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Tried to start 2004 f250 with out glowplugs now it wont start. checked fuse still wont start

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Glow plug light and glow plug are not on same system
check at gow plug conection (top of valve cover both side
follow from relay front valve vover right side silver box)
power 12 volts on all 4 wires in both conector left and right
if not replace relay if 12 volts relay ok (test light clip on ground)
then check glow plug (test light clip on positive ) touch wires going
to glow plug should light up if ok (quick test ) if any fail replaced
if all seems ok look at the oil injection system most common
problem with these motors I have yet to replaced a glow plug or relay

Posted on Mar 27, 2011

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1996 ford 250 glow plug fuse keeps blowing

There are not many parts in this system. You have Glowplugs, a timer, and a power relay.

Check the glowplugs. To check you take battery cables and place the fixed connection on the case of the glowplug, avoiding the threads. Then touch the top of the glowplug with the other cable. You can MELT them if you hold the top cable too long.

If you take at least 1 bank of glowplugs out at a time, you can compare them. They should glow equally bright. A dull glowplug is bad. If you do it one cylinder at a time, you will not be able to compare them.

If all check out okay, then it only leaves the timer or the power relay. The timer is a good candidate because it controls how long the pulse will be and that can be what is shorting out the system.

Oct 27, 2013 | 1999 Ford F250 Regular Cab

1 Answer

My 1999 f250 superduty 7.3 starts right up when cold but hard to start after it is warm and surges while driving at 55 mph. it does have a 6 speed ******.

There may be more than 1 problem. The Timer for the Glowplugs adjusts itself for the temperature of the engine and surrounding air temperature. It is suppose to keep the timer going longer for a cold engine than a warm one. But it does need to heat the Glowplugs to atomize the fuel, then compression takes over.

If the Glowplugs have not been inspected lately, it would be a good time to do it. To test, use a jumper cable with care not to damage the threads of the Glowplug. Usually clamp one end of the jumper on the base of the Glowplug and briefly touch the top where the wiring plugs in.

The Glowplug can melt, but you want to see it glow in a short period of time and uniformily with all 8. Any that stay dark are bad, subpar will take longer than you have and will not fully atomize the fuel before they lose power from the timer.

Another problem can be the gating in the Turbo. There should be clean passages for the valving to seal when the Turbo closes. If the Turbo does not close, the exhaust compression may leak into the cylinder too early before a fuel charge is atomized. Since the Glowplugs are barely on for a hot engine, it will complicate starting.

Since your engine starts great when cold, fuel line integrity and the fuel system should not be a problem. Surging at 55mph is probably due to the Turbo.

Check your Vacuum levels at a convenient tap and see if the Vacuum bleeds off quickly or holds pressure for awhile.

Please rate my info and I hope I have been helpful.

Nov 14, 2012 | 1999 Ford F250 Regular Cab

1 Answer

2004 F250 will not start, no fuel

if you checked all the fuses and all are good then put the key in ignition and turn to the on positon but dont try to start it. you will hear the fuel pump kick on. if you dont then it is a bad pump.

Nov 05, 2011 | 2004 Ford F250

1 Answer

2002 super duty 7.3 wont start wait to start light on dash doesnt come on anymore hasnt started since the light quit

Hello, Follow your Glowplug wires back to a box and that box is your Timer. You should have wires going into the Timer from either the Ignition or from a Relay between the Ignition and the Timer.

When you turn the Key to Run, there should be power going into the Timer box. If there is power going in and nothing is happening, then the Timer is bad. If there is no power going into the Timer, work your way up to the Relay.

On your truck the Relay should be a DY 861 Motorcraft. It will look a little like a starter Relay. Check the power in and out, there is a fuse in the panel for this too! But if the fuse blew it will probably do it again until a bad part is replaced.

Feb 22, 2011 | 2002 Ford F250 Super Duty SuperCab

1 Answer

1994 7.3 wont start without ether runs good after it starts turns over good after it warms up .still wont start without ether

There are two areas to check for this problem. The fuel and the spark. There is a Timer for your Glowplugs and you should hear clicking and notice the lights dimming in Synch with the clicking. This should work with your "Start" lamp in the dash.

Test one or two Glowplug wires with a Testlight and see what kind of Spark you have. If the spark is present you need to pull about half of your Glowplugs, if not all, and Test them with Battery voltage. They should be uniform in glowing and be careful not to melt them. Any Glowplug that remains cold or sluggish should be replaced. If no Spark, then check the Timer or replace it. Some models may have a Relay, check with Autozone or Oreillys or similar for parts listing.

The Glowplugs start a cold engine. In a warm engine, the Timer will not engage at a certain temperature. Engine compression will ignite the Ether if the Glowplugs do not work, but compression will not ignite a cold diesel engine.

Fuel, if you have a bleeddown in the fuel system the pump may be weak or there is a hole in the line or bad "O" rings. The Ether simply gets the engine turning fast enough to siphon the fuel and draw it back to the pump. A shop can pressure check the fuel system for leaks or use a "smoker machine" for difficult to find leaks.

I hope this helps and you are happy with the info I provided.

Aug 24, 2010 | 1994 Ford F250 Supercab

1 Answer

A relay in the dash board ic clicking and truck wont start its a 1999 f250 super duty diesel. it turns over but wont start. i just installed new fuel pump its working fine

It sounds like the "Timer" for the glowplugs, but you may want to prime the Fuelfilter to provide a draw for the fuel. One of the problems is you lost the fuel in the lines as soon as the fuelpump was disconnected.

If you installed the fuelpump because of a "NO start" condition it may have been the Glowplug timer all along. You may have taken a wire loose for the Timer or broken a wire. The Timer box needs feedback from the Glowplugs.

Disconnect one of the Glowpug wires and put in a test light to the wire. Observe when you put the engine in RUN position if the Testlight will light up. If the Testlight does not light, you are not getting power to the Glowplugs.

Diesels need Glowplugs only for starting. After that, the compression operates the engine. The Timer for the Glowplugs regulates how long the Glowplugs work each cycle. You may have to test the Glowplugs if they get power but do not work.

Each Glowplug is like a sparkplug. You would need to pull them and connect 12 Volts to each. Use a jumper cable and do not touch the threads. Use power sparingly or you can melt them. But 1 by 1 you can see a difference in a bad or good glowplug by how each gets hot.

Aug 14, 2010 | 1999 Ford F250 Regular Cab

2 Answers

Hard Starting in morning

Do mean you have hard time communicating with a scanner at the OBDII connector, if so make sure you power at pin16 at diagnostic connector, also we have seen issue with glowplugs not working properly causing hard start when cold and starts fine after warm-up
You can check for glowplugs operation at initial key-of before cranking by checking for voltage at each glowplug connector with a multimeter.

Mar 08, 2009 | 2003 Ford F250 Super Duty Crew Cab

1 Answer

2001 ford f250

Do you have access to an amp clamp to check amps going to the glow plugs. Remove the oil temp sender which is on the back of the hi psi oil pump reservior 2 wires. This will make the relay run longer. Then hook clamp over the 2 brown wires on glowplug relay should have about 175 amps if its working right. I have also seen the fuel heater inside the fuel filter housing go bad as well. Might check all the fuses as well incase the fuel heater fuse is blown.

Dec 23, 2008 | 2002 Ford F250 Super Duty SuperCab

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