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.

help!!! P0171 never ending battle

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Old 04-11-2008, 12:12 AM
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hey tech ted i havent gotten an email yet just curious if you got pm or not
Old 04-11-2008, 10:14 AM
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Sorry for the delay - they're on the way.
Old 04-14-2008, 11:05 PM
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sorry for the being the bringer of old topics but i would like to know now that i have cleaned the ground from battery-to-block and power-to-starter/alternator and the power to fuse block
did i miss any of the obvious grounds or power connections posibly one for sensors seeing as how i think this is the ever so common electrical related lean bank

is it worth replacing the IAC, or the MAF i do have a slightly rough idle and when i cleaned the two of them the MAF was fine just dirty and i did the hit test on it and it was fine and the connector test and it instantly threw the code but when i cleaned the IAC it was terribly dirty and when i tried adjusting it... it sperated the plunger from the motor piece but it fight back together again and was very stiff is that normal or not?

i really want to get this issue under control and i cant get it figured out for the life of me i need guidence on this one.
Old 04-15-2008, 08:38 AM
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Jumping in sideways for a minute. On those grounds, you should also have some others at:
    I saw some discussion about vacuum earlier. If you get desperate, you can eliminate possibility of vacuum causing it, if you block ALL your vacuum inlets at the vacuum tree. You probably could not test drive it this way, but could clear the code and see if it comes back just idling and revving, etc, in Park. Of course, if it is still there, you can concentrate on the other stuff.
    One last note; had one member who was running lean and finally found a bad brake booster as the culprit. Yeezch!
    I'm back out of here.
    Old 04-15-2008, 02:13 PM
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    i had the same code i checked everything like you. it turned out to be a vacuum leak. i smoked the system all lines were connected but it was coming out the small *-hose on the supercharger.
    Old 04-15-2008, 08:22 PM
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    tahnks for the thought redsled i noticed your thread and checked it out but on 96 the batt to motor ground is on the front of the block under the first cylinder and i did not notice any grounds heading towards the ICM
    Old 04-16-2008, 01:41 AM
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    Didn't the scans help at all?

    This problem should fall into one of these three categories.

    1- Bad MAF
    Did you try unplugging it? Wasn't that one of the steps in the manual?

    2- Lack of fuel
    Even though the pressure checked good it could be dropping off as the injectors use more fuel. Has the fuel filter been changed? The fuel pressure regulator has a screen that may need cleaning. Have you tried any fuel injector cleaner?

    3 - Vacuum leaks
    Did you try spraying throttle body cleaner on all the vacuum lines & fittings? Try disconnecting the vacuum line from brake booster & plugging it. If you need to go for a test drive with the booster unplugged then start out very slow & try stopping. It'll take a lot more force on the pedal to stop. Some have had good luck by using cable ties on the vacuum lines. See pic.

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    Old 04-16-2008, 11:39 AM
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    Originally Posted by tan96ssei
    tahnks for the thought redsled i noticed your thread and checked it out but on 96 the batt to motor ground is on the front of the block under the first cylinder and i did not notice any grounds heading towards the ICM
    A '96 should have a ground under the ICM attached to the ICM mounting stud, if not then you have found a problem.
    Old 04-16-2008, 12:01 PM
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    x2. It is a normal sized, smaller black wire coming out of the loom. Don't leave home without it.
    Old 04-20-2008, 07:27 PM
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    grounds there and clean i went through the check list and still got a code im really concerned and not sure why but my mind keeps going back to the fact that my exhaust is high flow all around cat and muffler


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