Doug

I have a 99 F250 with the 5.4 w/Automatic...

Sometimes, when I start it when the engine is cold, it'll fire up, idle
just for a second or two and then want to die. If I stay on the gas as soon
as it starts, I can keep it running. All of a sudden, as I'm keeping it
running, it seems like something kicks in and the idles way up like it
should when running normal. I can then let off the gas and it will idle
fine. I usually have to keep on the gas until it reaches normal operating
temp and sometimes a bit longer. No engine lights come on or anything, it
just does that. It wont' do it all the time, just sometimes.

It "seems" that when its really humid outside, like right after a rain, or
in this miserable heat and humidity right now, it does it more often.
Almost never when its dry outside, it "seems" anyway. It's done this since
it was new, and I've had it to the dealership about this trouble, but they
have no idea, since its warmed up when I get there and even if it sat
overnight, there's no guarantee it would do it the next morning either.

Any ideas guys and gals?

TIA,

Doug

Spdloader

Is there an idle air control (IAC) motor on that model? If so, it'll do it
when it gets dirty. It can be cleaned with throttle body cleaner. (Use
sensor safe cleaner or you may get a check engine light)

Spdloader


"Doug" <DZappyNOSPAM@hotmail.com> wrote in message
news:r0tKe.4021$0d.784@trnddc06...
>I have a 99 F250 with the 5.4 w/Automatic...
>
> Sometimes, when I start it when the engine is cold, it'll fire up, idle
> just for a second or two and then want to die. If I stay on the gas as
> soon as it starts, I can keep it running. All of a sudden, as I'm keeping
> it running, it seems like something kicks in and the idles way up like it
> should when running normal. I can then let off the gas and it will idle
> fine. I usually have to keep on the gas until it reaches normal operating
> temp and sometimes a bit longer. No engine lights come on or anything, it
> just does that. It wont' do it all the time, just sometimes.
>
> It "seems" that when its really humid outside, like right after a rain, or
> in this miserable heat and humidity right now, it does it more often.
> Almost never when its dry outside, it "seems" anyway. It's done this
> since it was new, and I've had it to the dealership about this trouble,
> but they have no idea, since its warmed up when I get there and even if it
> sat overnight, there's no guarantee it would do it the next morning
> either.
>
> Any ideas guys and gals?
>
> TIA,
>
> Doug
>

Doug

Well, I"ll do some research and see if that could possibly be it. How
expensive of a part would that be, any idea? Maybe I"ll have the dealership
swap that next time I"m in for an oil change... It's a place to start!

Thanx for the reply!

Doug


"Spdloader" <askforit@nospam.triad.rr.com> wrote in message
news:jltKe.115604$Kp2.9362302@twister.southeast.rr.com...
> Is there an idle air control (IAC) motor on that model? If so, it'll do it
> when it gets dirty. It can be cleaned with throttle body cleaner. (Use
> sensor safe cleaner or you may get a check engine light)
>
> Spdloader
>
>

Spdloader

The IAC is something you can clean, and it'll work as good as new. It's not
something that is normally replaced, because they don't really wear out,
just accumulate carbon deposits on the seating surface of the valve. Take it
off, clean it up, and they usually straighten up nicely.

Spdloader




"Doug" <DZappyNOSPAM@hotmail.com> wrote in message
news:5UIKe.6488$0d.2905@trnddc03...
> Well, I"ll do some research and see if that could possibly be it. How
> expensive of a part would that be, any idea? Maybe I"ll have the
> dealership swap that next time I"m in for an oil change... It's a place
> to start!
>
> Thanx for the reply!
>
> Doug
>
>
> "Spdloader" <askforit@nospam.triad.rr.com> wrote in message
> news:jltKe.115604$Kp2.9362302@twister.southeast.rr.com...
>> Is there an idle air control (IAC) motor on that model? If so, it'll do
>> it when it gets dirty. It can be cleaned with throttle body cleaner. (Use
>> sensor safe cleaner or you may get a check engine light)
>>
>> Spdloader
>>
>>
>