Still MISSING
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Senior User
Joined: Mar 2008
Posts: 147
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From: Miami Lakes, Fl
Still MISSING
I have done a complete tune-up including new coils and i am still have a problem around the 30 to 40 MPR range. The engine is missing but no check engine lite. I am going nuts with this......
PLEASE HELP
98 F150 5.4 4x4 automatic
PLEASE HELP
98 F150 5.4 4x4 automatic
Thread Starter
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Senior User
Joined: Mar 2008
Posts: 147
Likes: 0
From: Miami Lakes, Fl
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Fleet Mechanic
Joined: Aug 2002
Posts: 1,344
Likes: 12
From: Sioux Falls SD
Have you had the injectors professionally cleaned?
Our shop had a 1988 F150 with the 302 that had a miss at that speed. Dealer tried plugs, wires etc, checked trans and torque converter but nothing helped until they cleaned the injectors. Had about same miles at the time too as yours.
Our shop had a 1988 F150 with the 302 that had a miss at that speed. Dealer tried plugs, wires etc, checked trans and torque converter but nothing helped until they cleaned the injectors. Had about same miles at the time too as yours.
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Elder User
Joined: Nov 2001
Posts: 892
Likes: 1
From: Duluth, MN
Put an injector in her! Get access to a scan tool, not a code reader. Do a misfire monitor to find out which cyl is missing. Then swap your injector with another one on that same bank. when the misfire moves to that new bank, you know it's the injector.
or you can save yourself the hassle and just put the injector in!!
Go OEM though, none of that aftermarket crap. Or you'll be brinin it to me at the dealership and I'm just gonna tell you to pay me to put OEM injector in it. haha!
or you can save yourself the hassle and just put the injector in!!
Go OEM though, none of that aftermarket crap. Or you'll be brinin it to me at the dealership and I'm just gonna tell you to pay me to put OEM injector in it. haha!
Fleet Mechanic
Joined: Jul 2003
Posts: 1,570
Likes: 20
I had the same problem a couple years ago, took the IAC valve out and sprayed the inside with throttle body cleaner and let it soak a half hour, resprayed, shook out. I also may have moved the valve by pressing on it with my fingers, while wet, but I can't be sure on this point. Rapping on it with a screw driver handle sometimes made the missing go away, was worse on cool mornings.
Fleet Mechanic
Joined: Jul 2003
Posts: 1,570
Likes: 20
Wouldn't Torque Converter lock-up, have other symptoms? Such as truck acting like it has a mind of its own and is going to charge thru a red light, if on level ground, light load, slowly accelerate to a certain point, then it's "Charge ahead 
" Engine speeding up and slowing down, all on its own. Would only stumble and miss after it had been at a higher speed, not from a dead stop after a restarting of the engine.
" Engine speeding up and slowing down, all on its own. Would only stumble and miss after it had been at a higher speed, not from a dead stop after a restarting of the engine.