I change the coil and coil wire and it still does it. Any ideas what's going on with it.
boardmanMJ Posted March 16, 2015 Posted March 16, 2015 I have the same problem with my 88. Cruiser posted some excellent tips (with pictures too) and I'm going to start diagnosing it today.
yxmj Posted March 16, 2015 Posted March 16, 2015 CPS..................it will work till it heats up the stop till it cools down
shelbyluvv Posted March 16, 2015 Posted March 16, 2015 Mine was the fuel pump ballast getting hot and killing the pump.
tprman Posted March 17, 2015 Author Posted March 17, 2015 Well I put a new CPS on it today. Now the MJ started skipping and back firing when I give it gas. Also I put a new fuel filter.
onlyinajeep726 Posted March 17, 2015 Posted March 17, 2015 Bypass the fuel pump ballast and if that doesn't help, your fuel pump might be going out.
Steve Gregory Posted March 18, 2015 Posted March 18, 2015 It very well could the the fuel pump, when mine went out, it was intermittent. But, all Jeeps are different!
cruiser54 Posted March 18, 2015 Posted March 18, 2015 Good advice here. My Tips are in the link below just so ya know.....
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