- Location
- Henderson, NV
So, it's been awhile since Ive posted here to the forum, and I do have some updates for the rig. I'll start with the current status of the rig, and it is broken, sitting in my garage, without a motor in it.
After the radiator was in I was enjoying cool running engine temps and all was good; up to the point at which it wasn't. I had a misfire code pop up on me a coupe times. #4 had a sporadic misfire that I cleared several times and when I went to troubleshoot I found what I thought to be the culprit, a loose injector connector with a bad clip. So I did a quick temp repair and safety wired the connector down and cleared the code again. Engine seemed to be running fine, and I had no reason to suspect that there was anything else going on. On my way to work a couple nights later, and now the CE light came back on and this time was flashing, with engine vibes. I pulled off the side of the road and shut it down. checked my safety wire job on the connector, and all seemed good, so now I knew it was something else. I got the Jeep home and began troubleshooting, And may I say, working with aviation fault isolation manuals and wiring schematics is 100000000x better than working with the chrysler's troubleshooting tips, or wire prints.
After checking spark plugs caps and injectors, and all of the other AllData recommended checks I did an exhausting wiring check out of the Fuel injector harness. I found that cylinder 4 had continuity across the pins in the connector and also had continuity with cylinder 3 pins. So, I found my real problem, a bad Ecu harness that had fused together several wires in the bundle right above the exhaust manifold by cyl 4. I contemplated just fixing the bad wires, however, I felt this left me open the the possibility of future problems.
So I set out chasing down wires and restringing a new harness with High temp 20ga stranded pair wires from the ECU to the Fuel injectors and some of the sensors on the intake manifold. I also gave it little aviation touch by adding two 10 pin cannon plugs. This gave me the ability to splice the new harness into the existing harness while also giving me the ability to quickly remove the engine sensor harness completely off of the engine and out of the bay. Preventing damage to the harness during engine maintenance. Since I was rerouting wires, and Chrysler doesn't draw prints as a system but instead as individual components, I drew up my own wiring print for the new harness.
As you can see, I consolidated all the information from 8 different prints into this one print, and illustrated my mod to the harness. P1 and P2 connectors are the two cannon plugs i added to the harness and labeled their respective pins. I essentially ended up with a cannon plug for the injectors, and a cannon plug for the manifold sensors.
I was very pleased with the way it turned out. I even went through and used lacing cord to secure the harness, and then sleeved it back up with new plastic wire loom(?). After reinstalling and verifying all my pin outs were correct I started up the jeep. No CEL, or engine vibes, however, now the engine had a distinct ticking noise, like lifter noise.
After the radiator was in I was enjoying cool running engine temps and all was good; up to the point at which it wasn't. I had a misfire code pop up on me a coupe times. #4 had a sporadic misfire that I cleared several times and when I went to troubleshoot I found what I thought to be the culprit, a loose injector connector with a bad clip. So I did a quick temp repair and safety wired the connector down and cleared the code again. Engine seemed to be running fine, and I had no reason to suspect that there was anything else going on. On my way to work a couple nights later, and now the CE light came back on and this time was flashing, with engine vibes. I pulled off the side of the road and shut it down. checked my safety wire job on the connector, and all seemed good, so now I knew it was something else. I got the Jeep home and began troubleshooting, And may I say, working with aviation fault isolation manuals and wiring schematics is 100000000x better than working with the chrysler's troubleshooting tips, or wire prints.
After checking spark plugs caps and injectors, and all of the other AllData recommended checks I did an exhausting wiring check out of the Fuel injector harness. I found that cylinder 4 had continuity across the pins in the connector and also had continuity with cylinder 3 pins. So, I found my real problem, a bad Ecu harness that had fused together several wires in the bundle right above the exhaust manifold by cyl 4. I contemplated just fixing the bad wires, however, I felt this left me open the the possibility of future problems.
So I set out chasing down wires and restringing a new harness with High temp 20ga stranded pair wires from the ECU to the Fuel injectors and some of the sensors on the intake manifold. I also gave it little aviation touch by adding two 10 pin cannon plugs. This gave me the ability to splice the new harness into the existing harness while also giving me the ability to quickly remove the engine sensor harness completely off of the engine and out of the bay. Preventing damage to the harness during engine maintenance. Since I was rerouting wires, and Chrysler doesn't draw prints as a system but instead as individual components, I drew up my own wiring print for the new harness.
As you can see, I consolidated all the information from 8 different prints into this one print, and illustrated my mod to the harness. P1 and P2 connectors are the two cannon plugs i added to the harness and labeled their respective pins. I essentially ended up with a cannon plug for the injectors, and a cannon plug for the manifold sensors.
I was very pleased with the way it turned out. I even went through and used lacing cord to secure the harness, and then sleeved it back up with new plastic wire loom(?). After reinstalling and verifying all my pin outs were correct I started up the jeep. No CEL, or engine vibes, however, now the engine had a distinct ticking noise, like lifter noise.
atriot:
