Thread: po171 under heavy throttle

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  1. #1 po171 under heavy throttle 
    Donating Users nascartech's Avatar
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    i get the p0171 code under heavy accell wht u guys think maybe the bbv?
    01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered
    sold 97 GTP stock
    Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4
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  2. #2 Re: po171 under heavy throttle 
    Donating Users Lawngoose's Avatar
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    02 GTP 13.6 @ 100mph - SOLD
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  3. #3 Re: po171 under heavy throttle 
    Donating Users nascartech's Avatar
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    i know its a vac leak but why only under mild to
    hard accel


    Quote Originally Posted by Lawngoose View Post
    01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered
    sold 97 GTP stock
    Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4
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  4. #4 Re: po171 under heavy throttle 
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    checked for vacleak and had the car on the dyno and dyno says its running rich so the set the a/f ration to 12 and im still getting same code po171 lean bank 1 wht gives and just got a p0300 random missfire could the rich condition jave foiuled my plugs
    01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered
    sold 97 GTP stock
    Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4
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  5. #5 Re: po171 under heavy throttle 
    GT Level Member mikedinthecity's Avatar
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    mine too. doin the same thing but dunno what is causing it and the car doesnt run any different. no chugging nothing. i do not have a dyno and im not sure if mine is running rich or lean .also wouldnt a vacuum leak make your car run lean????
    2000 Daytona 500 GTP. fender well intake K&N, 180 tstat, flipped dog bones, strut2strut brace, sd headers coated n wrapped, 3in dp, 3.25 pulley, pcm tune, led tails, angel eye halos w 100 watt h1s, p&p heads, p&p m90, yella terra alum roller rockers, head studs, 8mm wires, al104s, 2007 l26, 329s hd diff, alum sub frame
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  6. #6 Re: po171 under heavy throttle 
    Turbo is the way to go. BillBoost37's Avatar
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    The O2 readings have told the pcm to richen up the mix because it was too lean. That's why the code set.

    Find your vacuum leak and don't worry about the when, worry about the what.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  7. #7 Re: po171 under heavy throttle 
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    i cant seem to find a leak sprayed brake clean everywhere and nothing happend i do have egr delete and evap code deleted and car doesnt run to bad so its a very small leak all vac lines are new wht else should i check thanks also it says bank 1 so thats the front side of the enigine right


    Quote Originally Posted by BillBoost37 View Post
    The O2 readings have told the pcm to richen
    up the mix because it was too lean. That's why the code set.

    Find your vacuum leak and don't worry about the when, worry about the what.
    01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered
    sold 97 GTP stock
    Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4
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  8. #8 Re: po171 under heavy throttle 
    I live here. SlowNA06's Avatar
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    What do your spark plugs look like? Are they lacquered, corroded, horribly out of gap?
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  9. #9 Re: po171 under heavy throttle 
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    well the front bank has new 103s i put in and the back bank has mt tr55s im changing today i wanted to see if there was a diff but if front bank is numer 1 then ill put tr55s back in and if rear is bank 1 ill put 103s in there


    Quote Originally Posted by SlowNA06 View Post
    What do your spark plugs look like? Are they lacquered, corroded, horribly out of gap?
    01 GTP is3 cam 130 springs double roller 60lb injectors lq4 maf headers 4000 stall lowered
    sold 97 GTP stock
    Sold 2001 gp gt ssm90 plog dp 3.8 208 whp 265 at the crank 14.8 1/4
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