hey guys


my truck threw a code the other day, p0171, bank 1 too lean. i have definitly lost alot of power in her, and today i started smelling exhaust in the cab when i would be sitting at stop lights. today i also noticed my truck shaking more the usual when idling.

what are your guys' opinions on what it could be?

 

Maybe start with that blown plenum in your sig and clogging cat? O2 sensor may be giving up the ghost as well due to other problems there.

 

Disconnect front O2 sensor and see if it runs any better.

Check fuel pressure as well.