MechanicalType
NAXJA Forum User
- Location
- TN
First time poster, first time XJ owner. Jeep won't start. Cranks all day, shows only code 12 and 33. Fuel pump kicks on for about 1/2 second when ignition is keyed on, Schrader valve releases decent fuel pressure. Unplugged MAP sensor, checked ASD relay, checked fuel pump relay. I understand the ASD is switched to ground.
Fuel pump relay has power to all 3 prongs, 4th prong (green/white) gets battery voltage when cranking. You can unplug the crank sensor and plug it back in w/ key on engine off and hear the pressure build in the fuel feed line. Crank the key and it's pumping fuel, distributor is getting spark.
I can get the engine running with a very small spritz of ether and it will sit and run until I shut it off. I've cranked it with the fuel line in a jug and it pumps plenty of fuel. I tried swapping out the crank sensor (compared resistance of old and new and barely any difference) installed it anyways, still no luck. spritzed a bit of ether, pedal to the floor, fired up and has been idling and revving to 3500rpm w/out any sputter or misfire.
Anyone have an idea? At first I thought it was sucking air, but it seems to have plenty of fuel w/out aeration when cranking. Possibly a MAF or tps sensor? Anyone have any idea how to test them?
Note: Ether is bad, mmkay..
Note: yes, I know ether bad, but it's was just a one time thing.. Guess I've been a diesel mechanic too long.
Thanks in advance,
Mechanicaltype
Fuel pump relay has power to all 3 prongs, 4th prong (green/white) gets battery voltage when cranking. You can unplug the crank sensor and plug it back in w/ key on engine off and hear the pressure build in the fuel feed line. Crank the key and it's pumping fuel, distributor is getting spark.
I can get the engine running with a very small spritz of ether and it will sit and run until I shut it off. I've cranked it with the fuel line in a jug and it pumps plenty of fuel. I tried swapping out the crank sensor (compared resistance of old and new and barely any difference) installed it anyways, still no luck. spritzed a bit of ether, pedal to the floor, fired up and has been idling and revving to 3500rpm w/out any sputter or misfire.
Anyone have an idea? At first I thought it was sucking air, but it seems to have plenty of fuel w/out aeration when cranking. Possibly a MAF or tps sensor? Anyone have any idea how to test them?
Note: Ether is bad, mmkay..
Note: yes, I know ether bad, but it's was just a one time thing.. Guess I've been a diesel mechanic too long.
Thanks in advance,
Mechanicaltype