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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 02-02-2011, 10:27 PM   #91
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That'* what I thought. If I unplug it, it still runs rough, but the actual misfire code goes away.

Which fits in line with the fact I essentially don't have a cat, running lean, smelling rich, MASSIVE LOUD backfires.

Sounds to me a new MAF and a new cat will fix my issues completely.
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Old 02-02-2011, 10:32 PM   #92
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Exhaust leaks will cause you to run real rich because it'* letting air in to the system after combustion. So the O2 sensor thinks the engine is running lean, so it adds fuel when it really doesn't need it.
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Old 02-04-2011, 02:10 PM   #93
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One shop told me aftermarket cats aren't good for this engine? Lol..
got a suggestion on a "good" aftermarket cat? Thinking I'll buy it myself then take it somewhere for them to do.
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Old 02-04-2011, 02:16 PM   #94
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I got mine from ZZP, I think it was like $70. Never had any problem with it and I think I have over 3 years on it.
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Old 02-05-2011, 03:50 AM   #95
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Awesome!! I'll take it to maxi muffler monday...they said a weld job for it if it can be welded is 20 bucks.

If it can't, I'll just order the ZZP one. Checked it out and you're right on the price!

What'* the difference between magnaflow and OEM? Will I see that big a difference? (Obviously I will compared to my state right now, which is no cat at all. lol)
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Old 02-05-2011, 10:23 AM   #96
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The megnaflow has is a free flow cat, so less restriction. You will also notice a slight difference in sound. It should deepen the note a bit.
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Old 02-07-2011, 06:16 PM   #97
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Please tell me I didn't just make a big mistake.

Drove my car to muffler shop, kinda. Was on my way and it died. Pulled off...if I gave it throttle on start up I could start it, but when I put it in drive and went to go, it would die. Would not start by itself. Cranked but didn't start...

Now, 1)I had a full tank of gas and went about 70 miles on it. Could the car with the catalytic converter detached(so that the exhaust system ends right after the cat) use a full tank of gas like that?!

2)OR, since its pouring like crazy and i did go through a 3 inch flooded driveway, did I get water in exhaust? Permanent damage??

3)OR is the exhaust hole now simply too much for it to handle?

Any thoughts? Getting it towed to muffler shop in morning.
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Old 02-07-2011, 06:19 PM   #98
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Try to unplug the MAF and see if it will start up.
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Old 02-07-2011, 07:13 PM   #99
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I'vebeen driving with MAF unplugged.

I just now plugged MAF back in and was able to drive it enough to then get it to be bumped into my lot.
Bumper unclipped from side, when I finally get mechanical issue fixed ill try to clip it back. We'll see.

WHY won't it stay running now? Ughh..
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Old 02-07-2011, 07:20 PM   #100
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You dsaid you just drove threw a puddle? I would say the coils and plug wires got wet.
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