No power at WOT - 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 01-20-2006, 03:41 PM   #1
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Default No power at WOT

'92 SSEI with 179,000 miles
This all started earlier this winter (after using some gas additive for a while - which may be a coincidence). I would be driving down the road and mash the pedal. I would get no downshift and when the car was warm it would sputter and give me nothing. At one time the car even died. My first thought was fuel pump, even though I changed it last summer. I haven't had the pressure checked yet.

Anyway, I thought maybe the filter is clogged from the additive (cleaner), so I changed the filter. That seemed to help some but I still do not get any real power at WOT. My boost gauge shows ful boost (10+PSI) and I do start to accelerate after a time, but I never do get a kickdown - much like it doesn't recognize I've opened it up. Sometimes at higher speeds it will kickdown, but only after a lag of some seconds.

I also changed the spark plugs in hopes that it might help. Three of them were of questionable condition.

Does anyone have any other ideas of what could be causing this? How would I test those ideas? I suppose I need to check on the fuel pressure. I understand that if it drops below 40 psi at WOT, it means there is a fuel pump problem, correct? I am not real excited to go back into the tank. I'll have to wait for better weather fo that, if needed. It'* too cold here at the moment. That'* why I would like to eliminate any other possibilies first. Thanks in advance.
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Old 01-20-2006, 03:48 PM   #2
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what voltage do you have on your TPS at idle and WOT?
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Old 01-20-2006, 06:08 PM   #3
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0.428V idle to 4.33V WOT
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Old 01-20-2006, 06:32 PM   #4
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You mention changing the plugs. How old are the wires and what brand are they?
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Old 01-20-2006, 06:39 PM   #5
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I think the wires are original, but I am not getting the problems like misfires that bad wires would cause. I just don't seem to have the power I once did. That'* why I lean to fuel problems. I don't have a fuel pressure gauge. That'* why I havn't checked the pressure.
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