I can't get my Jeep to run, so I figured I'd ask the experts for some help. It's an '89 4.0/5 speed that I've owned since new, currently has 250k miles on it. It had been running kind of rough and stalling so I performed the following maintenance:
* removed & cleaned throttle body & IAC pintle.
* noticed a leaky injector o-ring, so I replaced all o-rings,
* checked all vacuum lines (all lines were replaced with OEM harness not too long ago, O2 sensor replaced 6,000 miles ago)
* installed new cap & rotor.
After getting it all back together, it cranks but won't start. I disconnected the CPS to get the fuel rail off, so I think that might be part of the problem. On a cold engine, resistance between the two CPS leads at the connector reads just under 200 ohms. My Chilton book says to check for resistance at the ignition control module between the A and B pins. Is this check supposed to be performed with the ignition on or off? I was afraid to check this with the ignition on because I thought I might fry something. With the ignition off, I measure 0 ohms between the pins at the ICM connector whether the CPS is plugged into the harness or not.
What is the proper way to verify CPS functionality? Would the simple act of unplugging it be enough to kill it? This is the original CPS, so I'll replace it if I have to - I just don't want to replace it if it isn't bad.
Any help would be appreciated.
Thanks,
Jim
* removed & cleaned throttle body & IAC pintle.
* noticed a leaky injector o-ring, so I replaced all o-rings,
* checked all vacuum lines (all lines were replaced with OEM harness not too long ago, O2 sensor replaced 6,000 miles ago)
* installed new cap & rotor.
After getting it all back together, it cranks but won't start. I disconnected the CPS to get the fuel rail off, so I think that might be part of the problem. On a cold engine, resistance between the two CPS leads at the connector reads just under 200 ohms. My Chilton book says to check for resistance at the ignition control module between the A and B pins. Is this check supposed to be performed with the ignition on or off? I was afraid to check this with the ignition on because I thought I might fry something. With the ignition off, I measure 0 ohms between the pins at the ICM connector whether the CPS is plugged into the harness or not.
What is the proper way to verify CPS functionality? Would the simple act of unplugging it be enough to kill it? This is the original CPS, so I'll replace it if I have to - I just don't want to replace it if it isn't bad.
Any help would be appreciated.
Thanks,
Jim