More Fishing ..... - 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 04-04-2003, 09:12 PM   #1
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Hey All -

Haven't had time/money to explore this on my own, but thought I'd fish for some input here, maybe narrow down the possibilities...

'93 SSEi, with 94/95 SC (w/ undersize pulley) and TB, having some drivability problems (stalling/rough running when cold, BIG flat spot in power at highway speeds) and I was wondering a few things ....

Are the PCM units themselves the same from 92 - 94, where I could just get a '94 prom to plug into the original PCM? I'm thinking that since I have a larger TB diameter, and the smaller drive pulley on the SC, that the "window of adjustment" of the '93 PROM isn't large enough to allow it to tune itself with the greater airflow it'* getting. The '93 had the smaller diameter throttle body, and unless I'm wrong, the PCM basically uses the TP sensor input, the MAF input, and the physical diameter of the TB to calculate the proper amount of air coming in, along with a pre-programmed "baseline" amount of fuel for said amount of air, and the O2 signal to monitor/modify the amount of fuel it should be providing.

But, my TB is larger in diameter than original, so that parameter is out the window as far as the PCM is concerned, which would create a lean condition and probably comtribute to some of the problems I'm having...

SO ..... I'm wondering if I can put a '94 PROM or '94 PCM w/ Prom in my car in order to help it handle the additional airflow that I'm getting. Any ideas? If so, anyone have a '94 Prom/PCM they'd be willing to sell?

Again, TIA !!!

Brian
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Old 04-04-2003, 10:29 PM   #2
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Originally Posted by Gearhedd
Hey All -

Haven't had time/money to explore this on my own, but thought I'd fish for some input here, maybe narrow down the possibilities...

'93 SSEi, with 94/95 SC (w/ undersize pulley) and TB, having some drivability problems (stalling/rough running when cold, BIG flat spot in power at highway speeds) and I was wondering a few things ....

Are the PCM units themselves the same from 92 - 94, where I could just get a '94 prom to plug into the original PCM? I'm thinking that since I have a larger TB diameter, and the smaller drive pulley on the SC, that the "window of adjustment" of the '93 PROM isn't large enough to allow it to tune itself with the greater airflow it'* getting. The '93 had the smaller diameter throttle body, and unless I'm wrong, the PCM basically uses the TP sensor input, the MAF input, and the physical diameter of the TB to calculate the proper amount of air coming in, along with a pre-programmed "baseline" amount of fuel for said amount of air, and the O2 signal to monitor/modify the amount of fuel it should be providing.

But, my TB is larger in diameter than original, so that parameter is out the window as far as the PCM is concerned, which would create a lean condition and probably comtribute to some of the problems I'm having...

SO ..... I'm wondering if I can put a '94 PROM or '94 PCM w/ Prom in my car in order to help it handle the additional airflow that I'm getting. Any ideas? If so, anyone have a '94 Prom/PCM they'd be willing to sell?

Again, TIA !!!

Brian
Why exactly did you switch to the 94/95 SC and TB??? Am I the only one or does this sound like another FLOZ incident. By any chance is this a "FLOZ" supercharger???
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Old 04-05-2003, 08:31 AM   #3
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In regard to the FLOZ question ..... how'd you guess? Maybe I should just rebuild my original one, and try to sell off the other, but I'd like to take advantage of the larger TB, etc. .... I didn't know about the hybrid OBD systems until yesterday. Anyone else got a bucket to help bail me out?
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