#4 cylinder issue on 1999 Expedition

1999 FORD EXPEDITION
135 MILES • V8 • 2WD • AUTOMATIC
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SHANE24
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  • 1 POST
last week i had a obd 0304; #4 cylinder misfire on my 1999 ford expedition. i did a complete tune up changed the plugs and replaced the coil pack on the #4 cylinder. a few days ago i got a new obd 0354; ignition coil D primary/ secondary curcuit. What does this mean? My expedition is still misfiring.
Feb 27, 2011 at 1:27 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Misfiring at cylinder no.4 Check the no.4 plug gap and also test the coil on no.4 though its new and also the wiring harness to the COPS for damage-Additional Possible Causes: Open or short in the Ignition START/RUN circuit
Open coil driver circuit
Coil driver circuit shorted to ground
Damaged coil
Coil driver circuit shorted to VPWR
Feb 27, 2011 at 1:46 AM
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