loss of power - 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 07-12-2009, 02:36 PM   #21
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no much to see cleaned most of it out . kind of thinking somebody had trouble with the o ring and put some oil on it but to much. the pcv valve was like some was poured into it . have never seen one like this before
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Old 07-13-2009, 05:36 PM   #22
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ok here'* what i found out today . where the map and pvc valve are there is no seal for the bottom of the pcv and wrong pcv valve and no spring to hold valve down under the cap . car to hot right now to change it . as soon as i do will report the out come . who ever replaced the manifold before must not have had a clue . i didnt know what was missing till i looked at work today. this is my first car with this type of manifold.
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Old 07-13-2009, 06:01 PM   #23
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Wow.........good eye man!!

That would have to be part of the problem your going through if not the whole problem right there.

Great work on finding that!

Let us know........
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Old 07-13-2009, 09:24 PM   #24
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got all the new parts in. runs way better but i still have vacuum trouble under a hard pedal not as bad as before . i wonder if i need a new map that the other is fixed the map looks like the one from the factory.
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Old 07-14-2009, 10:09 PM   #25
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put in new map helped more but still haven't got it all worked out yet . the whole problem is no codes to help out at all.

Last edited by Toddster; 07-14-2009 at 10:11 PM. Reason: spelling
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Old 07-18-2009, 07:49 PM   #26
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put in a new crank sensor i had in lying around . starts better the one the was in there was some cheap one . not well made. found my vac leak the line running to the vac tank broke behind the battery in the loom. it was tape to the loom so was hard to find. but still have my loss of power after the car is fully hot . but its not every time so going to back to alldata and read some more maybe i missed something on this problem
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Old 07-23-2009, 12:23 AM   #27
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mine is acting very similar... had the same very large amount of oil on the pvc. also have the vacuume issue under hard to decent throttle and it all just goes to the defrost.. ive went through all my vac lines fixed replaced. maybe im still missing something but your not alone.. i had a intense pcm in and have now swapped the stock on i and its saying pcv and tps so see how those 2 check out...
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Old 07-23-2009, 07:18 AM   #28
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the only thing not new is o2 sensors and intake manifold and fuel pressure regulator that was replaced under warranty cant remember when for sure think it was 15000 mi. car has 189000 now. the intake has been changed before date code on it is 05. i found one vac leak where the vac runs to the dash and down to the vac tank that line was broke behind the battery in the loom that was fun to find. spliced with new hose.

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Old 07-23-2009, 07:36 AM   #29
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Did you say that you did check the vacuum canister under the front right fender?

Do me a favor check that out, when you find it carefully pull the vacuum line off of it. Do you hear a quick hissing sound indicating that there is vacuum pressure?
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Old 07-23-2009, 08:09 PM   #30
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will try that havent done that since i fixed vac line to it
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