1997 - 2003 F-150

Engines problems with my truck NEED HELP!!!!!

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Old Feb 25, 2010 | 09:55 PM
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Thumbs down Engines problems with my truck NEED HELP!!!!!

The codes it throws are as follows. P1506, P0401, P0304, and P0000 6 times.
1506=Idle Air Control Over Speed Error
0401=related to the EGR somehow, not sure the specific code
0304=continous misfire on cylinder #4
Also when I accelerate hard the OIL psi gauge drops and the light comes on but then goes back to normal.
This is a video at idle.
 
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Old Feb 25, 2010 | 11:52 PM
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From: PA
thanks for the help guys
 
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Old Feb 26, 2010 | 04:49 PM
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what is terrible is that yourcobalt.com helped me out more with my truck than this F150 did.
 
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Old Feb 26, 2010 | 05:12 PM
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From: missing Texas...
Originally Posted by camopaint0707
what is terrible is that yourcobalt.com helped me out more with my truck than this F150 did.
so your truck is fixed??
 
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Old Feb 26, 2010 | 05:16 PM
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something to do with the DPFE ?
 
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Old Mar 1, 2010 | 03:11 AM
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nope still not fixed, don't know how to
 
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Old Mar 1, 2010 | 05:59 AM
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Originally Posted by camopaint0707
P0401
Most likely clogged passages in the throttle body/upper intake. Remove the EGR and the upper intake/throttle body. Clean out the passage where the EGR connects. It flows thru and turns into 2 passages on the inside of the intake/TB. Pipe cleaner and card/TB cleaner will do the job. Reassemble(if it's not clogged then test the EGR by applying vacuum, if it stalls out.. it's working. Still have the code could be the DPFE sensor.
Originally Posted by camopaint0707
1506=Idle Air Control Over Speed Error
Vacuum leaks or IAC stuck open or a grounded short.
Originally Posted by camopaint0707
0304=continous misfire on cylinder #4
To me it sounds as if a coil is going out, but if you have any major vacuum leaks going on it could be a false positive caused by the other issues.

As for the oil psi gauge dropping, is the engine low on oil? Possibly something going wrong with the oil pump... someone else could have a better idea on that.
 
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Old Mar 1, 2010 | 06:28 AM
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From: missing Texas...
Originally Posted by camopaint0707
nope still not fixed, don't know how to


so the guys on the cobalt forum didn't help you


have a nice day
 
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Old Mar 2, 2010 | 12:08 AM
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I had that EGR code two months ago. I took the throttle body off and gave it a good cleaning, put it back together...no more code. It was easy to do...took maybe an hour and a half just taking my time.

Dunno 'bout the rest of the codes.
 
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