RPMs "quivering" - 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 10-23-2002, 05:31 PM   #1
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Default RPMs "quivering"

My friend and I replaced the alternator and battery on my 97 SSE this weekend.

however, since then, the rpms have been acting wierd

at idle, the needle is around 750, but completely randomly, it just moves up a little, then back down, with no pattern.

Earlier I posted the car sometimes shudders, and RPMs go up and down on fractions of like 100s of RPMs.

but now, even when im driving, the rpms just waiver all over... it hasn't stalled out, but it idles rough. Could we have screwed something up by replacing the alternator, I can't imagine what would have been effected though....? I did wires and plugs recently too.
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Old 10-23-2002, 05:49 PM   #2
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Check your ignition system... the wires, the plugs.. and hopefully not the coil packs
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Old 10-23-2002, 07:59 PM   #3
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Also sounds like your engine is hunting for the idle spot. You could have a restriction in the intake tract.
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Old 10-23-2002, 08:11 PM   #4
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Or a textbook example of a bad tps. you scan codes yet?
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Old 11-09-2002, 08:33 PM   #5
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Sounds like a bad TPS.
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Old 11-10-2002, 02:13 PM   #6
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hey everybody thanks for your responses

I was thinking bad TPS myself, but there are NO codes stored

I cleaned the throttle body, MAF, even had the injectors ran through the machine

still no good

now what??? I don't even have a sensor code to point me in the right direction!
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Old 11-10-2002, 03:32 PM   #7
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With no codes, we can actually narrow it down some. It'* probably not the TPS or the MAF sensor. How old are your O2 sensors? If they're stock I'd recommend changing at least the one in the downpipe. If it'* reading wrong, it can try to run you too lean or too rich. You have the pre-heated type, they run about $60, and stay away from Bosch!

Your IAC could be a problem, or the TB itself. If you haven't done so, I'd suggest removing the TB and cleaning it thoroghly. Be very careful with the MAF sensor. You may also want to check your fuel pressure at the rail, and replace the fuel filter if it'* due.

I'm not leaning this direction, but go ahead and check out your coil packs. I posted a section in Techinfo on this topic. Pull one or two plugs and inspect them, too. You want light tan deposits, nothing else.

Just a few ideas. With no codes, it makes it a bit harder, but usually means less expensive to fix, too!
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Old 11-11-2002, 01:15 PM   #8
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Also, I forgot to mention...

Since I've bought it, occasionally on the freeway, around 60-70mph, the car will shake, hesitate, and the RPMs will quiver, similair to what I originally posted for...

It only does it when I've drive it for a long time in a row, and when it'* slightly humid out...

???

I really would like this car to run right, I thought Bonnie'* were supposed to be very well built!
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Old 11-15-2002, 10:08 AM   #9
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I seem to be having the exact same problem with my 94 SE. I'm going to see my GM mechanic friend this weekend and if we find problem, I will let you know. If you solve it before us, let me know!
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