aarong
NAXJA Forum User
- Location
- Robie Creek, ID
I did a search and couldn't find an answer. I have a 89 XJ 4.0, I have been trying to nail down this intermittent starting problem that I have. It starts, runs until you release the key, then dies. Occasionally it will continue to run. I was doing some trouble shooting today on it. One thing I noticed is that the fuel pump will buzz sometimes when I turn the key to the on position, sometimes there is no buzz. I know that the fuel pump runs for a few seconds when turning the key on, if the engine doesn't start the pump shuts off.
My question is: should the pump engergize (buzz) with every attempt to start?? Or does the computer sense that there is enough fuel pressure and doesn't trigger the pump to energize occasionally??
I don't remember if I heard the pump energizing everytime that I turned the key to the on position before my start/stall condition appeared.
I also checked the voltage at the pump connector, when cranking the engine I was getting 0.40 volts, once the engine caught I was reading 12 volts at the pump. I have tried swapping out the relays but that doesn't seem to help. I also recently replaced the IAC and the problem persists.
My question is: should the pump engergize (buzz) with every attempt to start?? Or does the computer sense that there is enough fuel pressure and doesn't trigger the pump to energize occasionally??
I don't remember if I heard the pump energizing everytime that I turned the key to the on position before my start/stall condition appeared.
I also checked the voltage at the pump connector, when cranking the engine I was getting 0.40 volts, once the engine caught I was reading 12 volts at the pump. I have tried swapping out the relays but that doesn't seem to help. I also recently replaced the IAC and the problem persists.