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Old 08-06-2009, 07:36 PM   #1
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1990 YJ won't start

I have a few questions so bear with me. I've had this Jeep for ten years now and have had just no problems with it except latley it started to flood. I was sitting in my driveway (thank you) and it just quit running. I head a little click in the engine compartment just before it died. It has not started sence. The timing chain is working. I replaced the fuel regulator and the injector. It seems to getting fuel because I can see it sitting in the intake manifold thru the throttle plate after cranking. I tried starter fluid. It has spark. I can hear the fuel pump come on when the key is turned on as I always have and then shuts off after a few seconds, like it always has. When I crank it it almost seems like it's flooded but will not start even if I open the throttle and let it dry out. My questions are.. Can a fuel pump deliver too much fuel if it's getting worn out? Is there some sort of relay that governs the fuel injector? My impression is this is a non computerized model but I see two what look like diagnostic nodes next to the battery. Also two relays just below them. My big question is should I just replace the fuel pump and see what happens? Thanks for any help .... Richard

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Old 08-06-2009, 08:04 PM   #2
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Join Date: Jul 2009
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I am new to the new breed of jeeps but I had a diff make rig and had that pop with the same results.....it was my fuseable link... don't know if the jeep has the same set up or not, just giving ya something to check that might be overlooked...Joey

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Old 08-06-2009, 08:41 PM   #3
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Location: Factoryville, PA
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Another thing to check out might be, sad to say, the ECU. I had a problem with mine that was similar. I could crank it as much as I wanted, but there was no spark. replaced ignition coil and CPS, nothing. Eventually, i started hearing a little click. Along with that little click, two of the four lights that are supposed to come on would go off. (Seatbelt, check engine, brake, and one other light...forget what. And forget the two that went off with the relay) sometimes it would start with the old ecu after I cleaned it, if it connected right, and then I would hear the relay click off when it didn't. Check the CPS anyway, it's a cheep fix...and see if you have power going into the coil. When my ECU went bad, I had power going into the coil, but none coming out of it, because of the relay going off when something was wrong
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