2000 mustang with 102k on it. It ran pretty good, but was starting to get a little rough idle and it wasnt as smooth as the RPMs increased.
I changed spark plugs (used Motorocraft AGSF42FM) and installed new plug wires (NAPA Belden, since stupid Ford dealer sold me the wrong Motorcraft part number, and it was weekend and couldnt wait till Monday). I have triple checked the spark plug wire routing and it is correct.
At the same time I changed the plugs and wires, I also cleaned the MAF sensor using MAF sensor cleaner. I removed the MAF again and it appears to be in good condition, no damage to the MAF sensor wires.
Upon starting the car, it runs extremely rough and won't idle. If I push the gas pedal it will run at higher RPMs. It seems to smooth out a little at higher RPM - but still not running the way it should be. Once you let it go back to idle, it will typically die. It runs rough like some slight backfiring and dieseling.
In order to facilitate changing the plug wires, I unbolted the upper intake plenum. This allowed me to get to the plug wires behind the intake.
The car isnt really setting any codes. It set P0151, which led me to believe the coil pack got fried somehow during the work. I checked the coil using a plug and wire connected to each coil tower. It had a hearty spark on every tower.
After clearing the 151 code, it has not reappeared (car hasnt been driven). As a point of reference, the P0151 code was NOT present prior to changing the wires/plugs.
The plugs I removed from the vehicle were very worn.
What could this problem be? This is very frustrating.
I changed spark plugs (used Motorocraft AGSF42FM) and installed new plug wires (NAPA Belden, since stupid Ford dealer sold me the wrong Motorcraft part number, and it was weekend and couldnt wait till Monday). I have triple checked the spark plug wire routing and it is correct.
At the same time I changed the plugs and wires, I also cleaned the MAF sensor using MAF sensor cleaner. I removed the MAF again and it appears to be in good condition, no damage to the MAF sensor wires.
Upon starting the car, it runs extremely rough and won't idle. If I push the gas pedal it will run at higher RPMs. It seems to smooth out a little at higher RPM - but still not running the way it should be. Once you let it go back to idle, it will typically die. It runs rough like some slight backfiring and dieseling.
In order to facilitate changing the plug wires, I unbolted the upper intake plenum. This allowed me to get to the plug wires behind the intake.
The car isnt really setting any codes. It set P0151, which led me to believe the coil pack got fried somehow during the work. I checked the coil using a plug and wire connected to each coil tower. It had a hearty spark on every tower.
After clearing the 151 code, it has not reappeared (car hasnt been driven). As a point of reference, the P0151 code was NOT present prior to changing the wires/plugs.
The plugs I removed from the vehicle were very worn.
What could this problem be? This is very frustrating.
