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91 comanche problem

have this problem with my 91 comanche 2.5L. The engine rotates but will not start. I hooked up a spark tester and noticed no spark from any line and replaced ignition coil, but still no spark. The book says that it could be The ECU (engine control unit)since there is no control moduale on my year. My question is, where is this ECU located and bout how much will it cost me to replace it? I also notice on the key on, key off code retriever does not work anymore. It also mentions that the ECU and PCM are one and the same. Will appreciate any advice.

Edwin T.

Reply to
E.T.
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Ok, did some searching on google groups for older news posts and came up with problems pertaining to the Auto shutdown relay. It seems somewhat similar. I pulled pump out cause I couldnt hear it when the key turned thinking it was a bad pump, but I tested it on the battery and the fuel pump worked. Then tested for spark. None whatsoever, replaced coil, still the same. How does one test the ASD relay? And.....bout how much does one cost?

Ed

Reply to
E.T.

That could be a dead body ground disconnecting the computer from the engine. It is a wire mesh cable that runs from the rear of the head to the firewall.

I test them by using a booster cable hooked from the battery negative to the firewall to see if it starts up.

The ECU is inside the distributor.

Mike

86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00 88 Cherokee 235 BFG AT's

"E.T." wrote:

Reply to
Mike Romain

I checked that mesh cable and it looks ok. Full conection no breaks or loose at all. But did like you mentioned and used a booster cable to the negative on the battery and hooked it up to firewall where the mesh cable is and started it up but still no start.Thanks for the info though.

Reply to
E.T.

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