i have a 2000 s10 with major issues, it seems to hesitate very badly, anything over 1/3 throttle is useless. the truck threw up 2 codes, p0101 and p0440, a maf code and a evap code, every time they come on at the same time. i have noticed while watching the scan tool my maf moves in relation to engine rpms which seems good, tps test out fine and map seems to be working good, only thing that looks suspicious to me is the ignition advance, at idle its close to thirty but as i increase throttle with it under load it tends to drop around 10 or below, i assumed advance would go up with rpms, not down. truck has new fuel pump with good pressure, and a fresh tuneup, it has been running like this for a long time, i just acquired the truck. sorry for the long post but im starting to get lost on this, im not sure what is common between the 2 codes, and the whole ignition advance, not sure if this is my culprit and what would be causing it. knock sensor maybe. well thanks in advance.
Jul 2, 2009 at 7:42 PM