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2004 - 2008 F150 2004, 2005, 2006, 2007 and 2008 Ford F150's with 5.4 V8, 4.6 V8 or 4.2 V6 engine
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Old 01-29-2014, 10:03 PM
Spudy Spudy is offline
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Join Date: May 2013
Posts: 10
Spudy is starting off with a positive reputation.
2005 f150 rough idle and loss of power

Hello all
Joined the forum with hopes of getting my f150 running right so i can enjoy it like everyone else does. I have a 2005 Ford f150 with a 5.4 auto.

It has a rough idle(shakes the truck), very little power, and poor gas mileage. Randomly It will throw a code for misfire on 1 and/or 3 on start up only. It does seem to perform better within the first few of starting but dies right off after that. In fact i got stuck in the snow the other day and it could barely break the tires loose to try and get it out (almost put in 4low cause i didn't want to hurt the trans)

I have replaced:
Fuel pump
Plugs (motorcraft)
Random Coils
Did the timing chains and phasers
All new injectors
Intake gasket

Was at my mechanics and had a scanner on it and at idle the 1-4 cylinders are all show a negative cylinder contribution. But when you rev it up they all go to 0 across the board.

Was kind of thinking about the Variable Timing solenoid.

Any advice would be greatly appreciated.
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Old 02-10-2014, 01:27 AM
twfish twfish is offline
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Join Date: Jun 2011
Posts: 304
twfish is gaining momentum as a positive member of FTE.
Sounds like your throttle body needs rebuilt
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Old 02-10-2014, 01:27 AM

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