Won't shift into OD, and torque converter w/not stay locked - 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 10-15-2006, 01:09 PM   #11
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Quote:
Originally Posted by Bigfoot
Willren:
I use syn blend oil
No unusual smells
Has never shifted into OD since that hot summer day
No codes
I always leave it in OD, and run it at freeway speeds (70+) and it never shifts to OD

Mike1995:
No speedometer problems
Synthetic may be part of your problem. The TCC may be slipping too many RPM'* and can't lock.

No codes surprises me. That tells me either someone took your bulb out of the SES light, or the PCM isn't requesting OD for some reason.

What RPM do you run at 70?
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Old 10-15-2006, 01:18 PM   #12
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Will, would TPS have a play in this?
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Old 10-15-2006, 01:20 PM   #13
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It could. But if I recall, the MAP and the MAF also do. There are alot of factors on the OBD2 cars with the 4T65E. It'* over-managed to the extreme by the PCM.

Most transmission shops will diagnose for free.
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Old 10-15-2006, 04:33 PM   #14
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I received a TPS code about a year ago and replaced it with an AC Delco.

I have a code now for misfire in #6 on another thread, so the service light is there and works.

I should take it in for an expert to look at. I have had the codes cleared, unless there is a hidden code....

What is the TCC?

Rpms at 70 are about 2800.
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Old 10-15-2006, 04:40 PM   #15
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Torque Converter Clutch.
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Old 10-15-2006, 05:16 PM   #16
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2800 rpms at 70 seems very high.
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Old 10-15-2006, 06:56 PM   #17
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Thats cause its in 3rd gear....mine will run that way when I shift into drive up big hills. 2800 is pretty good.
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Old 10-15-2006, 07:08 PM   #18
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Guys, please go back and read the original post in this topic. 2800 is BECAUSE his TCC isn't locking up.

He KNOWS what it is. We're trying to find out WHY.
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