Question about 1989 Ford F 250

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Glow plugs not working in my F250 diesel...any suggestions?

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  • Mike Butler
    Mike Butler May 11, 2010

    Have you located relay for them yet? Good place to start.

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  • Ford Master
  • 14,036 Answers

Glow plug controller or relay problems

Posted on May 18, 2009

6 Suggested Answers

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Posted on Jan 02, 2017

juggernautxt
  • 145 Answers

SOURCE: 04 f250 diesel cranks but won't start

this is an oil pressure problem, either a sensor is not sensing enough oil pressure, or the high pressure pump is not building enough pressure(possibly leaking or head is leaking). this engine requires 450 psi minimum oil pressure at the injectors to actuate the injectors.

Posted on Apr 30, 2009

Molson02536
  • 3854 Answers

SOURCE: 1993 ford f250 7.3 diesel glow plugs not working.

Check the fuse first then check the wire harness and connection working your way back from the glow plug to the fuse box. Good luck and hope this helps. If everything is good then replace the glow plugs. 

Posted on Jul 03, 2009

  • 176 Answers

SOURCE: 2000 Ford F250 truck w/7.3 Diesel is hard starting

Diesels are famous for hard start when cold. Consider having a diesel shop install an engine heater.

Posted on Oct 26, 2009

  • 171 Answers

SOURCE: 1992 F250 7.3 idi diesel glow plug relay has power

Have you checked the glow-plugs? On that system if one glow-plug is burnt up than it will not let the main relay in the controller to kick in.
Check all the glow-plugs make sure they are working.
The easiest way to check them is with a regular 12v test light.
Hook up the negitive end (aligator clip end ) to the battery + terminal and than with the other end of the test light ( pointed end ) touch each glow- plug connector tip ( with the glow-plugs harness connector removed ) and see if the test light lights up.
If the test light up--- glow-plug is good. If not than the glow-plug is bad--burnt out .

Posted on Feb 13, 2010

Testimonial: "Thanks, I had one out and now the truck starts right up. "

  • 701 Answers

SOURCE: f250 Diesel will not start cold . Has power to

Hello philkatkiele: My name is Roger and I will help you. First thing you need to check is the glow plugs. They will need tested individually. Un plug all 8 glow plugs. Take a test light and hook end to the positive battery cable. Touch opposite end of test light to the terminal end of the glow plug. The test light should light. Touch all 8 glow plugs. Ant that do not light are bad and will need replaced. If glow plugs are burnt out then the controller will flash wait light to early or very fast. The wait light should be on for approximately 10 seconds.If al glow plugs check ok then I would suspect the glow plug controller as the problem. Also if the temperature out side is below 40 degrees the truck should be plugged in. This will help to make the engine start easier. Should you need further help please just ask.Please rate the answer as this way I know it was helpful. Thank You for using Fix Ya. Roger

Posted on Feb 15, 2010

Testimonial: "Thank you, Glow plugs are new. It helps to have a second oppinion"

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1 Answer

Why is my ford diesel hard to start


Hard starts, can be a number of different things... But most common is some or most of your glow plugs are bad, or your glow plug relay.
if you have not changed to glow plugs, in a few years, you should just replace them. They're not that expensive.
when glow plugs, and the relay are working properly, vehicle starts right up.

May 27, 2014 | 1994 Ford F250 Supercab

1 Answer

1992 F250 7.3 idi diesel glow plug relay has power to two large posts and one small post and the second small post pulses when activated. I checked ground to engine and seems to be gounded fine. Any ideas...


Have you checked the glow-plugs? On that system if one glow-plug is burnt up than it will not let the main relay in the controller to kick in.
Check all the glow-plugs make sure they are working.
The easiest way to check them is with a regular 12v test light.
Hook up the negitive end (aligator clip end ) to the battery + terminal and than with the other end of the test light ( pointed end ) touch each glow- plug connector tip ( with the glow-plugs harness connector removed ) and see if the test light lights up.
If the test light up--- glow-plug is good. If not than the glow-plug is bad--burnt out .

Feb 13, 2010 | 1992 Ford F250

1 Answer

F250 Diesel engine won't start in cold weather


check your glow plug relay! located on the right side head

Dec 27, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

1993 ford f250 7.3 diesel glow plugs not working. what to do?


Check the fuse first then check the wire harness and connection working your way back from the glow plug to the fuse box. Good luck and hope this helps. If everything is good then replace the glow plugs. 

Jul 03, 2009 | 1993 Ford F250

2 Answers

My F250 will not start when it is cold out


Gasoline engines work with a spark plug, where an electrode ignites the fuel mixture. Diesel engines operate on the principle of heat and pressure. Compression ratios are very high in diesel engines and when the air is compressed into a very confined space it heats rapidly, then the fuel is injected and combusts. Most diesel engines have a "wait to start" light when you first turn the ignition to on. If the temp is below normal, I might would allow for a few extra seconds for the glow plugs to heat up. The block heater will help though, b/c it raises the temp on the engine and allows for it to build the heat neccesary for combustion.

Apr 16, 2009 | 1994 Ford F250 Supercab

1 Answer

I have a 1994 f250 with a hypermax turbo upgrade and inter cooler i would like to know if there are any ways that i can get any more power out of the truck and also if you may have any ideas why the wait...


Hello,
Your 94' F250 must have a 7.3 I'm sure. Is your engine a factory 7.3 powerstoke or a normally asperated diesel? The solenoid pack for the glow plugs has been a real common culprit for these Ford diesels. The following is most likely your problem.
1-bad ground or poor ground at the glow plug solenoid.
2-Defective solenoid for the glow plug circuit.
3-Defective glow plug in the circuit.

Ok to check these problems you can do the following.
Check the ground by taking a DVOM and checking the resistance between the engine or chassis ground and the mounting bolts that secure the solenoid to the engine.
Then check for a min of 11.8 volts to the solenoid input post. Then check the output voltage to I believe the brown ouput wire to the glow plugs. Check the connection furthest from the sloenoid typicly at cyl. 1 and cyl 5. This takes two pepole. Have someone else cycle the key while you check the voltage. If the voltage is good but still the solenoid is cycling off too quickly disconnect the brown output wire to the glow plugs and cycle the key again. If the problem goes away test each glow plug's resistance for a direct short to ground or the wire arness. If the problem persists I suggest replacing the solenoid.

Jan 26, 2009 | 1997 Ford F250 SuperCab

3 Answers

1993 f250 diesel engine won't start


it could if it was diesel, but if it is gas engine check the coil

Aug 04, 2008 | 1993 Ford F250

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