Stuttering, lack of power problem... - Page 6 - 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 11-25-2006, 06:17 PM   #51
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Intake cleaner, sensor safe for the IAC. You should remove the TB from the car per Techinfo to do that so you can clean the IAC seat.

You need to clean that throttle plate as well. If it carbons up to where it doesn't close correctly, un-metered air enters at idle, and the IAC can't compensate enough. I'd be looking at air delivery. IAC, TB cleaning, vacuum leaks.
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Old 11-25-2006, 08:30 PM   #52
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I'll give that a try one afternoon here. A lil cold out tonight, gotta work all day tomorrow and too much school to deal with the first half of this week. Picked up a TB gasket and some TB cleaner, "Safe for O2 Sensors and Catalytic Convertors."
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Old 11-27-2006, 09:19 AM   #53
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It certainly can't hurt to clean that TB if it'* never been done before. Here'* what they can look like before cleaning:

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Old 11-27-2006, 04:01 PM   #54
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I cleaned the TB back when I replaced the UIM about 3 years/35K miles ago. It was bad, before that happened I had been feeling some resistance in the gas pedal, which was from the gunk sticking to the TB plate. However, I dont think we cleaned the IAC.

I was thinking about putting the FPR on hold for now, or do ya'll think it'* a good idea to replace it. It couldn't hurt I guess.
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Old 11-27-2006, 04:34 PM   #55
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Sorry I'm so late to this party, but...lglarum, when the UIM was replaced, were the lower intake manifold gaskets replaced, too? They get old and create vacuum and coolant leaks that can make your engine run poorly. A loss of coolant with no external leaks visible would be one symptom of a coolant leak at the LIM gasket; another would be white smoke or sweet smell at the exhaust. Another possibility is that someone did not replace your PCV valve or the lower o-ring on your PCV valve when the UIM was done.

When the engine is running poorly, open the oil filler cap and put your hand on the hole. Is there a noticeable vacuum? Does the idle quality change? If so, check the PCV and o-ring. If they are OK, you may have a vacuum leak at the LIM gasket.
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Old 11-27-2006, 04:51 PM   #56
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I'm pretty sure the PCV and the LIM gaskets were replaced when we did the UIM. There'* no vacuum at the oil cap either.
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Old 11-27-2006, 04:57 PM   #57
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Quote:
Originally Posted by lglarum
I'm pretty sure the PCV and the LIM gaskets were replaced when we did the UIM. There'* no vacuum at the oil cap either.
Well, it'* good that there is no vacuum at the cap. And new LIM gaskets is more good news. Two more possibilities checked off.
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Old 11-27-2006, 05:38 PM   #58
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Quote:
Originally Posted by bill buttermore
Quote:
Originally Posted by lglarum
I'm pretty sure the PCV and the LIM gaskets were replaced when we did the UIM. There'* no vacuum at the oil cap either.
Well, it'* good that there is no vacuum at the cap. And new LIM gaskets is more good news. Two more possibilities checked off.
So would it be a good idea to just replace the FPR and be done with it since I can get a fairly good deal on it?
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Old 11-27-2006, 05:40 PM   #59
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Depends on what your fuel pressure is.
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Old 11-27-2006, 05:53 PM   #60
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Quote:
Originally Posted by willwren
Depends on what your fuel pressure is.
I guess that makes sense... Chilton'* says 48-55 psi after running the fuel pump prior to starting and 3-10 psi at idle. I'll get that done next then.
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