Thread: Replaced harmonic balancer now it barely runs

'04 GP, replaced the harmonic balancer last night. I had replaced the crankshaft position sensor about 2 years ago. After installing it, car started up just fine, idling in my garage. This morning started it up no problem and she drove fine for about 25 mins. After that it just started dying. I was able to pull it off the negative cable for 10min. It would start up a little better but still die as I tried to drive it.

Now I'm not sure if it is or was the crankshaft position sensor or potentially my ICM, i did unplug this to bump the engine to get the crankshaft bolt loose. I installed a Dorman 594-312 so it is the right part. Not sure if it might be the PCM, or camshaft position sensor or not, that wouldn't be fun. If anyone has any ideas I'd appreciate it I'm stuck in a parking lot until I can get it limped back home or to a shop.

So if found this, and I would assume it needs to be done??

The crankshaftposition system variation learning feature calculates the reference period errors that are caused by slight tolerance variations in the crankshaft, the crankshaftbalancer interrupter rings, and the crankshaftposition sensor hall effect switches. The calculated error allows thePCM to accurately compensate for reference period variations. This enhances the ability of the PCM to detect misfire events during a wider range of engine speed and load conditions.

The crankshaftposition system variation values are stored in the PCMnon-volatile memory after a learn procedure has been performed. If thecrankshaftposition system variation values are not stored in the PCM, DTC P1336 will set. The learn procedure is required after the following service procedures have been performed:

PCM replacement
Engine replacement
Crankshaftreplacement
Crankshaftbalancer replacement
Crankshaftposition sensor replacement
Any engine repair which disturbs the crankshaftor the harmonic balancerto crankshaftposition sensor relationship.

Good to know, I'll at least have the shop do one and see if that fixes the problem, thanks. I'm not sure if they did one when they replaced my CPS. So maybe the dampener is a bigger issue, I could be wrong. But I'll have it done and see what comes up.

Turns out it is a bad ICM. I unplugged it last night to bump the engine to get the crankshaft bolt loose. It must have been a short, I did forget to unplug the neg. battery cable, which is my bad, but the ICM was original and had 204k on it...

So it was not the ICM. It stalled out on me on the highway. This problem seems to come up when the rpms are high and or the engine is warm. I'm sure if I let it cool it would run good for a bit but I still can't figure out what it is, I can check the CPS sensor and harness but anything else?

So do I replace the CPS harness then. Now that you mention it when the trouble starts my A/C didn't engage as I was turning that on and off before. I went to go turn it on and it didn't kick on. Could it be the same sub harness or do I have to replace a larger harness??

Is this the harness I need then.

http://www.amazon.com/Dorman-645-688.../dp/B00NF2KDB6