towns_trevor1989

Hi i have a 91 jeep cherokee Its doesnt get spark or power to the fuel pump. Every once in a while the fuel pump will turn on then it will have spark and run fine i was told it might be the pcm but no t sure it you have any answer i need help

H8PVMT

did you check all your grounds and the PCM connectors to see if they are shot?

freegdr

cps wires maybe wiggle them

peep

Had lead wires down to the CrankPosSensor fried by the exhaust on a jeep couple years back, go with checking the connections and look at the wires condition too. Just so I understand correctly, you describe no fuel pump power and no ignition spark at the same time, right?

tjwalker

This does sound like a problem with the crankshaft position sensor circuit.

For an intermittent issue like this, I would start by removing the connector to the crank sensor at the bellhousing, where it is located. Get a can of electronic contact cleaner (available everywhere for about $4.00). Thoroughly spray and clean the connector with that cleaner. Then add a small dab of dielectric grease (important) and reconnect.

The crank sensor connectors are subject to some debris getting inside and debris equals resistance path and that can create electrical gremlins.

Good place to start..........

towns_trevor1989

Yeah it has no spark and no power to the fuel pump i will check the cps out and the wiring and let you know what that looks like thanks