Well here we go again...
A few weeks ago I had a crank/no start (and then intermittent stalling, it started up the next day) issue that I resolved by replacing the TPS (aftermarket then OEM, learned that lesson...), the spark plugs, and cleaning up some ground leads. I also cleaned up and tested the clockspring (yes, I was super careful to make sure it was turned properly) and did a bit of rewiring to some of the sensor grounds, cause when I looked at the wiring, what was there was pretty ratty. Not sure any one of those did it, but it fired up and ran okay for a few weeks, occasionally would have a stall at a red light or stop sign when idling, but it would fire right back up with no issues. I was never able to recreate the stalls by wiggling or playing with any of the wiring anywhere. Here's the Original Thread.
Today, I was driving it down a dirt road and it cut out again, this time it was in gear and with my foot on the gas. Wasn't able to start it up at all. Starter fluid didn't help. I checked the fuel pressure and it was at 44 psi, checked compression and it was good (all between 130 and 150 psi) in all cylinders, I haven't gotten any codes, and the battery voltage is good. I'm kind of lost on what to check next, but I don't really want to go to a shop cause I made the decision that I was gonna learn and fix everything that happened with this Jeep and I don't give up that easy. (and it's a holiday weekend, so not sure many would be open anyways).
I tested the coil rail thing a few weeks ago by putting ohmmeter leads in the various holes and it seemed to have continuity and resistance in the right spots (don't remember which ones, but there was a youtube video I watched and it matched up). Could there be a timing issue? I would suspect CMP or CKP, but I haven't gotten any codes for either (but I did have a P1391 intermittent CMP or CKP code a few weeks ago too — hasn't come back yet). All the sensors I've checked have good 5v supply and a good ground. Pretty sure there isn't an exhaust blockage, we put a few rags in the tailpipe and they shot right out while cranking (weirdly enough it would almost sputter like it was gonna start, and then it would shoot them out and quit). I'm pretty much lost at this point.
Its a 2000 TJ 4.0 Sport
TL;DR: Jeep stalled, cranks but won't start, no codes, all sensors have good supply and ground, fuel pressure and compression are good.
Also I noticed the PCM is new as of 2016, looks like it's an OEM one, installed by a dealership, which suggests that someone in the past has probably had issues like this before.
Next on the list for me:
Manually checking the CKP
Manually checking the CMP
Drinking a few beers
Making sure the coil rail is actually sending electricity (pretty redneck way but if it works...)
Finding out a way to check the timing?
Any ideas anyone has would be super helpful. Once I get this fixed, it's gonna make one hell of a write-up on troubleshooting
A few weeks ago I had a crank/no start (and then intermittent stalling, it started up the next day) issue that I resolved by replacing the TPS (aftermarket then OEM, learned that lesson...), the spark plugs, and cleaning up some ground leads. I also cleaned up and tested the clockspring (yes, I was super careful to make sure it was turned properly) and did a bit of rewiring to some of the sensor grounds, cause when I looked at the wiring, what was there was pretty ratty. Not sure any one of those did it, but it fired up and ran okay for a few weeks, occasionally would have a stall at a red light or stop sign when idling, but it would fire right back up with no issues. I was never able to recreate the stalls by wiggling or playing with any of the wiring anywhere. Here's the Original Thread.
Today, I was driving it down a dirt road and it cut out again, this time it was in gear and with my foot on the gas. Wasn't able to start it up at all. Starter fluid didn't help. I checked the fuel pressure and it was at 44 psi, checked compression and it was good (all between 130 and 150 psi) in all cylinders, I haven't gotten any codes, and the battery voltage is good. I'm kind of lost on what to check next, but I don't really want to go to a shop cause I made the decision that I was gonna learn and fix everything that happened with this Jeep and I don't give up that easy. (and it's a holiday weekend, so not sure many would be open anyways).
I tested the coil rail thing a few weeks ago by putting ohmmeter leads in the various holes and it seemed to have continuity and resistance in the right spots (don't remember which ones, but there was a youtube video I watched and it matched up). Could there be a timing issue? I would suspect CMP or CKP, but I haven't gotten any codes for either (but I did have a P1391 intermittent CMP or CKP code a few weeks ago too — hasn't come back yet). All the sensors I've checked have good 5v supply and a good ground. Pretty sure there isn't an exhaust blockage, we put a few rags in the tailpipe and they shot right out while cranking (weirdly enough it would almost sputter like it was gonna start, and then it would shoot them out and quit). I'm pretty much lost at this point.
Its a 2000 TJ 4.0 Sport
TL;DR: Jeep stalled, cranks but won't start, no codes, all sensors have good supply and ground, fuel pressure and compression are good.
Also I noticed the PCM is new as of 2016, looks like it's an OEM one, installed by a dealership, which suggests that someone in the past has probably had issues like this before.
Next on the list for me:
Manually checking the CKP
Manually checking the CMP
Drinking a few beers
Making sure the coil rail is actually sending electricity (pretty redneck way but if it works...)
Finding out a way to check the timing?
Any ideas anyone has would be super helpful. Once I get this fixed, it's gonna make one hell of a write-up on troubleshooting
