97 SE surges at 2000 rpm?? - 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 01-04-2006, 12:39 PM   #1
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Default 97 SE surges at 2000 rpm??

Bonneville SE, 97 surges between 2000 and 2200 rpm under light load after warming up. Constant, rhythmic surge, not a sputter.

I disconnected the EGR sensor, no result.
Replaced the AIT (air intake temp) no result.

Any ideas?? Nice board by the way.

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Old 01-04-2006, 12:47 PM   #2
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Trev...any other info you can provide will be very helpful

Plugs and wires are what and changed when?
have you checked coils?
When was the last throttle body cleaning?
This is happening in 4th gear with TCC lockup right?
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Old 01-04-2006, 01:01 PM   #3
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Quote:
Originally Posted by BillBoost37
Trev...any other info you can provide will be very helpful....
This is happening in 4th gear with TCC lockup right?
4th, at 2000 rpm only while lockup. Yeah. Plugs and wires changed. Only surges at 2000. kick it into a higher gear and it takes off. So, at WOT, as the computer ignores the sensors, it runs great.

It seems as though SOME sensor is misreading and the computer adjusts to compensate, then readjusts when another sensor shows resulting reading and then all over again. Makes sense because it'* a steady, rhythmic surge.

Oh, and I disconnected the AIT sensor and it ran fine...replaced with new and it still surges.

But what sensor is it? that'* the Q.

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Old 01-04-2006, 01:41 PM   #4
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Once TCC lockups any surging is typically in the ignition system.

What kind of plugs and wires did you put on the car and can you ohm test your coils by checking the resistance between the two leads on each coil pack. All 3 should be within a reasonable tolerance of each other.
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Old 01-04-2006, 01:55 PM   #5
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[quote="BillBoost37"]Once TCC lockups any surging is typically in the ignition system.
[quote]

Hmmm.....someone else put on the plugs and wires. I'll check the coil and see what kind of readings I get. I was thinkin that if it was a coil problem, it would have little to do with temperature.

Rock on....and thanks for your quick replies, keep 'em coming.
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Old 01-04-2006, 02:12 PM   #6
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Coils warm up as well internally and if there is a slight short or something it can increase with resistance.

One thing to keep in mind is many here have had big issues with using Bosch plugs and wires on bonnevilles. No idea as to why, they tend to burn up and cause this type of issue w/in a month or so of being installed.
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Old 01-04-2006, 02:58 PM   #7
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Quote:
Originally Posted by BillBoost37
Coils warm up as well internally and if there is a slight short or something it can increase with resistance.

One thing to keep in mind is many here have had big issues with using Bosch plugs and wires on bonnevilles. No idea as to why, they tend to burn up and cause this type of issue w/in a month or so of being installed.
Well, I reset the computer with the new IAT sensor in and it seems to have fixed the problem. Would resetting the computer do it????

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Old 01-04-2006, 03:02 PM   #8
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It could, if the IAT was the problem. it could also have reset the code or problem to only come back soon. Hopefully, all you needed was the reset.
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Old 01-04-2006, 04:29 PM   #9
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If the code/* come back again have the codes read before blanking the Puter again.... This may point to a ignition or fuel related issue if the problem returns...

Good Luck

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Old 01-12-2006, 01:18 PM   #10
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Hmmmm.....yep, as predicted....the problem is back. Not quite as severe, but still surging. Gonna swap out the coil pack and see how that goes.....troubleshoting, what fun!!!

Thanks for all your help guys.

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