1991 cherokee limited automatic. i have replaced TPS and cranksensor. vehicle ran yesterday after i replaced sensors, but it would hesitate on idle. then i drove around block 3 times and it stalled but started back up. when cranking and running tach needle flops around then when vehicle runs smooth again it stays steady. got in today and now wont start. i hear fuel pump cycle to prime but no start. took off fuel filter turned on key, pump cycled for 2 seconds and stopped. is this a pump issue? please help

 

1. Why did you replace those two sensors?

2. Is the crank sensor an aftermarket one? (lots of problems with those; buy this from Jeep)

 

ran better when i replaced them. a jeep mechanic told me to replace when i explained previous symtoms. yes it is an afterman one.

 

Poss the o2 sensors? You can do a flow test for fuel pressure, so that should help eliminate that question. Is it well tuned up- plugs, wires, cap, rotor, fluids.. Could also be the PCM as they can cause similar issues...

 

Also... Generally, this ain't a law, when the CPS fails, it fail completely and jeep just won't turn over...

 

what about about the pick up in distributor, would that cause issues? and how hard to change?
PCM eh? hmmm my tach was doing weird things. i wonder,

 

Pulled pick up out out of distributor and cleaned, replaced, vehicle runs awesome now. thanks for all the help