Just bought a 1991 ford f250 4x4 manual trans and a 5.0L motor, it runs fine cold but once it is warmed up it dies at stop signs or sitting still , i did notice that cold it blows alot of smoke out the back like its runing rich. i dont know alot about efi or all the sensors so could some one out there point me in the right direction on what to look for first. thanks
How long since a tune-up? Any applicable trouble codes? If temp related check the coolant temp sensor. Sometimes ford calls it a cylinder head temp sensor. I'd also use a gage and check proper fuel pressure.
SOURCE: Heater motor
Test the circuit cold. (when the motor is not working) If power and grounds are good, replace the motor. When you have the blower motor out,check for any debri that has accumulated in the case.
SOURCE: 91 explorer heater not blowing air
The blower motor is located under the hood on the passengers side next to the hood hinge on the firewall. But, check your blower motor resistor first. The resistor is usually the trouble maker. It is located next to the blower motor. It should have 2 screws holding it onto the heater housing. Also an electrical connector. I sincerely hope that this will get it working again. Best wishes to ya.
Bryon
SOURCE: ford f250 diesiel sputters blows black smoke dies
youll think im crazy but change the oil and look for a oil leak, prob around the fuel filter
SOURCE: we think it is the diesel injection pump but not sure
Sounds like not all the glow plugs are working.It should run fairly smooth on a cold start if all of the glow plugs are working..Also you shouldn't drive off on a cold start with a diesel,Its really hard on the motors..At least give them 10 to 15 min on a cold start..The oil in them is a really thick oil and when there drove on a cold start theres no oil lubricating the internal parts and will cause the motor to seize up..You may already no this and dont mean you drive it as soon as you start it i just wanted to let you know..When you get alot of white smoke it could be two things,Theres water in the fuel which will make it not have much power die and smoke..But if it runs fine when its warm theres some bad glow plugs...Hope this helps you and have a great day
I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589
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