One recent day, our 98 Explorer (4.0L SOHC) required the gas pedal be pushed to start. After starting it would die if allowed to idle down on its own. The check engine light came on in the driveway during this time as well. (Prior to this day it had been idling a bit rough when sitting in park but it never died.)
I removed the mass air flow sensor and cleaned the wires with MAF sensor aerosol cleaner from the parts store. After cleaning, allowing to dry, and reinstalling, the explorer started right up with no need for the gas pedal. It also settled in at a nice steady idle around 700rmp or so. We ran it for a while. Shut it down and restarted several times and everything seemed to be fine. (I also disconnected & reconnected the battery. The CEL went away.)
Later that same day, it would not start again without the gas pedal being used (significantly). It now also dies immediately when the pedal is not used.
I removed the MAF and cleaned it again. No difference. I also then removed the IAC and cleaned it. No difference. I've looked all over to make sure there are no loose hoses.
Sure could use some help with ideas about what to do next. I'm considering buying a new MAF sensor and replacing it. Is it possible that after cleaning and running properly for a bit, the MAF could have gone bad altogether? (The CEL has not yet re-appeared, even after keeping it running in the driveway long enough to get it completely warmed up.)
Thanks very much.
Tuesday, January 1st, 2013 AT 7:31 PM