Roy: I thought I had this fixed many months ago but the lean demon is back. LTFT bank 1 = 2.3 ( LTFT bank 2 = 23.4 ) I'm leaning towards the fuel injector as the enemy lean condition. The last full scan tool freeze frame details are as follows : calculated load at 48.6% coolant temp 201 STFT bank 1 minus -3.9
LTFT bank 1 2.3
STFT bank 2 26.6 LTFT bank 2 23.4
Engine speed 1973 RPM
vehicle speed 62 MPH. Vehicle has been smoke tested for vacuum leaks at motor, exhaust and evap with no leaks detected or bad deteriorated vacuum hoses found. First threw the p0153 and then a few days later the p0174 was present on scan tool Both codes are confirmed by scan tool. Removed front 3 spark plugs I noticed cylinder 4 piston head was dry and #2 and #6 were showing fuel. So I'm speculating that fuel injector #4 is dirty, intermittent or on its way out. It has a terrible intermittent erratic idle that sometimes almost shuts off the motor and then recovers fast to a normal idle. I'm leaning toward the injector or injectors as I have covered all other diagnostic tree paths. Fuel pump is new and MAF, IAC sensors are good.
Sunday, June 6th, 2021 AT 3:52 AM