willtheone2
NAXJA Forum User
- Location
- Rochester NY
Hello folks, first time posting, but a longtime 
lurker.
I've got a 92 XJ 4.0 that I'm having some trouble with that I'm hoping someone might have some ideas about. I've seen lots of comments about people not putting enough info in their posts, so bear with me, I'm going to try to include everything that may be relevent.
Jeep's been running strong, until I parked her for a week. I blew up a u-joint between my adams shaft and rear yoke, which messed up both my slip shaft and yoke. Was parked for a week while waiting for parts. I'm a dummy and apparently haven't been greasing the slip shaft enough, so really had to go crazy with a big ole hammer to get it off. Probably should have removed the shaft from the t-case first, but oh well. Anyway how this may relate to my problem, is it put some real vibrations through the drivetrain for the 2,5 hours of hammering that it took to get the darn thing off.
Finally get everything under the car buttoned up, go to start her to go on a test drive, and battery was dead. Threw a jump box on, and now she just cranks. Doesnt stutter or hic-up, or do anything to indicate that it even wants to start. Checked spark first to see if the CPS was working, and I do have spark. Its maybe not the hot blue spark that people seem to want to see, but seems similar to the spark I've seen when the car was actually running fine. Replaced the coil anyways, and made no difference. The fuel pump does turn on with ignition, and I'm getting around 43-44 psi at the fuel rail. The pressure does drop pretty quickly after the pump turns off or after I stop cranking. It'll go down to around 20 psi in about 5 seconds, then slows down, and will drop to zero around 2 minutes later. I would think that I have adequate pressure while cranking to get the engine to at least try to start, but I may be wrong. I checked continuity at the fuel pump ballast thing at the recommendation of a buddy, and it seemed fine. Made a jumper to bypass it to make sure, and no difference.
So in my mind, I have spark and fuel pressure at the rail, so I unplugged an injector to see if I was getting power. I was, and observed the - side pulsing when I cranked on it, which I believe is correct. Heres where things get weird. With the one injector unplugged, and me cranking on it, suddenly the engine is starting to hic- up like it wants to run. I plugged the injector back in, and boom, back to just cranking with no sign of life. Unplugged another injector, and it starts hic- upping while cranking again. It still wont start, but is the closest I've gotten.
I'm at a loss right now regarding where to go next. I was just going to throw a sew set of plugs, wires, and a new cap and rotor at her since its been a while, but now I'm hesitant to implement the shotgun approach on the ignition system if my problem is seeming fuel related.
If anyone has had similar problems and/ or has any ideas or suggestions, please help me out. Ole girl XJ is my daily and Ive been borrowing my grandmothers car to get too and from classes. You might save me from getting a beating with a cane from an old lady, which would be great for me and maybe good for you from a moral standpoint.
Thanks!
lurker.I've got a 92 XJ 4.0 that I'm having some trouble with that I'm hoping someone might have some ideas about. I've seen lots of comments about people not putting enough info in their posts, so bear with me, I'm going to try to include everything that may be relevent.
Jeep's been running strong, until I parked her for a week. I blew up a u-joint between my adams shaft and rear yoke, which messed up both my slip shaft and yoke. Was parked for a week while waiting for parts. I'm a dummy and apparently haven't been greasing the slip shaft enough, so really had to go crazy with a big ole hammer to get it off. Probably should have removed the shaft from the t-case first, but oh well. Anyway how this may relate to my problem, is it put some real vibrations through the drivetrain for the 2,5 hours of hammering that it took to get the darn thing off.
Finally get everything under the car buttoned up, go to start her to go on a test drive, and battery was dead. Threw a jump box on, and now she just cranks. Doesnt stutter or hic-up, or do anything to indicate that it even wants to start. Checked spark first to see if the CPS was working, and I do have spark. Its maybe not the hot blue spark that people seem to want to see, but seems similar to the spark I've seen when the car was actually running fine. Replaced the coil anyways, and made no difference. The fuel pump does turn on with ignition, and I'm getting around 43-44 psi at the fuel rail. The pressure does drop pretty quickly after the pump turns off or after I stop cranking. It'll go down to around 20 psi in about 5 seconds, then slows down, and will drop to zero around 2 minutes later. I would think that I have adequate pressure while cranking to get the engine to at least try to start, but I may be wrong. I checked continuity at the fuel pump ballast thing at the recommendation of a buddy, and it seemed fine. Made a jumper to bypass it to make sure, and no difference.
So in my mind, I have spark and fuel pressure at the rail, so I unplugged an injector to see if I was getting power. I was, and observed the - side pulsing when I cranked on it, which I believe is correct. Heres where things get weird. With the one injector unplugged, and me cranking on it, suddenly the engine is starting to hic- up like it wants to run. I plugged the injector back in, and boom, back to just cranking with no sign of life. Unplugged another injector, and it starts hic- upping while cranking again. It still wont start, but is the closest I've gotten.
I'm at a loss right now regarding where to go next. I was just going to throw a sew set of plugs, wires, and a new cap and rotor at her since its been a while, but now I'm hesitant to implement the shotgun approach on the ignition system if my problem is seeming fuel related.
If anyone has had similar problems and/ or has any ideas or suggestions, please help me out. Ole girl XJ is my daily and Ive been borrowing my grandmothers car to get too and from classes. You might save me from getting a beating with a cane from an old lady, which would be great for me and maybe good for you from a moral standpoint.
Thanks!
