1992 Ford F250 truck wont start

Ok first off you won't get codes unless the check engine light is on this computer system don't store faults otherwise. Now I do need to know what engine you have I assume a gas engine so I would like you pull a spark plug wire and either put an old spark plug in the end or a screwdriver and place it near metal like the valve cover and crank it over do you have spark? I would also like to know if there is anything else you replaced besides the fuel filter. Have you checked the cap and rotor? Do you have a mass air flow meter on this truck (not all pickups do)? Get back to me and we will see what we can do.

my engine is a 7.5 gas . I have not checked the cap and rotor, dont know what to look for if they are bad. I cleaned out the air idle control valve. The truck used to have a Jet computer chip. I removed the chip just to see if the truck would start better, it didnt make a difference. I will do the spark plug test tonight. The only thing i have replaced on the truck is a starter and battery, other than the fuel filter. I had a tuneup put on the truck in about the year 2002 which included the cap rotor plugs and I think the plug wires but I am not sure. Sincerely Jim Timboe

Ok with the info given I would say you are over due for a basic tune up but before just buying parts do the spark test first and let me know what you find. As for checking the cap, rotor and plugs if you can remove the cap and get a good pic and do the same with couple of plugs and include the pics and I will let you know what I think.

i'll get you the pictures and test for spark. Thanks for your help so far.

No problems that is what I am here for.

I got spark, I tested the #4 cylinder wire. Here are the pictures I took. I was not sure if I should take a picture of the inside or outside of the dist. cap so I took a pic of the inside.

maybe this is a better pic of the spark plug. The plug looked crappy to me

I don't think it will be a total fix but the center button on the cap looks over worked along with the rotor and the plugs look like it is running a bit rich. So I would replace the cap, rotor, spark plugs and the O2 sensor. Let me know how it runs after that.

which oxygen sensor should i replace

Ok there is only one O2 sensor and it is in the exhaust pipe on the passanger side in the cross over pipe that is between the Y pipe just before the cat. It looks like a spark plug with a wire or wires coming out of the top. If you need a pic let me know.