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Author Topic:   99 F-150 Stalling Problem

Posts: 895
From: Port Allen, La. 70767
Registered: Jun 99

posted 11-28-2005 10:10 PM     Click Here to See the Profile for RonnieT   Click Here to Email RonnieT     Edit/Delete Message   Reply w/Quote
A friend of mine at work is having a problem with his 99 F-150 with a 5.0 in it.

His problem is in the morning when it is cool the engine cranks fine and runs great. In the afternoon, after the temperature has warmed up and he is ready to go home the engine runs very rough and will not idle. He has to drive 2 footed to keep the engine from stalling until the engine has warmed up, then it runs fine. He took it to the Ford Dealership and they told him that they could not find anything wrong with it.

Anyone have an idea what may be wrong?


69 mach1 351W-4V engineless at the time!
70 Torino GT 351C-4v with a "shaker"
Mustangs and More Member #23

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Posts: 4341
From: Lusby, MD
Registered: Jun 99

posted 11-29-2005 06:09 PM     Click Here to See the Profile for GTRocks   Click Here to Email GTRocks     Edit/Delete Message   Reply w/Quote
Sounds similar to the problem I was having but reversed in temperature (see 2001 Expedition post below this one). I recommend taking apart the air intake, and cleaning the MAF sensor and the throttle body. My butterfly valve in the throttle body was pretty gummed up. I took some air intake fuel injector cleaner (Gunk) and sprayed it out and rubbed it down with a clean cloth. I took the throttle body off and cleaned both sides of the butterfly and down into the intake. I also cleaned the two wires in the MAF with a q-tip very gently to make sure they didn't have any crap on them. Put it all back together and it's been fine since.

The fact that altering the RPMs keeps it running makes you think it's a sensor mis-mixing the air/fuel ratio. That leads you to the TB, or MAF, for starters anyway.

Good luck!


M&M Member #33
'66 Coupe C code
'93 GT 'vert (AOD to T5 swapped)
'01 Saleen #648

[This message has been edited by GTRocks (edited 11-29-2005).]

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68 S-code GT

Posts: 3221
From: Sayreville, NJ, US
Registered: Mar 2000

posted 01-03-2006 10:52 AM     Click Here to See the Profile for 68 S-code GT   Click Here to Email 68 S-code GT     Edit/Delete Message   Reply w/Quote
Not to start any trouble but they never had a 5.0 in the 99 style truck. Is it a 5.4 maybe?

Ed S.

68 S-code FB GT 4spd(now C6)/3.25 PS PDB
68 J-code(now 289) Cp Sprint"B" C4/3L00-9" PDB PS AC Bla-Bla-Bla
99 F150 XLT Ext/cab, 4X4, 5.4L, 3L55

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