OK - here goes again...
A few weeks ago, I go to start my Jeep and it cranks and cranks but won't start. No CEL, no error codes, yet it won't start. I moved it, facing downhill, and the next day it starts but only runs for a few minutes and dies. Restart and it runs for 10-20 seconds and dies. It will die when your driving down the road at 40mph or just sitting at idle.
I replaced the ASD relay (starts, runs, dies).
I replaced the fuel strainer (starts, runs, dies, runs, dies, runs, dies....)
My Jeep has the PITA(!) all-in-one fuel pump module on top of the tank. Thanks to the post on JEEPFORUM on dropping the gas tank! After replacing the strainer, I even hooked up a hose from the pump outlet to the return line and ran the pump (in the tank) for two minutes before re-installing everything.
So, for some reason, the Jeep is still deciding to shut things down. HELP!
I've also checked the following:
Coolant sensor - unplug and aux fan kicks on, engine still runs, get CEL and error code for open circuit.
Intake Air Temp - unplug and no effect, engine still runs, get CEL and error code for open circuit
Idle Air Controller - unplug and no effect, engine still runs, no error code.
TPS - unplug and engine surges once, get CEL and error codes for high and low open circuit.
MAP - unplug and engine surges up and down, get CEL and error code for open circuit.
Before I go and spend $250 on a new pump module, is there anything else that could be causing this problem? (starts, runs, dies, gets progressively worse, give it a few hours or a day and it does it all over again) If it was insufficient fuel, would it just totally cut out like that. And then when I go to restart, there is no voltage to the injectors. If its not fuel starvation, then something is "tripping" and then eventually resets.
Some specific questions:
Fuel pressure - is there a fuel pressure sensor? They don't show one in the Chiltons manual and I couldn't find one.
CPS - how do you get to it and can it be removed without dropping the engine?
Ballast resistor - where is it on the 2000 model year?
Fuel pump - anything else that be causing this problem?
Thanks in advance for any help/suggestions.
A few weeks ago, I go to start my Jeep and it cranks and cranks but won't start. No CEL, no error codes, yet it won't start. I moved it, facing downhill, and the next day it starts but only runs for a few minutes and dies. Restart and it runs for 10-20 seconds and dies. It will die when your driving down the road at 40mph or just sitting at idle.
I replaced the ASD relay (starts, runs, dies).
I replaced the fuel strainer (starts, runs, dies, runs, dies, runs, dies....)
My Jeep has the PITA(!) all-in-one fuel pump module on top of the tank. Thanks to the post on JEEPFORUM on dropping the gas tank! After replacing the strainer, I even hooked up a hose from the pump outlet to the return line and ran the pump (in the tank) for two minutes before re-installing everything.
So, for some reason, the Jeep is still deciding to shut things down. HELP!
I've also checked the following:
Coolant sensor - unplug and aux fan kicks on, engine still runs, get CEL and error code for open circuit.
Intake Air Temp - unplug and no effect, engine still runs, get CEL and error code for open circuit
Idle Air Controller - unplug and no effect, engine still runs, no error code.
TPS - unplug and engine surges once, get CEL and error codes for high and low open circuit.
MAP - unplug and engine surges up and down, get CEL and error code for open circuit.
Before I go and spend $250 on a new pump module, is there anything else that could be causing this problem? (starts, runs, dies, gets progressively worse, give it a few hours or a day and it does it all over again) If it was insufficient fuel, would it just totally cut out like that. And then when I go to restart, there is no voltage to the injectors. If its not fuel starvation, then something is "tripping" and then eventually resets.
Some specific questions:
Fuel pressure - is there a fuel pressure sensor? They don't show one in the Chiltons manual and I couldn't find one.
CPS - how do you get to it and can it be removed without dropping the engine?
Ballast resistor - where is it on the 2000 model year?
Fuel pump - anything else that be causing this problem?
Thanks in advance for any help/suggestions.