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.

Perform Shift and Normal Shift do nothing?

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Old 03-19-2007, 07:42 PM
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Sorry..I thought we were talking about the 98'*. 92-99'* had them .
Old 03-19-2007, 07:49 PM
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Originally Posted by BillBoost37
Sorry..I thought we were talking about the 98'*. 92-99'* had them .
D'oh! No, I'm sorry, I thought you were talking to me. LOL

I blame the pain-killers!! Again!!
Old 03-19-2007, 07:52 PM
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I'll blame the Goose..
Old 03-19-2007, 08:39 PM
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so there is NOT supposed to be any difference on the 98s between the buttons?
Old 03-19-2007, 08:52 PM
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There is.

Your PCM defaults to normal mode for a NA car in Performance mode.

Your PCM retards the shifts in economy mode by inducing a resistance (voltage divider circuit to drop the voltage from 5V at the PCM to 2.5V) in order to slightly retard the shift points for greater economy.

I have personally never seen a resistor short across the leads, so I'd say you have a short to ground holding that pin at a constant 5v and preventing the resistor from being introduced into the circuit.
Old 03-19-2007, 09:15 PM
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Originally Posted by willwren
There is.

Your PCM defaults to normal mode for a NA car in Performance mode.

Your PCM retards the shifts in economy mode by inducing a resistance (voltage divider circuit to drop the voltage from 5V at the PCM to 2.5V) in order to slightly retard the shift points for greater economy.

I have personally never seen a resistor short across the leads, so I'd say you have a short to ground holding that pin at a constant 5v and preventing the resistor from being introduced into the circuit.
Where is this resistor you speak of? I'm happy to get the dmm with long leads to test while driving or whatever I need to do.
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