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2005 rough Idle and loss of power

Old 01-29-2014
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Default 2005 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:
Cats
Fuel pump
Plugs (motorcraft)
Random Coils
Did the timing chains and phasers
MAF
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.

Last edited by Spudy; 01-29-2014 at 09:36 PM.
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Old 01-30-2014
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Just might be the solenoid. Also, check all the vacuum tubes and EGR tube. The easiest way is with a can of carb and choke cleaner. With the engine running, start spraying the cleaner around. When the engine revs when you spray an area, there's a leak. Repair it and try another area.
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Old 02-02-2014
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Originally Posted by Spudy View Post
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:
Cats
Fuel pump
Plugs (motorcraft)
Random Coils
Did the timing chains and phasers
MAF
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.
vct solenoid is stuck
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Old 02-18-2014
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Originally Posted by makuloco2000 View Post
vct solenoid is stuck
Replaced both vct solenoids still having same problem. Can find any vacuum leaks. Could I have gotten a bad cam phaser?
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Old 02-18-2014
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Originally Posted by Spudy View Post
Replaced both vct solenoids still having same problem. Can find any vacuum leaks. Could I have gotten a bad cam phaser?
No new codes? What does the vct error pid say?
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Old 02-18-2014
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Originally Posted by makuloco2000 View Post
No new codes? What does the vct error pid say?
No codes anymore.
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Old 02-18-2014
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Disconnect the battery and leave it disconnected for 20 to 30 minutes. Reconnect the battery and see if the problem is still present.
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Old 02-18-2014
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will give a try in the morning. Thanks
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Old 02-19-2014
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Not any better :-(
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Old 03-17-2014
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FYI, I'm having a similar issue. ANy thoughts?
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