Thread: p0171 code, AEM WB reads good AFR

I have a p0171 code that keeps popping back up. my wideband afr reads normal, not running lean. i just had my heads ported and polished at my local machine shop. they did a pretty good job and didnt open them up too much from what i could see. ive checked for vacuum leaks, nothing. i replaced my front o2 sensor, nothing. still have to try the egr tube. does anyone know if the ported heads could be causing this problem?

Originally Posted by JayGTP02

I have a p0171 code that keeps popping back up. my wideband afr reads normal, not running lean. i just had my heads ported and polished at my local machine shop. they did a pretty good job and didnt open them up too much from what i could see. ive checked for vacuum leaks, nothing. i replaced my front o2 sensor, nothing. still have to try the egr tube. does anyone know if the ported heads could be causing this problem?

You need to scan your Lft's Id be willing to bet there 16.4 Showing more then likely you have a vac leak