I chose to place this post here rather than in the modified tech section because it's still all OE Xj parts. Here's the story.
I converted my 88Xj Limited with 4.0L/AW4 to an AX-15 this summer because I could not afford the AW4 fuel economy. A pesky and infrequent problem has surfaced since I performed this work. The engine loses all power while driving down the road. Most of the time engine power is restored within seconds while I am coasting down the road. However, this is not always the case. I think the initial time this problem occurred I experienced 2-3 events like this before they vanished. Most, if not all the remaining experiences have been solitary events.
I have the AW4 harness still attached so the pins permitting crank are jumped. This causes the "Check Engine" light to be on continuously. Is there a way I can get codes through the "Check Engine" light with this Renix vintage Xj? I have tried the three consecutive on-off key cycles but my "Check Engine" light is on permanently anyway so I cannot tell if the key cycle method is incorrect for my vehicle or if the always on status of my "Check Engine" light is creating the difficulty in obtaining any code I might have. What scan tools would read this ECM besides the DRB-II?
I chose to replace the crank shaft position sensor (CPS) when I converted to the AX-15 to be cautious. However, I retained the original CPS and will solder its broken wire and use it to help troubleshoot my issue.
I had it at the repair shop Thursday and Friday and they found an engine ground to the fire wall that was loose. However, this results in improved starter energy only. I picked the vehicle up and it stalled on me two times the next morning.
It seems to me this is a CPS issue, engine electrical power or distribution, spark or fuel issue.
Any ideas? I must make this vehicle reliable immediately!
Rick
I converted my 88Xj Limited with 4.0L/AW4 to an AX-15 this summer because I could not afford the AW4 fuel economy. A pesky and infrequent problem has surfaced since I performed this work. The engine loses all power while driving down the road. Most of the time engine power is restored within seconds while I am coasting down the road. However, this is not always the case. I think the initial time this problem occurred I experienced 2-3 events like this before they vanished. Most, if not all the remaining experiences have been solitary events.
I have the AW4 harness still attached so the pins permitting crank are jumped. This causes the "Check Engine" light to be on continuously. Is there a way I can get codes through the "Check Engine" light with this Renix vintage Xj? I have tried the three consecutive on-off key cycles but my "Check Engine" light is on permanently anyway so I cannot tell if the key cycle method is incorrect for my vehicle or if the always on status of my "Check Engine" light is creating the difficulty in obtaining any code I might have. What scan tools would read this ECM besides the DRB-II?
I chose to replace the crank shaft position sensor (CPS) when I converted to the AX-15 to be cautious. However, I retained the original CPS and will solder its broken wire and use it to help troubleshoot my issue.
I had it at the repair shop Thursday and Friday and they found an engine ground to the fire wall that was loose. However, this results in improved starter energy only. I picked the vehicle up and it stalled on me two times the next morning.
It seems to me this is a CPS issue, engine electrical power or distribution, spark or fuel issue.
Any ideas? I must make this vehicle reliable immediately!
Rick
indicated the AW4 TPS works fine and may require adjustment if but mine has never had issues.
