I am having trouble with a P0171 (bank 1 too lean) code. I had tried smoking system and have not found anything. When I spray brake clean into snorkels or maf or any parts with vacuum it’s difficult because everything is so close to the MAF to where it doesn’t give me an accurate reading. I have already changed out both o2 sensors and new MAF sensor but no matter what light keeps coming back. Any advice? Thank you
Acallll
Welcome to the forum. Sometimes using a smokemachine to determine vacuum leaks can be difficult, if the leak is small or in a place that’s ot easily visible. Another technique, at least regarding vacuum hoses, is to pinch each of the ones you see, when the engine is warmed up, to see if any change the idle rpm. Do you have a scanner? A scanner would give you real time info (for the MAF and O2 cycling) to help see where the issue lies. Understand as well that the MAF, O2, coolant temp sensor, and other sensors send their signal to the computer is wiring, so it could also be that the sensors are good, but the wiring from them is compromised.
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