Thread: po171 under heavy throttle

Vac Leak?

http://www.grandprixforums.net/vaccum_leaks.php

i know its a vac leak but why only under mild to
hard accel

Originally Posted by Lawngoose

Vac Leak?

http://www.grandprixforums.net/vaccum_leaks.php

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