Surging when warm - 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 10-24-2005, 02:42 AM   #1
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Default Surging when warm

I have a 92 SSEI that runs awsome when driven short distances, but when driven for over a couple of hours I have a surging problem under any kind of load, part throttle and full throttle to the point where I could not quite crest a long gradual hill. The longer I drive the worse it gets. If I cycle the ignition the problem seems to improve for a short time.
I have removed the cat,replaced the plugs and wires.The coil was tested and ok. Can anybody help me out here I'm running out of ideas?
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Old 10-24-2005, 04:05 AM   #2
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Default Re: Surging when warm

Quote:
Originally Posted by bratt144
I have a 92 SSEI that runs awsome when driven short distances, but when driven for over a couple of hours I have a surging problem under any kind of load, part throttle and full throttle to the point where I could not quite crest a long gradual hill. The longer I drive the worse it gets. If I cycle the ignition the problem seems to improve for a short time.
I have removed the cat,replaced the plugs and wires.The coil was tested and ok. Can anybody help me out here I'm running out of ideas?
Thanks Bratt144
Define 'surging'.

Is it an increase/decrease in rpm'* on the tach? Or is it a stumble felt under load and light throttle? This is the key to finding the source.
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Old 10-24-2005, 09:38 PM   #3
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Default surging

It sounds like from your description of the problem that you might have a problem with the filter on the intake side of the fuel pump in the gas tank. It takes a few hours for the dirt in the tank to clog that filter then you start running very lean. It will cause surging and low power. If you turn the car off and let it sit for a time the dirt will fall off the filter and it will run OK until it clogs again. If it sits overnight it might take more than an hour to clog again. I worked in the dealerships for Pontiac for about 25 years and I have seen this happen more than once. This MIGHT be the cause of your surging. Hope this helps. BTW there is no test for this condition except to drop the gas tank and removed the pump and filter to inspect it.
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Old 10-25-2005, 01:28 AM   #4
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Default surging or stumbling

stumbling might be a better description of the problem, the car will cruise just fine and under slight throttle will increase in speed but any excessive throttle and the car falls flat with no increase in speed or rpm.

The fuel filter in the the gas tank sounds pretty reasonable, i'm going to pull it out and inspect it. Any other suggestions?
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Old 10-25-2005, 01:35 AM   #5
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If the problem is under light load in OD or climbing a hill under light load, you may be better served by replacing your plugs and wires, particularly if you don't know how old they are.

What brands of wires and plugs do you have?
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Old 10-26-2005, 12:27 AM   #6
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Default Surging when warm

this condition occurs under all load condions and in all gears the plugs and wires are new from GM
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Old 10-26-2005, 01:13 AM   #7
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changed the fuel filter lately?
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