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P0171 and P0174

This is a discussion on P0171 and P0174 within the General Help forums, part of the LSx Technical Help Section category; Originally Posted by LSCyaL8R on another note. how much timing advance do these cars run typically? my car seems to ...

  1. #21
    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    Quote Originally Posted by LSCyaL8R View Post

    on another note. how much timing advance do these cars run typically? my car seems to be running between 20-40 degrees while driving. i didn't log any data so i can't peek at what it does at WOT.... Also can't get any readings from the knock sensors... methinks that the included PID's for them must be wrong. Although it's entirely possible it's user error on the new software. lol
    You don't want a reading from the knock sensors...knock is bad. 0 degrees knock retard is desired.

    Here's a chart showing a typical LS1 spark advance vs. rpm and load:


  2. #22
    Chief of his tribe! LSCyaL8R's Avatar
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    little update for anyone that was paying attention. I haven't logged too many miles since all this but decided to try something yesterday. I had the check engine light go out once during all this only for it to return. yesterday i decided... hmmm let's try cleaning the maf. so i opened it up as i was heading out and realized i didn't have the little tube for the carb cleaner and it's set in there pretty deep... oh well i'm in a rush and want to try this. Hit it as best i can and button everything up and start driving. hmmm... idle seems to be more stable.... hmmm the hesitation i had started to notice at 2,500 RPM is gone.... later on... oh look the check engine light is gone! fingers seriously crossed that this was the issue and that all is well.

    oh... and the moral of the story.... clean your MAF!!!

  3. #23
    Member Eganslp's Avatar
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    Quote Originally Posted by 35th-ANV-SS View Post
    I am with Cutlass...vacuum leak. Spray around the intake and sealing surfaces with some brake cleaner and see if the engine idle changes. If it does, you found where your leak is.

    Your codes are for BOTH banks, which is almost always indicative of a vacuum leak.

    I had these codes on my 3800-II and the intake was leaking at the gasket.
    NOOO!!!! Do not spray brake clean!!!! I did that to mine and it forms white residue spots all over the blk. polymer intake & other plastics plz trust me on this and don't do it when I get my car back from the trans shop I'll take pics. Of what it did to mine


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  4. #24
    Moderator 35th-ANV-SS's Avatar
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    Never thought of that. I used that method only on my other cars which have an aluminum intake.

    Did you let it dry on there? Or did you wipe it clean after spraying?

  5. #25
    Member Eganslp's Avatar
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    Sunset metallic orange
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    Quote Originally Posted by 35th-ANV-SS View Post
    Never thought of that. I used that method only on my other cars which have an aluminum intake.

    Did you let it dry on there? Or did you wipe it clean after spraying?
    I wiped it off, but you know how you spray it and some of sorta dries on contact not all of it. Well I'm guessing the parts that did dry quick must have turned it white I even hosed it down afterwards but idk it's a good thing I'm getting the new fast 102mm & paint the old one back to black selling it.


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