MountainRhino
NAXJA Forum User
- Location
- Harrisonburg, Va
OK guys, here we go again. i have posted and wrenched and cussed for a year now on my 91 XJ.
It started with this in Feb. 2011:
1991 XJ Sport 4.0L 4x4 AutoTrans
i am firmiliar with my truck and when it needs something critical to continue vehicles proper functions, i get it. i dont use, used parts that pertain to fuel spark or intake. situation as follows....
i install directv with my jeep....
Yesterday, i drove over 75 miles with no incident at highway speeds for the entire day. finish my last job, get in start, drove about a mile. while doing about 55mph, the engine stalls. i pull over turn the key, it starts, runs proper for a few seconds, then stalls. continued this way for 20 mins. start, stall, start, drive 100yds, stall. then i start it and when it tries to stall i feather the gas, and it recovers and just stumbles from time to time till i limp it home.
Today, it starts, idles, and drives fine. an hour into my day it dies again. i fumble with the distributor, to make sure everything is good.up until this point it has new (less than 3 month old) cap, rotor, ACCEL coil. i wiggle some of the old wires and it stumbles as if it is wanted to fire. with no luck i go to store and comeback with new wires and new distributor internal pick-up, a new fuel filter and Lucas inj cleaner (as i origianally assumed trash in fuel) fuel pump and ignition relays and fuses are fully functional. when key is turned, the fuel pump sounds as it always has. still with no results i had to get towed.
at this point this has just been an expensive form of troubleshooting, ie: replace stuff till it works.
i am out of bucks!! the next step that i can think of is Crank Position Sensor.
GURUS< ADVISE IF THE WRONG STEPS ARE BEING TAKEN.
air filter is fine
exhaust is absent of a catalytic converter
when the key is turned it no longer tries to start, but turns over STRONG
i have checked ecu grounds, battery connections and jumpers,MAP connections.
i dont know what else to do, but i feel confident that it is simple parts replacement. i am just afraid of it being something outside of my capabilities.
ANY AND ALL HELP IS APPRECIATED
................................................................................
Since i have replaced the fuel pump as well as PCM with 3 other XJ's. I gave up on trying to figure it out and sent it to the Jeep dealership for some results. after them wrenching on the thing for 3 1/2 months. they have since asked me to come pick it up. they had one answer, "Buy a new PCM" althought they said its most likely not the case. its just the only way to definitive way to rule it out. its got the required fuel pressure, its got spark, and of course...air...isnt the problem.
guys i am desperate, and i feel like i am having to make a life or death decision. after all the money put into it, it dosnt make sense to scrap it. not to mention that I absolutely would if it wasnt for the fact that i dont have new Jeep money right now. If it was just the no start i would feel better about making the decision to pull the plug. however it has a news trans, fully rebuilt front and a custom 8.8 rear, all new ignition, fuel and air systems, 5 brand new BFG KM2's and i am always looking to improve.
I am just worried that if factory trained technicians cant figure it out.....what in the world could it be. I am afraid it is the wiring harness, but jeep couldnt reinforce the thought. it is really frustrating. i would love to communicate with some of the most jeep savvy individuals. i am currently between jobs, so i am available all day. if any one wants to call me or lives in VA and wants to come by.....i would appreciate any assistance.:huh:
the list of replaced parts:
CPS
MAP sensor
distributor
plugs/wires/cap/rotor
fuel pump/filter
PCMx3
alternator
battery
used a volt meter to check:
TPS
coolant temp sensor
and after Jeep had it, they have checked all the routine items, as well as some unconventional testing im sure.
It started with this in Feb. 2011:
1991 XJ Sport 4.0L 4x4 AutoTrans
i am firmiliar with my truck and when it needs something critical to continue vehicles proper functions, i get it. i dont use, used parts that pertain to fuel spark or intake. situation as follows....
i install directv with my jeep....
Yesterday, i drove over 75 miles with no incident at highway speeds for the entire day. finish my last job, get in start, drove about a mile. while doing about 55mph, the engine stalls. i pull over turn the key, it starts, runs proper for a few seconds, then stalls. continued this way for 20 mins. start, stall, start, drive 100yds, stall. then i start it and when it tries to stall i feather the gas, and it recovers and just stumbles from time to time till i limp it home.
Today, it starts, idles, and drives fine. an hour into my day it dies again. i fumble with the distributor, to make sure everything is good.up until this point it has new (less than 3 month old) cap, rotor, ACCEL coil. i wiggle some of the old wires and it stumbles as if it is wanted to fire. with no luck i go to store and comeback with new wires and new distributor internal pick-up, a new fuel filter and Lucas inj cleaner (as i origianally assumed trash in fuel) fuel pump and ignition relays and fuses are fully functional. when key is turned, the fuel pump sounds as it always has. still with no results i had to get towed.
at this point this has just been an expensive form of troubleshooting, ie: replace stuff till it works.
i am out of bucks!! the next step that i can think of is Crank Position Sensor.
GURUS< ADVISE IF THE WRONG STEPS ARE BEING TAKEN.
air filter is fine
exhaust is absent of a catalytic converter
when the key is turned it no longer tries to start, but turns over STRONG
i have checked ecu grounds, battery connections and jumpers,MAP connections.
i dont know what else to do, but i feel confident that it is simple parts replacement. i am just afraid of it being something outside of my capabilities.
ANY AND ALL HELP IS APPRECIATED
................................................................................
Since i have replaced the fuel pump as well as PCM with 3 other XJ's. I gave up on trying to figure it out and sent it to the Jeep dealership for some results. after them wrenching on the thing for 3 1/2 months. they have since asked me to come pick it up. they had one answer, "Buy a new PCM" althought they said its most likely not the case. its just the only way to definitive way to rule it out. its got the required fuel pressure, its got spark, and of course...air...isnt the problem.
guys i am desperate, and i feel like i am having to make a life or death decision. after all the money put into it, it dosnt make sense to scrap it. not to mention that I absolutely would if it wasnt for the fact that i dont have new Jeep money right now. If it was just the no start i would feel better about making the decision to pull the plug. however it has a news trans, fully rebuilt front and a custom 8.8 rear, all new ignition, fuel and air systems, 5 brand new BFG KM2's and i am always looking to improve.
I am just worried that if factory trained technicians cant figure it out.....what in the world could it be. I am afraid it is the wiring harness, but jeep couldnt reinforce the thought. it is really frustrating. i would love to communicate with some of the most jeep savvy individuals. i am currently between jobs, so i am available all day. if any one wants to call me or lives in VA and wants to come by.....i would appreciate any assistance.:huh:
the list of replaced parts:
CPS
MAP sensor
distributor
plugs/wires/cap/rotor
fuel pump/filter
PCMx3
alternator
battery
used a volt meter to check:
TPS
coolant temp sensor
and after Jeep had it, they have checked all the routine items, as well as some unconventional testing im sure.
Last edited: