My 2010 f150 fx4 5.4L doesn't start right. It will crank over idle up to 2000rpm then slowly idle down to a normal rpm, if i throw it in reverse right away it will run rough then die and be really hard to fire it up. Then when it does fire white smoke comes out of the exhaust till it warma up. It Only does this in the mornings or after a long work shift. No engine light has come on.

What could it be? Any help is greatly appreciated.
Thanks

 

Cylinder missfire , it happen to mine,,no check engine light.I went to my friend shop borrowed a scan tools and It reads a bunch of codes .and a cylinder 7 missfire . I replaced the #7 coil And. It Fix the problem. and it reset the codes itself after a few miles of driving .yours might not be same problem .but . Scan tools can check it . For you.goodluck.

 

Thanks for the help. I did have this code http://www.obd-codes.com/p0172a couple months ago but had a friend clear it and it hasnt caused the engine light to come back on since. i think it probably relates to this by the looks of it or it is the same problem u had.

 

Have you had your local dealer take a look at your truck, ryan864? They're best able to diagnose this concern. If you haven't already, use this tool to locate one nearby and schedule an appointment. Please keep me posted; I'll keep my eyes peeled for any updates!

Have a great day!

Brittany

 

bump