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po171 under heavy throttle



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
 
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????
 
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 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


BillBoost37 said:
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.
Click to expand...
 
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


SlowNA06 said:
What do your spark plugs look like? Are they lacquered, corroded, horribly out of gap?
Click to expand...
 
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