F 150 shudder on take off

ADAM.STUDEBAKER

MEMBER
2002 FORD F-150
6 CYL
2WD
AUTOMATIC

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

2 Replies

RASMATAZ

MECHANIC
75,992 POSTS

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