Thread: P0171 Code LTFT Maxed @ Idle

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  1. #141 Re: P0171 Code LTFT Maxed @ Idle 
    SE Level Member charlieRobinson's Avatar
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    I found my first exhaust leak, coming from front exhaust manifold, with a piece of garden hose a few feet long. Used like stethoscope. Worked PERFECTLY.
    1999 Buick Riviera - L67
    PLX wideband +HPT pro +X-P HOT cam, 140#springs, 2x chain, LS7 lifted
    ZZP SS Headers + 3" Downpipe + 200 Cell Cat.+ Aero Resonator
    Gen V swapped L67, 60# injectors, E85, N*&LQ4MAF
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  2. #142 Re: P0171 Code LTFT Maxed @ Idle 
    GTX Level Member dbextreme's Avatar
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    I may use the nitrous. Stick the feed line up the throttle body, turn the bottle on and see where she smokes from. LOL Might be the best fogger ever...

    Charlie, I'm with you. I'm sure mine's in the exhaust somewhere. I need to find good band clamps, the autozone ones do not clamp very well on the small end. Cheap crap...
    1999 GPGT - L26, Ported Top Swap, XP Cam, 3.2 MPS, 42.5#, N*, LQ4, SD Headers, Double Roller, TEP Race Trans w/Stand alone Cooler, Precision Industries 3000RPM Stall, 75 Shot Nitrous Express Proton Kit w/Purge, 3" Dual Borla Pro XS, Corsa Dual 3.5 Tips, 5% Tint
    1995 Firebird Formula - Under the Knife
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  3. #143 Re: P0171 Code LTFT Maxed @ Idle 
    GT Level Member 97gtp01gt99gt's Avatar
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    So I'm dealing with the p0171 code and the left is 16.4 and my soft is 20.3 switched all the vacuum lines to silicon and sprayed all around the SC ad can't find a leak mods are wizaired cai box 3.6 pulley SD headers and zzp exhaust system looking to get fixed going to order a smoke machine to help diagnosis leaks also gen v blower swap don't knowif I have the vacuum routing right
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  4. #144 Re: P0171 Code LTFT Maxed @ Idle 
    GTP Level Member wowitsfast's Avatar
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    What year is the gp your working on because the vacuum lines vary.

    I've Frankensteined mine so if I ever sell it the new owner will have no idea what to do lol

    Sent from my SM-N920V using Tapatalk
    Last edited by wowitsfast; 03-27-2019 at 10:59 PM.
    Just a bunch of junk thrown together http://www.grandprixforums.com/membe...ht=wowitsfasts
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  5. #145 Re: P0171 Code LTFT Maxed @ Idle 
    GT Level Member 97gtp01gt99gt's Avatar
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    It's a 04 mc with l67 did the gen v swap
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  6. #146 Re: P0171 Code LTFT Maxed @ Idle 
    GrandPrix Junkie SgtMarshal's Avatar
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    did you block off the evap port on the blower?
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  7. #147 Re: P0171 Code LTFT Maxed @ Idle 
    GT Level Member 97gtp01gt99gt's Avatar
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    Yes its blocked
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  8. #148 Re: P0171 Code LTFT Maxed @ Idle 
    GT Level Member 97gtp01gt99gt's Avatar
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    Believe I have the routing right using the gen 3 evapthink I messed up the TB adapter plate might not be snug on there
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