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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 09-28-2006, 12:31 PM   #1
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Yesterday, while stopped in daytime traffic in my '92 SSE */c, I pressed the window DOWN switch and held it for a couple of seconds while the window already happened to be all the way down. To my surprise, the engine idled a little more rough and the boost gage needle moved up a little bit (maybe 1/16") while the window switch was pressed. I released the switch and the engine idle and boost gage needle returned to their previous conditions. I repeated this test consistently using a window DOWN switch for a window that was already down, and the window UP switch for a window that was already up. This proves that the change in engine/boost behavior was no coincidence.

Have any of you ever noticed this before? Is it normal

It seems odd to me - maybe there'* a problem with an electrical ground somewhere, or maybe my alternator isn't regulating the voltage well enough? It'* an AutoZone DuraLast Gold alternator that'* not very old, and the battery isn't very old either.

I'll try this same test with my '93 SSEi and post the results as soon as I get a chance, but my wife drives that car.
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Old 09-28-2006, 12:49 PM   #2
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That window motor pulls a substantial amount of current so the alternator had to keep up with the load which in turn took more engine power and that was reflected in the boost gage.
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Old 09-28-2006, 01:38 PM   #3
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You are correct. Time to pull all battery cable connections at all ends and check/clean them thoroughly.
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Old 10-02-2006, 04:40 PM   #4
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Well, to answer my own question, I tried the same test on my '93 SSEi, and the boost gage did the same thing (it moved up just a little), so either this is normal behavior, or both of my bonnies have the same problem.
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Old 10-02-2006, 05:05 PM   #5
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It probably has to do with the extra load put on the electrical system and the engine compensating for it.

I did try it on my car. No change in engine.
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