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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 12-08-2006, 03:58 PM   #11
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Hi again to all,
Still wondering if this car is performing as well as it should.
I've noticed when travelling at about 90-100km/h the boost is still reluctant to cross over the 0 mark. Should I consider the boost bypass adjustment trick? It would be nice to have it kick in a bit sooner so my wife and I can get our grocery shopping done sooner.

The car still "chugs" a bit, and lets out a sound: Best way to describe it would be a backfire from a carburetor. (obviously impossible, just using this for description purposes) It seems to happen more when the car is at cruising speed and I tromp on it a bit. When I let off the throttle, it moves along just fine.
Any ideas?

I have: Changed plugs and wires, checked air filter, changed engine oil, tried fuel injector cleaner (helped a bit) and run premium gas in it.

Thanks,
Adam
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Old 12-08-2006, 05:30 PM   #12
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What do you mean, you ran some premuim gas?

You should always be running premium. Talk to us..what are your plug wires and plug brand names?
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Old 12-08-2006, 06:11 PM   #13
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I believe the previous owner ran regular unleaded in the car. Since I've owned it I always dump premium in it.
The new plugs are AC Delco, the wires are Belden.
The fuel filter was changed just before I bought the car.
Other than that, I haven't done much to the car.
It runs and drives great, it'* just the items listed above are the annoying things I have discovered since owning it.
This is my first Supercharged car, and I am unfamiliar with how they should behave.

Could the ignition module below the coil packs be a suspect?

Thanks again,
Adam
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Old 12-08-2006, 06:15 PM   #14
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Quote:
Originally Posted by labonnevillastrangiato
I believe the previous owner ran regular unleaded in the car. Since I've owned it I always dump premium in it.
The new plugs are AC Delco, the wires are Belden.
The fuel filter was changed just before I bought the car.
Other than that, I haven't done much to the car.
It runs and drives great, it'* just the items listed above are the annoying things I have discovered since owning it.
This is my first Supercharged car, and I am unfamiliar with how they should behave.

Could the ignition module below the coil packs be a suspect?

Thanks again,
Adam
WHOA! I sure hope he wasn't running regular unleaded as it clearly says "Premium Unleaded" under the fuel gauge. If he did run 87 in it, the engine is most likely damaged, i am not saying it is, but it could be.
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Old 12-08-2006, 07:08 PM   #15
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Have you checked each coil individually using the procedure in Techinfo? Can you verify your plug wires are not touching the O2 sensor harness? How old is the O2?

After dark, try misting water over the plug wires while it idles, and look for sparking.
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Old 12-09-2006, 12:38 AM   #16
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Thanks for the replies,
Is there an easy way to check the O2 sensor for correct function?
I just got my hands on a set of technician service manuals for the car, so I will refrain from my obvious question: Where is the O2 sensor? I'll look it up...

I have continuously noticed something: There seems to be a bit of a "pause" before you feel the pull as the */c goes into positive boost. Almost a lag??

I've been pretty gentle with the car, but tonight I managed to get the boost into a higher + range, and the car took off. It seems that if you ease the throttle up, it will take off, but if you rapidly accelerate, the problem occurs.

I'll try all of your much appreciated suggestions, and let you know how it goes. If you can think of anything else, please let me know.
I'm sure it'* minor, as the car runs just great otherwise (touch wood...)

Adam
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Old 12-12-2006, 09:43 AM   #17
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Hi everybody.
I'm happy to report it was indeed a malfunctioning coil pack.
Crazy stuff.
Thanks to Will'* link for testing the packs, I found one that had the primary resistance all over the map.
As luck would have it, I happened to have a set of packs in my basement from when I had a 2.8L Chevy Celebrity. They used the exact same packs, same part number marked on the bottoms. I checked that set, and replaced all 3 and off I went.
I took it for a test drive, hit the gas, no more hesitation, no more funky noises, gets to boost quickly, and the car takes off nice.
When I walked back into my house I looked like this:
My wife said, "I take it the car is fixed"
Yes it is, for now...

Thanks again to all. I have a few posts on the go, so I will add this note in case others are experiencing the same problem.

Cheers,
Adam
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Old 12-12-2006, 10:04 AM   #18
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Another happy customer. In the future, it'* bad practice to cut and paste the same reply into three different topics.

Sounds like it'* time for this topic to move to 92-99 with your other one. Since you've already got your replies from us all over the place, it might be best to start a new topic next time, or continue with either this one or the other one if it relates.
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Old 12-12-2006, 12:05 PM   #19
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Hi Will,
Thanks, I'll keep that in mind for next time.
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