No power, LOUD CAI until 3/4 throttle - Page 3 - 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 12-15-2005, 08:48 PM   #21
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Thanks Ill give it a try when I get time.
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Old 12-16-2005, 05:13 PM   #22
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Well, I took some time yesterday and played with my car a bit. Turns out, it'* probably NOT the EGR valve. I was sure of it because it ran better with it unplugged, but after I took it off the check the movement of the pintle, I found that it moved very smoothly and since the SES light never came on, I doubt that it'* an EGR solenoid issue. The gasket had one spot that was burned through, so I replaced that (not that it would really make a difference, but since it was something that wasn't right, I just fixed it). Put everything back together, and everything runs the same -- poorly. My next guess is that maybe the TPS is failing, but I don't have my multimeter at home, so I can't check it. I'll be going to my shop in St Cloud on Sunday, and my scantool is up there, so I can actually do some serious diagnosing. I'll keep this thread updated, more as reference for anybody else with this issue than anything else.

Also, something else I noticed...I had been hearing a strange noise (I wouldn't really call it pinging, but close to that) when getting on the gas. I drove to Cornell College in Iowa (where I am right now) and stopped for gas in Iowa. 89 octane is cheaper than 87 in Iowa (something to do with the gov't, I don't remember exactly what it is), so I filled up with 89 and my car runs better and that noise isn't nearly as obvious as it was before. So....I'm assuming I have some carbon buildup, but that still doesn't explain my drivability issues. I don't beleive it'* a bad gas issue since I've gone through multiple tanks of MN gas, this higher octane in Iowa issue is intriguing. Any thoughts?
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Old 12-23-2005, 06:50 PM   #23
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FINALLY -- it'* fixed.

My cat was clogged. Why my car would actually move at 3/4 throttle is a little strange, but I don't really care right now. I put in a straight pipe, and she'* all better.

As an added bonus, my car finally sounds f'n MEAN

SWEEEEEEET I'm happy.
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Old 12-23-2005, 07:00 PM   #24
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Quote:
Originally Posted by CSFiend
I put in a straight pipe, and she'* all better.
There you go guys! Who wants the $250?
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Old 12-23-2005, 08:01 PM   #25
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Quote:
Originally Posted by willwren
Quote:
Originally Posted by CSFiend
I put in a straight pipe, and she'* all better.
There you go guys! Who wants the $250?
He'* got the good original one off my 95 coming to him tomorrow when I meet him -he'* buying the GP STB (for his GF'* GP GT for Christmas) I bought in anticipation of buying a GTP last summer.
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Old 12-23-2005, 10:08 PM   #26
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So we have only one or two days to nail him to the wall for the Xmas bonus?
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Old 12-23-2005, 11:23 PM   #27
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You know, I debated adding this but figured it wouldn't be required. I've been proven wrong.

I only put the straight pipe in as a temporary fix, I needed something that would drive (I've been driving my Dad'* 89 Civic, but it doesn't fit all the computers I usually carry around). The high flow cat is already on order. So PPPBHHHHHHH :P
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Old 12-24-2005, 02:54 AM   #28
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Quote:
Originally Posted by CSFiend
You know, I debated adding this but figured it wouldn't be required. I've been proven wrong.

I only put the straight pipe in as a temporary fix, I needed something that would drive (I've been driving my Dad'* 89 Civic, but it doesn't fit all the computers I usually carry around). The high flow cat is already on order. So PPPBHHHHHHH :P



On a serious note, I think you gained performance by deleting, but only because it was clogged to begin with.

When you get a cat back in there, you'll see (feel, you drunk) a low-end torque gain, particularly on an L27.
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Old 12-24-2005, 03:33 AM   #29
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But will the incredible power gains in the high end still be there as well?
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Old 12-24-2005, 03:34 AM   #30
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Yes, and you didn't really gain those anyway. Compared to a CLOGGED cat, you did. But that happened so gradually, you didn't notice you were losing it. A hi-flow cat is less of a restriction than your stock piping.
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