i have a 1987 xj 4.0 auto my problem i turn the key engine starts and dies as soon as i let off the key i i hold it in the starting position it will run but ass soon a i let off it dies i have replaced the ballast resistor and the gnition switch i have been told to go through mt nutrel saftey switch but dont know if that would cause my problem please help!!!:rattle:
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engine wont stay running
- Thread starter kcclark
- Start date
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Most likely the fuel pump relay is bad.
Key ON, you get a 3-second "prime" of the fuel pump from the B Latch relay, then it is cut off by the ECU.
Key START the fuel pump gets power from the starter relay.
Key ON, engine running from idle to just short of WOT the fuel pump gets its power from the fuel pump relay.
Key ON, engine at WOT, fuel pump power is from the oxygen heater relay.
Check the fuel pump relay.
Key ON, you get a 3-second "prime" of the fuel pump from the B Latch relay, then it is cut off by the ECU.
Key START the fuel pump gets power from the starter relay.
Key ON, engine running from idle to just short of WOT the fuel pump gets its power from the fuel pump relay.
Key ON, engine at WOT, fuel pump power is from the oxygen heater relay.
Check the fuel pump relay.
winterbeater
NAXJA Forum User
- Location
- Royal Oak, Michigan
NSS doesn't have any thing to do with it. That would just prevent the starter from working.
You can swap relays from other funtions to test the fuel pump relay.
You can swap relays from other funtions to test the fuel pump relay.
joe_peters
NAXJA Forum User
- Location
- Grants Pass, OryGun
Well, check the adjustment of the ignition switch at the foot of the steering column, it is possible that when you return the key to the ON position the ignition switch is hitting OFF.
ruger81
NAXJA Forum User
- Location
- Battle Ground WA
check all the vacume hoses around the air box. also the map sensor on the fire wall.. and there is another vacume switch of some sort on the drivers fender behind the air box
No factory alarm on an '87 that I know of.
Try bypassing the ballast resistor. It's bypassed on START but reduces the voltage to the FP in RUN to quiet it down a bit. You can simply connect the 2 wires together and see if it continues running.
That and Joe's suggestion on the IGN switch.
Try bypassing the ballast resistor. It's bypassed on START but reduces the voltage to the FP in RUN to quiet it down a bit. You can simply connect the 2 wires together and see if it continues running.
That and Joe's suggestion on the IGN switch.
ruger81
NAXJA Forum User
- Location
- Battle Ground WA
if it has one try locking all the doors and then opening it from the fornt passenger door un lock all the doors from that door assuming that its pwr locks.....
