Losing Power - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 04-12-2004, 12:35 PM   #11
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If they're history codes, they won't appear with the flash function (assuming that'* how you got the codes). If they're current, they will. You may have damaged the transmission by driving it dry. The friction bands on the TC may be shot. You really need to get a scantool on the car while you're driving to diagnose this. Where do you live? There'* a registry of scantool owners in Techinfo, and we may have one near you.
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Old 04-12-2004, 12:36 PM   #12
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One more thing. I replaced the cat thinking that was the problem but no dice. The cat that was on the car was gutted out. It'* running quieter but has the same problem.
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Old 04-12-2004, 12:38 PM   #13
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You have a transmission problem. We just need to diagnose that further. Need TC slip rpm'* in TC lockup (above 48mph with the cruise control set) and watch the 1-2, 2-3 shifts on the scantool as they take place.
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Old 04-12-2004, 12:42 PM   #14
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I'm in Dallas,Texas. But the transmission shifts just fine. No slips or anything in normal or performance shift.
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Old 04-12-2004, 12:43 PM   #15
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You can't tell TC slip by feel. That'* your major loss of power. If you don't want to go through this right now, disconnect your battery for 30 minutes, reconnect, and drive for a day. See which codes come back.

Your loss of power and previous problems are textbook of a shot TC.
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Old 04-12-2004, 12:53 PM   #16
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Thanks. I'll do just that. But if it is what you diagnosed, is that an expensive repair or should I just get the whole tranny rebuilt?
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