1999 Mercury Cougar, 2.5L V6, AT, 190000 miles
No MIL or DTCs present :-(
Throttle is NOT mechanically sticking. For some strange reason Idle Air Control valve is still being commanded open after I let off the throttle when driving down the road (I disconnected cruise control cable to eliminate it as problem). ODB-II sensor scanning while driving indicates "Calculated Load Value" sticks at around 80% whenever problem occurs. Air box is cracked above filter, but MAF sensor readings appear to be reasonable so I don't think it is significantly damaged by contamination (engine will run poorly if I disconnect MAF sensor).
No MIL or DTCs present :-(
Throttle is NOT mechanically sticking. For some strange reason Idle Air Control valve is still being commanded open after I let off the throttle when driving down the road (I disconnected cruise control cable to eliminate it as problem). ODB-II sensor scanning while driving indicates "Calculated Load Value" sticks at around 80% whenever problem occurs. Air box is cracked above filter, but MAF sensor readings appear to be reasonable so I don't think it is significantly damaged by contamination (engine will run poorly if I disconnect MAF sensor).
Aug 1, 2007 at 1:58 PM