I have a 1992 f250 idi n/a

So when I first bought my truck a couple years ago my ex was helping me fix a lot of things but he never liked to tell me what he was doing.

one of the problems I had was when you came to a complete stop, usually only if it was a pretty quick stop, the truck would like stall. So he turned the screw on the IP and the problem went away. Now my truck idles at like 900 rpms but I’ve heard these things are supposed to idle at about 500-600?

My question is had anyone had this stall issue and was that the right way to fix it or was this just a bandaid?

ive also been getting ****ty mpg and I’ve foxed all my fuel leaks so I’m wondering if this turned screw could be part of that?

I haven’t quite had the issue your describing but you might be able to adjust the idle screw on the throttle back down. Also, make sure you throttle cables are letting the throttle go to idle and make sure the spring on the throttle control on the IP is on there and pulling it back to idle position when at idle. Also make sure the plunger on the fast idle solonoid is not holding the throttle open more. It should only do this when cold.

Turn the screw counter clockwise to slow engine down a little and give it a try. Back it off one turn and see how fast it idles. I think idle speed is around 650-700rpm.


Also, does your truck roll smoke while driving? Are you sure he turned the fuel up or could he have just turned the idle screw up? If he actually turned the pump up, it may be pouring in more fuel then needed especially if it does not have a turbo.
A small turn of the pumps fuel adjustment screw goes a long ways. Usually we only go a flat or 2 on an Allen wrench which is only about 60-120 degrees turn.

Here is a picture of the idle speed adjustment screw.




here is a picture of the fast idle solonoid Attached to the pump. The only time the fast idle should be pushing on the throttle is when the engine is cold.

actually YES! I did end up finding the pick up foot on my front tank decentegrated but I fixed that so maybe that was my issue all a long?

Well the idle screw def did get turned up because you can see a mark from where it used to be but since someone else suggested about the fuel tank thing I’m def going to try turning it back down a bit since I fixed that issue.

as for the fuel screw I’d have too look but I’m sure if he touched that but it does smoke a bit, but you can only really se it at night coming off a stop light when there’s car lights right behind me.

interesting? I was told that they couldn’t really black smoke without the turbo. This is only like a grayish smoke, nothing major.

and mines a 1992 single cab long bed, with factory sized tires, auto e4od, not sure what gears, 2 wheel drive and I get 16 mpg highway so far, usually around 14/15 in town. And when I say highway that’s cruise control 60/65. I’ve just read a few people are getting close to 20. And I’m just wondering if a worn out IP could make a difference?