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2007 Ford Expedition No power.

Tiny
RABOND
  • MEMBER
  • 2007 FORD EXPEDITION
  • 5.4L
  • V8
  • RWD
  • AUTOMATIC
  • 145,000 MILES
Truck suddenly has no power under load. Starts fine, idles good. Plugs, coil pak and fuel filter all changed. Under load the timing swings way negative. No CEL or codes indicated
Wednesday, July 29th, 2015 AT 8:58 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it. Checkfor a vacuum leak also.
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Wednesday, July 29th, 2015 AT 12:38 PM
Tiny
RABOND
  • MEMBER
  • 2 POSTS
Done 72psi and no vacuum leaks.
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Wednesday, July 29th, 2015 AT 1:48 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check with key on engine off it should be 62psi it may be a bad regulator. Are you sure there are no codes? If the timing is going negative and I don't know how you can see that without a scanner, then it may be poor gas making the engine knock and it's retarding the timing. Fuel pressure at idle should be 65-71 so I'm not gonna say a pound off is bad but see what it is with engine off also check vacuum at intake at idle if 15" or below suspect a clogged converter/exhaust.
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Wednesday, July 29th, 2015 AT 2:07 PM

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