Question about 2004 Ford F250

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2004 Ford F250,6.0 Deisel .When starting cold,won't turn above1500 RPM,without choking out black smoke,hacks and coughs till back to idle then idles fine ,not drivable till idles for half an hour,will not go on high idle

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  • kennethroger Jan 03, 2010

    What an idiot ,I ask for a little help and I get the name that garge tour. I know where the Ford Garage is.Don't have the money to go there.If you have some help for me please help,if not,please don't use this forum for your free advertising. KEN

  • kennethroger Jan 08, 2010

    Problem cured,internal turbo parts carboned up,took turbo off and cleaned parts,works fine,Ken

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Ford 2004 6.0, Driving down road seams like when it starts warming up it starts Missing or accelerating,jerking,as long as you keep the acceleration it seems to work as soon as you level it out it starts missing,even dies at stoping sometimes...Changed fuel filter, put fuel additive in tank still missing,HELP

Posted on May 02, 2010

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In cold weather, my car is slow to start and has stalled a few times. What should I check?


You don't say what make of car but it's about the same for all. Your problem is the choke adjustment. The choke raises the idle when the car is cold and after warm up drops to normal. You are doing the chokes job when you hold the pedal down, once its warmed up the choke no longer functions till cold again. So check the choke and the high idle speed adjustment. Simple fix. Hope this helps mike

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Its cold start issues:----

Go through the list of help links mentioned below:----


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Idles fast problem


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Nov 18, 2017 | 1983 Chevrolet Silverado

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I have an 83 f-150 351w, in cold temps the truck won't idle till it warms up, then when it does it idles really fast, it also revs high, what can the problem be, also wen going at highway speeds after...


It sounds like it is working backwards. Around the time your truck was made the industry had different emissions standards for trucks and cars. There were less controls on trucks.

There were vacuum controls that would increase idle speed when the engine was cold. The way this was done is through a water temperature sensor that is commonly called a vacuum tree. It is called a tree because it is shaped like a tree trunk with a few branches and each branch has a vacuum hose. As water temperature increases the vacuum routing changes. The cold setting makes an idle step-up dash-pot raise RPM and close the choke plate. As the water warms, the internal parts of the vacuum tree move and change the vacuum ports.

When the ports change, RPM drops and the choke plate opens and low idle speeds are restored. With the choke plate open high speed operation of the motor is assured without bogging down.

I would say most of what can be wrong is cheap to fix. A new thermostat, perhaps a new vacuum tree. Your problem can also be the vacuum lines are not connected to the correct ports. One thing many people do is to adjust the idle speed at the wrong time. The step-up cams are not in the proper position and when stuff starts working everything is out of adjustment because the changes were made at the wrong time.

This is a job for an old school mechanic.

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2004 Dodge Durango. when started it idles high to 2000 RPMS then when on the road it stays at an rpm, you dont have to push the pedal it just goes by itself.


It sounds like the Idle Air Control Valve is stuck. This will give you a fixed idle it can stick at high idle or low or anywhere in between. If you take off the air cleaner you see where the air is getting sucked into a small slot or hole. spray some carb and choke cleaner in there let it sit for about 5 minutes then start the engine. spray a little at a time with the engine running till the idle comes down by itself. This should take about 2-3 minutes. If it wont come back on its own take the 2 torx screws out and remove it clean with carb and choke cleaner and replace. If it still fails it will need to be replaced. MOST of the time cleaning it will work

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I have this problem for quite a bit. The idling speed when engine started cold is between 700-800 rpm. As the engine gets hotted idling rpm increase to almost 1000rpm. If idling is adjusted back, the rpm...


There appears to be a thermal movement of choke mechanism that comes about once vehicle is warmed up. Check the chock connections, hot water pipe and linkages tight or clear.
gazakat

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1 Answer

Hello I have a 1980 Ford Bronco 351 2bbl. Wondering if anyone knows which screws adjust what? Please if anyone has any ideas please respond. Thank you.


Here are some images that might help to assist you, and let me know if you require any further assistance.


Adjust the curb idle with the engine warmed up and the choke off.

421d8f7.jpg


The air/fuel mixture screws should be adjusted with the engine warmed up and at normal idle speed, then turn each air/fuel mixture screw in one at a time until the engine just begins to mis-fire, then back the air/fuel mixture screw out 1-1/2 to 2 turns out a half a turn at a time until the engine idle is the smoothest. (your vehicle might have restrictor caps over the air/fuel mixture screws to limit the amount of adjustment)

ae2024e.jpg

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The choke adjustments;

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To adjust the vacuum tension pull on the choke pull-off:

71de89e.jpg



Adjust the fast idle screw to the proper RPM with the engine cold and the choke on.

cadcd19.jpg

Jul 31, 2010 | 1981 Ford Bronco

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