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HummerGuy -> RE: My PCM tuning with PCMforLess.com - Process and Results (10/7/2006 5:01:16 PM)
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So, it took me about 30 minutes to get the plugs off the PCM. Even after releasing the levers it was really hard to pull the plugs off. I took the PCM off the mounting thinking it would be easier, but it's actually harder because you don't have any leverage like you do when it's attached to the bracket, so it's easier to leave it in the bracket while trying to remove the three wiring harness's. Once I finally jiggled them loose and removed them, obviously the PCM was easy to remove from the bracket. I installed the loaner PCM and had a hard time with one of the three harnesses, where I found I cracked a little tiny orance piece inside one of the harnesses (I'll post the pics later), and after trying to put that harness on for 20 minutes, I examined the other one that was identical and found out about the cracked piece, which I removed and then the harness when in with no problem. All together it took me about an hour to swap them. It would have been about half that time if I would have realized there was a little piece of clip stuck in the harness getting in the way of me locking it back down. It wouldn't go in all the way because of it. I had to do the security relearn procedure to get the car started with the loaner PCM, which took about 35 minutes, and worked successfully. When the truck first started, the engine vibrated alot and it seemed like it couldn't figure out what the appropriate idle speed should be, but after running for about ten minutes, everything smoothed out and it ran just like my original one did. The Check Engine light is on all the time, but that is normal for the loaner PCM since they disable the crank angle sensor. It didn't seem to affect anything in a negative way. SO, despite all of my trouble getting the wiring harness's off and on, everything was pretty smooth. So far, no problems. I drove about 80 miles with the loaner PCM installed and everything is fine. I'll ship them mine on Monday and hopefully I'll get it back before Saturday, but that probably won't happen. So far, so good!
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