Shift points ? - 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 07-26-2003, 02:09 AM   #1
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Default Shift points ?

Can someone tell me the correct shift points or speeds? I have tried the normal shift setting and the performance shift setting and still have the same complaint. The problem is it feels like I am in overdrive by about 48 mph. The low end shifts feel solid and the power is good until the last shift. The pedal is still there and I can accelerate, it is just flat unless I let off and hit it again. Then the down shift happens and it is fine until it kicks out. Please tell don't tell me it is a tranny problem. :( I'm hoping that there is an adjustment that can be made. I don't think there is any exhaust restrictions.

What do you think? Any suggestions?


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Old 07-26-2003, 01:19 PM   #2
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We just need to remember that Performance shift ALLOWS it to shift near redline, and economy shifting LIMITS the shift RPM, but this would only be apparent under WOT.

If it doesn't shift at about a 500 rpm difference between the 2, it has to be the TPS. That'* the only indicator of WOT, other than manifold vac, maybe.
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Old 07-26-2003, 07:54 PM   #3
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The TPS crossed my mind, but I was also thinking that if were really out of whack it would trip the SES light. It does shift with a 500 rpm difference. Whats the best way to test/adjust the TPS with out a scan tool? Or......., am I showing my ignorance about sensors, scan tools and computer control systems?
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