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Old 07-22-2007, 03:48 PM   #1
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Default PCM Relearn - Tranny Related

Figured I'll post here instead of the Impala forums just because you guys know a lot more about this stuff

Yesterday when I was at Pinky'*, we removed my PCM to look at the airbox, and right after we plugged it in, I did a big no-no and did a WOT run... yeah... Now my tranny is shifting like ****... it'* the weirdest thing, when you start it up and drive, it takes a LOOOOOOOOOONG time to shift, like 2 or 3 seconds, then after about 5 minutes, it shifts relatively normal, then 5-10 minutes after it BANGS! into gear. Then when I shut it off and start it back up, it restarts the process. I know that this is a PCM issue, so I don't know whether to keep driving like this (I REALLY don't want to do that to my tranny), or to unplug the PCM again and let it relearn. Thoughts?
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Old 07-22-2007, 04:11 PM   #2
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I'd go with a relearn.
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Old 07-22-2007, 10:43 PM   #3
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I agree...I'd certainly start with that over any other option. Disconnecting the battery may be the easier route, however.
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Old 07-22-2007, 11:45 PM   #4
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I agree on a re-learn.

Also is this a Intense PCM? If not you should check out one of their newer promotions

Ed
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Old 07-23-2007, 04:59 PM   #5
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I ended up unplugging the battery for a few minutes, got back into the car and everything was working fine ...



...up until about 5 minutes ago. I was just getting back from a 20 minute drive when it started to BANG into gear again. And now it'* starting to make a low pitched whine. I fear that I am in for the worst. I just had this transmission flushed 2k miles ago.
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Old 07-23-2007, 05:11 PM   #6
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Cfoote is finding this in his Aurora...it appears to be a soleniod or valve issue in the trans.

Unplugging the pcm and what you did isn't bad or usually a cause for a relearn. You didn't crank the engine etc.

Try unhooking the pcm and ensuring all the pins look to be seated properly.
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Old 07-23-2007, 06:19 PM   #7
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You could be having problems with the pressure control solenoid, which can cause harsh shifts. Sometimes, if you're lucky, it just gets sticky and pouring in a can of SeaFoams TransTune will free it up. If not, it will have to be replaced. The side cover on the tranny has to be pulled to replace it.
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Old 07-24-2007, 12:11 AM   #8
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I'll be putting some trans tune in it tomorrow, thanks Archon!
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