Question about Ford F-150

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2004 f150 5.4 liter has rough idle and when i punch it it sputters and pops through intake and boggs badly. do i need to check vacum problem first. then what

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Check for a Vacuum leak, Then go to Autozone or Oreillys for a free scan. You did not mention any other noises, but if you have something like a light "tap" similar to a Diesel, see if that noise goes away above 2000RPM. The engines with the DOHC emblem have a problem with "Cam Phasers" and Ford has an extended Warranty for that defect. 7 years plus limited miles, at least 75,000 to 85,000.

The popping through the Intake sounds like early valve timing. The Phasers are used to synchronize the valves on each cylinder bank. One bank may be "out of time". The repairs are expensive, but some shops have found shortcuts for replacement. The 2 Phasers alone total $500.

I hope your troubles are small. With the DOHC motors it is important to keep the oil clean and consider using a Detergent additive to protect the Phasers.

Posted on Oct 14, 2010

  • fordexpert Oct 15, 2010

    If you do not find a Mechanical problem do a fuel test for water in the gas.

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