Thread: Hi I'm new and have a p0171 code, can you help?

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  1. #1 P0171 back again!!!! 
    Donating Users falconjohnd's Avatar
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    New EGR Tube, new TB gasket, new pcv valve, new fuel filter and a dose of techron to clean up any dirty injectors, and new MAF sensor and the code keeps coming back for more...... aggravation that is! If it's a vacuum leak it's a real small one because carb cleaner isn't affecting the idle. I don't believe it's the fuel pump car runs very well. Anybody got something new?
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  2. #2 Re: P0171 back again!!!! 
    Florida Tuner Z34Phoenix's Avatar
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    can you get a data log? have you tested fuel pressure? have you checked the fuel pressure regulator?

    96 Z34 (RIP LQ1 14.81@92.3) L36 Swap 14.9@91.5 www.cardomain.com/id/z34phoenix
    Topswap: P&P All,Si Valves,L76's,LW Pushrods,SD's,DHP PT PB 13.91@99.8
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  3. #3 Re: P0171 back again!!!! 
    GTX Level Member Deimos's Avatar
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    fuel too lean possibly an 02?
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  4. #4 Re: P0171 back again!!!! 
    Donating Users falconjohnd's Avatar
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    Had the car smoke tested. They are telling me my throttle body and upper intake manifold gasket are leaking....... I'm waiting on a new TB to arrive and I guess I'm doing a whole new gasket set might as well since the LIM is failure prone with the mileage on this car. Never took out a fuel injector though... I watched the video on this board good stuff but how do you take the injectors out?
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  5. #5 Re: P0171 back again!!!! 
    Florida Tuner Z34Phoenix's Avatar
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    They just pull out once u unbolt the fuel rail. I would buy new injector o rings just to be safe too.

    96 Z34 (RIP LQ1 14.81@92.3) L36 Swap 14.9@91.5 www.cardomain.com/id/z34phoenix
    Topswap: P&P All,Si Valves,L76's,LW Pushrods,SD's,DHP PT PB 13.91@99.8
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  6. #6 Re: P0171 back again!!!! 
    Donating Users falconjohnd's Avatar
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    got em thanks.
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  7. #7 Re: Hi I'm new and have a p0171 code, can you help? 
    Donating Users falconjohnd's Avatar
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    Well after two days work, yes two days! she's all back togather. I'm glad I changed LIM gaskets because they were toase. No water in oil amazing. Very clean car internally, no sludge or chocolate brownie inside the valve covers! I think I broke the vacuum hose that goes to the MAP which I'll replace or splice today. DuBob's video was great! Hopefully MIL will stay off now!
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