Hesitates when gas is floored. - Page 2 - 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 06-26-2006, 01:34 AM   #11
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also, a clogged cat will triggor the check engine light to come on, next time it comes on put a scan tool on it, if you dont know anyone with one take it to autozone, they will check it for free
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Old 06-26-2006, 01:48 AM   #12
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I'm pretty sure it is the cat at this point... if it were the fuel pump the car should start to die if I tried to give it way to much gas... or at least bog down... its more like it just stops accelerating and gradually slows like I had taken my foot off the gas... and the rpms try to go up... can feel the car trying to speed up, but it can't. Also as I said from time to time you will hear a pop come from the muffler. Gonna call a mechanic tommorow... wonder what a new cat will run? I know theyre only about 90 bucks at auto zone but the one on my car is welded on :( alot of the cars I've seen have bolt on cats
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Old 06-26-2006, 09:10 AM   #13
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Quote:
Originally Posted by FattyAzzBonneville
...... i can guaruntee
Not to say it'* not a cat, however w/o being a mechanic and running the appropriate tests, you can't guarantee a thing.

First thing to do on a car with issues is bring the general maintenance items up to par. In this case the plugs and wires were replaced and found to be in horrible condition. If they were neglected that badly, what are the chances that the fuel FILTER is also due for replacement.

The FSM points us first to general maintenance, then to further diagnosis. Don't condem the cat unless there was a bad O2 sensor previously as the O2 is the cause of 95% of all cat failures. Does the exhaust sound restricted? Does it seem to be hungry for more fuel, has the filter been neglected, could the pump be weak because of that. Has a proper test been done to justify any path or direction?

A fuel filter and pressure test gauge is around $30 and installed cat can run roughly $100~200.

The question is.. should we help diagnose this or simply shotgun this persons weekly paycheck on parts that we haven't fully diagnosed?
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Old 06-26-2006, 09:27 AM   #14
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Quote:
Originally Posted by FattyAzzBonneville
also, a clogged cat will triggor the check engine light to come on, next time it comes on put a scan tool on it, if you dont know anyone with one take it to autozone, they will check it for free
Wrong. 94'* didn't have an O2 after the cat. It will NOT trigger a check engine light.

O2 sensor will not affect WOT performance. It'* ignored at WOT by the PCM.

Check the fuel pressure, and get a backpressure test done on the cat. (assuming you've already done all the other normal tuneup items).
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Old 06-26-2006, 01:04 PM   #15
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Well after calling the mechanic I will have a fuel pressure test done. But I just bought the car and the o2 sensor looks brand new (not that it is for sure) which could indicate that it has been replaced recently but I dont know for sure
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Old 06-26-2006, 01:45 PM   #16
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Oh yeah, just thought of this and thought it might help. Sometimes I can get the engine to hit max rpms when it is in park or neutral (not often though), however it never has full power in drive. Maybe that could help determine what the problem is?
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Old 06-26-2006, 02:51 PM   #17
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You really shouldn't be free reving that high in park/neutral. And the rev limiter should be stopping you around 4K rpm.
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Old 06-26-2006, 11:04 PM   #18
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forgive me, i shouldnt of guarunteed that his cat was the problem, all i know is that his car has all of the same symptoms as mine did before i had the cat installed, when the cat was installed my car was as good as new , he should have a profesional take a look though
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Old 06-27-2006, 01:53 AM   #19
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Well the mechanic is gonna look at it on wednesday. Anyway I put a new fuel filter in it and took it for a drive and at the end of the drive I could hear a knocking type noise comming from the supercharger... Im guessing that its going out or has already died. Could the supercharger dieing cause this symtom, or is it likely that the supercharger is going out on top of whatever was wrong in the first place?

Also this is my first supercharged car. Im guessing that if the sc is out that it has to be replaced and that it cant really be fixxed? Any idea what a rebuilt sc runs? I actually got this car for $450 and it has 145k miles on it... if I could get it running right for a total of $1200 spent Id be thrilled, think thats possible at this point? I know that my last bonnie was super reliable and if not for my sister borrowing it and driving it after it had no oil pressure (oil pump went out) Im sure it would still be running strong now with its 190k+ miles, so id really like to get this one going
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Old 06-27-2006, 08:21 AM   #20
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A little rattle/noise from the supercharger isn't as bad as you think. Most likely it'* a coupler letting you know it'll want to be replaced.

The coupler, couples the nose drive (pulley end) of the SC to the rotors inside the main housing. Essentially it is a piece of hard plastic and wears a little. Many vendors sell replacement couplers for about $30, a bottle of SC oil $6-7, some GM red gasket maker and the SC to intake gaskets..and you are off and running again. Probably about $100 total.and a do it yourself project.
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