Disconnected Battery.....Now a major loss of power. - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-30-2004, 05:55 PM   #1
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Default Disconnected Battery.....Now a major loss of power.

Well I am still fighting my Cruise Control problems which has now involved the replacement of most of the parts. But anyway I thought I would "reset" the pcm because it might have a code that did not throw a light that would somehow disable the cruise control....or not...


Anyway disconnected the battery last night, turned it on this morning and after driving around a while I punched it a little and WTF there is hardly any power. It took about 7 or 8 seconds to get to 60 yesterday, now it takes maybe 13 or 14.

I have read posts about "PCM relearning" but am still stumped.



What did I do?
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Old 12-30-2004, 08:06 PM   #2
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it takes a little bit for the PCM to relearn it self
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Old 12-30-2004, 09:08 PM   #3
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Disconnect and clean all your battery connections, even the grounds. Both ends of each cable. I suspect a bad cable, and by disconnecting it, you made it worse. Consider changing them all.
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Old 12-30-2004, 09:18 PM   #4
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also give it 100 or so miles to re-learn.
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Old 12-30-2004, 11:12 PM   #5
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I cleaned off all the connections today but it still has the issue.

It seems as if there is a power loss after a certain RPM range. It is like it would have a clogged fuel filter or clogged cat but both are newer on this car.

It takes off ok in 1st until about 25 then it really lags meaning the engine sounds like it is working but not really going anywhere.

At WOT on flat ground it will only go to about 35 now before it shifts, whereas before it would go in the mid 40'*. There are no dummy lights going off either.

I took it on the highway again and it really lags past 30mph or so, and it barely moves to the point I have kia rio'* beating me on the onramps.

It engine sounds really good at idle though and revs up smooth so I am really stumped.
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