F-250

AARON BELL

MEMBER
2004 FORD F-250
V8
4WD
AUTOMATIC

I have a 2004 f250 6.0 at 1800 to 1900 rpm while under a slight load (going up a hill empty) it loses power stutters, belches black smoke and loses power. This is at about 60 -65 MPH. If you let up on the throttle or increase the throttle it levels out and runs ok

Wednesday, February 16th, 2011 AT 10:49 PM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

The black smoke indicates a rich fuel mixture. Have you checked fuel pump pressure and the regulator? Also, check for vacuum leaks. An O2 sensor may be over compensating for a lean mixture.

If the check engine light has come on, have the computer scanned to identify trouble codes. Let me know what they are.

Joe

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Thursday, February 17th, 2011 AT 7:31 PM

AARON BELL

MEMBER
2 POSTS

There are only codes that go back to the EGR. With what you are saying would it only happen at 1800-1900 RPM at 60-65 under a small load (pulling a hill empty). If it is a fuel pump problem wouldn't it be all the time?

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Thursday, February 17th, 2011 AT 8:40 PM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Have you removed and checked the EGR and the intake for carbon build up? As far as the fuel pump, under a load, if there isn't enough fuel pressure, it may start running lean and the O2 sensors will tell the computer to richen the mixture. I know it sounds odd, but it happens. There are so many computers and sensors on vehicles today, one thing can set off a chain reaction of events.

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Friday, February 18th, 2011 AT 2:19 AM