91 YJ No Spark

brandon gordon

New Member
Joined
Sep 13, 2014
Location
New Bern
Hello everyone I have a 1991 YJ 2.5 MT. I was working on it doing a tune up and cleaning some wires up under the dash where the previous owner had a rats nest. Anyways I went to take it out of the shop and it wouldn't start. I would crank and crank but not start up or even act like it would start. It has a new cap, button, plugs, wires, distributor, crank pos sensor. I have 5v ref at all sensors, I have the supply voltage, all fuses are good, the fuel pump is priming when you turn the key on, I have back probed the PCM with my snap on vantage mt2400, the crank pos sensor is pulsing as it should, the sync sensor or cam pos sensor whatever you want to call it is sending signal, all grounds are good, even the ones from the PCM, they have perfect continuity from PCM to engine or body, I have power to the coil but nothing coming out of the coil I have put three different coils on it because Hey even new ones out of the box can be bad. I'm stuck here please help. I really hope I'm not the only one having this problem or have had. I have read forums for two weeks now and tried or inspected problems others have had. Thanks in advance.
 
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