Question about 2005 Ford F 350 Super Duty

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2005 f-350 6.0 diesel wont star unless it's plugged in even if i warm out. Had glow plugs tested all were working. Changed the glow plug control module but still have the same problem

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I remember reading something on this in a service bulletin , check with the ford customer service center and ask if theres a recall or dealer fix for this problem. i just can't remember what it said and no longer have access .

Posted on Apr 02, 2011

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Have a load test done on the battery as the glo-plugs should get very hot very quickly. Diesel engines have to have a high rpm crank speed or they will not start and will leave unburnt fuel in the cylinders ( wet glo- plugs). Every indication is that the battery is flat or is not the right capacity for the car.

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My 2003 nissan frontier diesel turbo 3.0 litre wont start when its cold. if i pull start it it will start, the battery was changed, the diesel pump was serviced, the glow plugs where changed. If i pul


Hi Chris, From what you have explained I would suspect that you have a leakage where air is being drawn into the system. A good place to start looking is on the filter housings. Sometimes the gasket seals leak and give those symptoms. Once you have eliminated that area it would be a good idea to check the entire fuel line and even replace it. The glow plugs may be new, but what about the control circuit? Take a test light and make sure that power is actually arriving at the plugs? Lastly it may be the head and rotor, which is a part of the distributor type injector pump. Depending on the amount of sulpher in the fuel in your part of the world determines the life span of that part of the pump. As you say the pump has been serviced find out if the same unit was replaced. Good luck and best regards John

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The diagram in my haynes manual does not show some parts that are in my 2001 jetta tdi 1.9 turbo. i ran a diognostic and it says glow plug curcuit a malfunction, i changed the plugs and tested the coolant...


In addition to the 4 primary glow plugs, the cooling system also has 3 Coolant Glow Plugs to help provide extra heat to the cooling system in order to warm-up the vehicle's interior more quickly, and enhance overall engine warm-up time. (Example - Some Mercedes diesel engines use electrical heaters in the cabin because their engine is so thermally efficient.)
Likewise, this auxiliary source of heat from the 3 Coolant Glow Plugs is necessary because of the VW 1.9 TDI engines outstanding efficiency, which wastes very little heat.


The 3 Auxiliary Coolant Glow Plugs are located at the end of the aluminum cylinder head (in a protruding flange) directly below the vacuum (brake booster) pump, which also connects to a coolant hose.

tdisline_301.jpg
The 3 Auxiliary Coolant Glow Plugs use two (underhood) relays which are monitored and controlled by the ECU. During a cold start, the vehicle's interior temperature selector switch helps the ECU choose one of three modes depending on the amount of heat required to warm-up the coolant.

For example, Coolant Glow Plug #1 can be selected to operate all by itself, or #2 and #3 can operate together as a two-some, or lastly, all three glow plugs can form a triple source of heat for maximum enhancement of engine warm-up time.

After the engine is completely warmed up and the thermostat is open, the Coolant Glow Plugs normally shut-off and remain off unless the (thermally efficent) engine cools down sufficiently to have the computer signal them to come back on to keep the engine and cabin air warm. Extensive idling times at stop lights or in the driveway are scenarios where these glow plugs are most likely to recycle on and off.

In conclusion, the period of Preglow and Afterglow is determined by the engine's coolant temperature (during a cold or hot start), which helps the ECU select a predetermined time-cycle for the combustion chamber and / or Auxiliary Coolant Glow Plugs to follow.

Finally, one myth that needs to be immediately debunked, is the belief that the TDI's advanced Glow Plug System is linked to the opening of the driver's side door, which is false! It is also noteworthy to mention that some earlier VW diesel glow plug systems were operated in this manner, but not so with the advanced VW Jetta 1.9 TDI engine.

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Are you waiting after turning ignition key on before actually moving key to start position? My diesel I turn key to 1st position;bells and lights;if engine is cold an amber light that looks like a lamp filiment comes on...wait until that light goes out before engaging the starter.

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Typically, the glow plug light not coming on indicates that you have some bad plugs or poor connection. You need to replace the plugs and check the wire connections. It is interesting how picky diesels are when they aren't warm.
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HAd the same problem turned out to be the fuel tank selector vlv not sealing off m/t tank on return line so when truck sat cold fuel would drain off injectors making me reprime injectors (airbound)
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DEPENDING HOW COLD OUT IT IS DIESELS DONT LIKE TO START IN COLD WHEATHER UNLESS THE GLOW PLUGS ARE WARM THIS IS THE REASON FOR PLUGGING DIESELS IN MOST WONT START IF ITS COLD OUT IF ITS NOT THAT COLD OUT IT SHOULD START IF YOU HAVE ENOUGH BATTERY POWER MAYBE THERES NOT ENOUGH FUEL GETTING UP TO THE THROTTLE BODY HOPE THIS HELPS

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