1998 Ford Expedition engine runs rough during acceluration.

Tiny
CKULA
  • MEMBER
  • 1998 FORD EXPEDITION
  • V8
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Hello, 1st I changed fuel filter. Then was told this car hasnt ever had a tune up? 2nd changed spark plugs.
Ran great for two weeks then problem came back, pulled trouble codes said miss fire in cyl. 3 swaped coil pack with cyl. 1 that cleared codes ran fine for a few days. Now problem came back worse, Im at a loss today the check engine light finally came on. What should I do next? I finally beleive the problem is circled and highlighted blue!
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Sunday, July 12th, 2009 AT 9:01 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,005 POSTS
IF the check engine light is on, you need to scan it again to see if the problem has changed. The coil pack may be weak or I have actally seen the rubber boot on the coil pack burn through allowing the spark to short out on the inside of the valve cover resulting in a miss. Did you check the rubber boots for any signs of this? Usually there will be a gray spot where the spark arks through. Give that a check to see if that is the problem. Believe it or not, it is more common than many know. Most mechanics will say you need a new coil pack when only the boot is bad.
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Thursday, July 16th, 2009 AT 11:02 PM

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