Craigums Posted January 9, 2013 Share Posted January 9, 2013 2004 F-150 idles rough, and often kills during idle. It start right back up however and I have not noticed any other issues. Is there any basic things I should be checking?Thanks Quote Link to comment Share on other sites More sharing options...
Jeremy airjer W Posted January 9, 2013 Share Posted January 9, 2013 Happens when cold or hot or all the time? Check engine light on? (Silly question, its a ford its always on.... ) 5.4 liter? Quote Link to comment Share on other sites More sharing options...
Craigums Posted January 9, 2013 Author Share Posted January 9, 2013 Yes 5.4L , Check engine light is on (code spits out something about fuel pressure and to check the gas cap). I haven't really noticed it more when it's hot or cold. Idles rough about 80% of the time. Every once in a while it'll idle really nice Quote Link to comment Share on other sites More sharing options...
Jeremy airjer W Posted January 9, 2013 Share Posted January 9, 2013 I think I would check the codes again. My first thought is since its winter vacuum leaks are more common. If you see a p0171 or P0174 than I would for sure suspect a vacuum leak, plenum gaskets are fairly common. The other possibility is a dirty MAF sensor. Quote Link to comment Share on other sites More sharing options...
Craigums Posted January 9, 2013 Author Share Posted January 9, 2013 K, i'll check em again Quote Link to comment Share on other sites More sharing options...
CAMAN Posted January 9, 2013 Share Posted January 9, 2013 Do these trucks have a replaceable fuel filter? I'd check that. Quote Link to comment Share on other sites More sharing options...
Jeremy airjer W Posted January 9, 2013 Share Posted January 9, 2013 If the filter where plugged that bad it would have a noticeable performance issue. I have one filter cause a performance issue and that was 12+ years ago. Quote Link to comment Share on other sites More sharing options...
fishnowworknever Posted January 13, 2013 Share Posted January 13, 2013 Welcome to the club man. My 2005 does the same thing. Do you have a K&N filter or other aftermarket oiled filter? That'll make it happen more often. Remove the throttle body, clean it with a good TB cleaner ( no need to saturate it, and don't scratch the plate). Quote Link to comment Share on other sites More sharing options...
JOHNBIGDOG Posted January 13, 2013 Share Posted January 13, 2013 Does the 04 have a fuel pump driver module? I'm feeling a little to lazy at the moment to look it up. If it has one it is located above the spare tire, on the left/driver side of the truck. The aluminum housing breaks exposing the circutry inside and causes a similar complaint. Or a C.N.S. ( crank no start) Quote Link to comment Share on other sites More sharing options...
Scott K Posted January 13, 2013 Share Posted January 13, 2013 The new style 04 has one(non Heritage), and it isnt above the spare tire until 05. The 04 has it mounted on the LR frame rail, and it is actually more common to go bad then the later ones, that are above the spare tire. Quote Link to comment Share on other sites More sharing options...
Craigums Posted April 3, 2013 Author Share Posted April 3, 2013 My first thought is since its winter vacuum leaks are more common. If you see a p0171 or P0174 than I would for sure suspect a vacuum leak. DING DING DING!It turned out to be a vaccuum hose leak on the backside of the intake manifold Quote Link to comment Share on other sites More sharing options...
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