f 150 shudder on take off

2002 FORD F-150
6 CYL • 2WD • AUTOMATIC
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ADAM.STUDEBAKER
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  • 5 POSTS
after driving for bout a week i finally got some codes p0171 and p0174 with p0455 pending i tested fuel regulater and pump they check out i cant figure out this shuddering problem but its gotten worse im checking the maf next but dont hold much confidence that this is the issue i also cant find any vacuum leaks
Mar 15, 2011 at 1:27 AM
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RASMATAZ
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P0171/P0174

Lean fuel condition could be caused by one of the following below:

1.Vacuum leaks
2.EGR and PCV valve.
3.Low fuel pressure.
4.Dirty fuel injectors.
5.Mass Air Flow Sensor.
6.Oxygen Sensor.


A code p0455 most likely means one or more of the following has happened:

A loose or improperly affixed gas cap
A non-conforming gas cap (i.e. not factory/original brand)
Other leak or damaged piece in EVAP system

Possible Solutions With a p0455, the most common repair is to:
Remove and reinstall the gas cap, clear the codes, and drive for a day and see if the codes come back.
Otherwise, replace the gas cap, and/or
Inspect the EVAP system for cuts/holes in tubes/hoses (you may hear a vacuum noise or smell fuel), repair if necessary
Mar 15, 2011 at 1:30 AM
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ADAM.STUDEBAKER
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feul cap was leaking, still havnt found case of p0171 n p0174. am down to checking injectors thanks for the help guys.
Mar 23, 2011 at 1:29 AM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.