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2003 Ford F-150 Sputter on Aceleration

Tiny
WNBERNARD
  • MEMBER
  • 2003 FORD F-150
  • V8
  • 2WD
  • AUTOMATIC
  • 77,000 MILES
I have a 2003 F-150 that appears to run fine at slow speeds and when cold. Upon acereration to freeway speeds it will sputter and quit when it gets to cruising speed. As I acelerate to pass it will sputter again. It seams to increase as the engine heats up. The Service engine soon light came on the day after it started to sputter. I've changed the fuel filter and pulgs but it still occurs. Could this be an injector issue?
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Wednesday, December 9th, 2009 AT 10:30 AM

3 Replies

Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Instead of guessing on parts use the check engien light to your advantage. Take it and get it scanned and post the code back here then we can talk!
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Wednesday, December 9th, 2009 AT 9:04 PM
Tiny
WNBERNARD
  • MEMBER
  • 2 POSTS
The code is PO304:
Misfire detected in the #4 Cylinder. After having it read, I pulled the plug again and replaced it and the spring and rubber cover. The problem still persist.
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Sunday, December 13th, 2009 AT 6:01 PM
Tiny
BLACKOP555
  • MECHANIC
  • 10,371 POSTS
Switch the plug. Wire, coil with the #1 cylinder. Reset code and see what happens. See if it switches to the #1 cylinder.

#4 is driver side second one back by the way
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Sunday, December 13th, 2009 AT 6:37 PM

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