Another surging/hesitating problem unveiled - 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 01-10-2005, 03:51 PM   #1
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Default Another surging/hesitating problem unveiled

I have had the infamous stubbling/surging problem like most folks have discussed here. All the popular culprits have been coil packs, wires, plugs, tranny issues, possible PCM problems.

May not be a huge discovery here but I'd like to shed some light on this. I bought my car with 87k. It now has a little over a 100k on her. Since day one I've had the slight hessitation and stumbling under light engine loads, and most noticeable in 3rd or 4th gear with the TC locked up. It'* not horrible now, but still annoying and has progressively gotten worse since day one. Anyways, after really thinking about it all, i realized what could possibly be causing this, at only light engine loads? What only operates during part throttle/cruise? EGR. So I unplugged the EGR'* stepper motor to see if it changed anything. And yes, my problem is now gone. I have a bad or dirty EGR valve. I also have a CE light now too . But, it appears to me, that even if the valve is dirty or working imporoperly, it might not set a code and the O2'* might not notice enough to set a code from the EGR'* faulty operation either. I think this is what happened in my case. ACtually, I have gotten a CE light once in while in the past month or so, after I had been driving with the surging going on for over a minute or so, then the light popped on. But this is only recently. I've had the hesitation and surging for a while with no CE light.

In conclusion I just thought I'd share what I found out. I was thinking possible coil packs too was my problem, but after discovering the EGR thing, I'm more certain I know the problem. Yeah, I'm polluting the environement more right now, but my car runs the best it'* ever run. Gotta check out the valve soon and see what'* up.
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Old 01-11-2005, 12:02 PM   #2
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Quote:
Originally Posted by jr's3800
<--- wondering what the code is...
Me too.

Once school starts back up next week, I'll bring her in and put the ole Tech II on it and check it out. But first and most importantly, I've got two 12" Soundstreams that need to go in my trunk this week...
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Old 01-11-2005, 12:41 PM   #3
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hmm sounds like somethin i am going through i guess i will check out my egr valve 2
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Old 01-11-2005, 01:43 PM   #4
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Only having had my '93 since X-mas, I'm not quite sure how to go about checking my EGR to see if it needs cleaning and/or replacing....Is it a difficult procedure?...And does the TB need to be taken off/apart to do it?
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Old 01-11-2005, 03:24 PM   #5
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That'* very interesting DJ.

So it seems you were still having your surging problem during a cold winter in central New York? Mine has disappeared since I put in my Intense PCM, but I was thinking the surging might have quit because of the onset of winter here in Iowa. Your symptoms seem to indicate that your problem was still occurring, even with colder air. I'll have to see what happens to my car when springtime rolls around.

Thanks for posting that. It could help a lot of us figure out what'* wrong with our cars.
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Old 01-20-2005, 10:23 AM   #6
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I had the same problem as well. Finally the check engine light came on and I brought the car to the dealership. It was the EGR valve. Here'* the link to my post.

http://www.bonnevilleclub.com/forum/...ic.php?t=29157


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Old 01-20-2005, 07:14 PM   #7
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This is great info. That is also awesome your school has a Tech 2, nice school man!
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Old 01-20-2005, 08:07 PM   #8
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Quote:
Originally Posted by ukie eagle
Only having had my '93 since X-mas, I'm not quite sure how to go about checking my EGR to see if it needs cleaning and/or replacing....Is it a difficult procedure?...And does the TB need to be taken off/apart to do it?
92-93 have a digital EGR as apposed to the linear versions in 94+

see the thing right by the valve cover on the drivers side there is your EGR
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