P0344 Code Only

[NCunlimitedLJ]

Hey Folks,

Looking for some advice. Recently received a code for P0344 and limp mode. Ordered a ThinkDiag2 to check timing and the Cam Crank Difference was at 9.10 degrees but Cam Sync State showed In Sync. I adjusted the ODPA to get within 0.5 and forced a relearn. After some driving, I have realized I can get the P0344 to pop (along with limp mode) any time I go WOT.
Today I pulled up the live monitors on the ThinkDiag2 for Cam Crank Difference, Cam Crank Last Lost, Cam Sync State and CrankSynk State. Starting out on the drive the Cam Crank Difference was 0.90 — as I went WOT this went to 2.40 before finally popping a CEL and going to 6547 (which from another thread I realize is a negative value and a shortcoming in the ThingDiag2).

I have read various threads concerning the issue, I have checked wires and I am not getting any other CELs. I don't think this is a wiring issue or ground issue as I can only replicate at WOT. I dont feel any slop in the timing set by turning the crank bolt. Could this be the ODPA by chance? I also dont think its the sensor (which I assume is the original Mopar sensor) since it can only be replicated at WOT. Any ideas on where to look next? I do have a Crown ODPA coming soon.

Some quick details:

- 2005 LJ Automatic
- 160K Miles

Appreciate any advice.

Thanks,

 

[Chris]

Hey Folks,

Looking for some advice. Recently received a code for P0344 and limp mode. Ordered a ThinkDiag2 to check timing and the Cam Crank Difference was at 9.10 degrees but Cam Sync State showed In Sync. I adjusted the ODPA to get within 0.5 and forced a relearn. After some driving, I have realized I can get the P0344 to pop (along with limp mode) any time I go WOT.
Today I pulled up the live monitors on the ThinkDiag2 for Cam Crank Difference, Cam Crank Last Lost, Cam Sync State and CrankSynk State. Starting out on the drive the Cam Crank Difference was 0.90 — as I went WOT this went to 2.40 before finally popping a CEL and going to 6547 (which from another thread I realize is a negative value and a shortcoming in the ThingDiag2).

I have read various threads concerning the issue, I have checked wires and I am not getting any other CELs. I don't think this is a wiring issue or ground issue as I can only replicate at WOT. I dont feel any slop in the timing set by turning the crank bolt. Could this be the ODPA by chance? I also dont think its the sensor (which I assume is the original Mopar sensor) since it can only be replicated at WOT. Any ideas on where to look next? I do have a Crown ODPA coming soon.

Some quick details:

- 2005 LJ Automatic
- 160K Miles

Appreciate any advice.

Thanks,

Getting it to show up only at WOT can definitely point towards something specific happening under load.

Since you've already adjusted the ODPA and forced a relearn, it’s would be wise to continue monitoring the cam / crank difference as you’re doing. A difference of 9.10 degrees initially is a bit concerning, despite getting it closer to 0.5 after your adjustment.

Since the code seems to trigger specifically at wide open throttle, this could suggest that the engine is experiencing a condition where the timing isn't keeping up with the demands being placed on it. The Crown ODPA you mentioned could potentially improve the situation, especially if the current one is worn or out of spec.

You may also want to consider these additional areas:

• Sensor Wiring & Connectors: Even though you didn't find any clear issues, make sure to inspect the connectors for the camshaft and crankshaft position sensors for any signs of wear or poor connection, especially under load.
• Timing Chain / Belt Condition: With your mileage, it’s worth verifying that the timing chain or belt hasn’t stretched or that the tensioners are functioning properly. Even slight wear can lead to discrepancies under load.
• Check for Vacuum Leaks: Sometimes, a vacuum leak can become more pronounced under load, affecting sensor readings.
• Replace the Camshaft Sensor: Since you suspect the sensor might not be the issue, it's still worth considering that a failing sensor can produce intermittent issues, especially under specific conditions like high RPMs.
• Look into Fuel Delivery: A fuel delivery issue (like a weak fuel pump or clogged filter) could also cause performance issues under WOT, which might indirectly affect the timing.

Keep us posted on your progress, especially after installing the new ODPA.

Best of luck!