Misfire problem

FORD F-150
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ROBBJUD
  • MEMBER
  • 3 POSTS
Have a 2003 Ford F-150 truck with 61,000 miles on it. Has the Triton V8 engine. About 1000 thousand miles ago it had service engine light come on. When it came on I noticed a momentary hesitation and no other problem. Checked code was a cylinder 1 misfire. No problem existed until now and it started running funny and light came on again. This time the code is for a cylinder 4 misfire. Not being very familiar with electronic ignition I am at a loss as to where to start. Any help appreciated.
Mar 10, 2006 at 12:49 AM
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PEPPERMRJ
  • ✓Experienced Mechanic
  • 1,158 POSTS
Pretty simple system. COP (coil on plug) has 1 coil on each plug. You could have a fouled plug or bad coil. If I rember correctly # 4 is ubder a heater hose that has a tendency to leak and create problems. Bad news is that the plugs on these engines are a PITA to get to.

Good luck and let us know. :)
Mar 11, 2006 at 12:26 PM
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ROBBJUD
  • MEMBER
  • 3 POSTS
Yea replaced the plugs. What a PITA as you said. Anyway problem is resolved. thanks
Mar 12, 2006 at 12:56 PM
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2CARPRO BOB
  • ✓Experienced Mechanic
  • 45 POSTS
If your problem reoccurs, now that you have replaced the plugs, your coils on cylinders (the ones that showed the misfire) 1 & 4 will need replacing.
Mar 26, 2006 at 12:48 PM
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