Question about 2005 Ford F 350 Super Duty

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I have a 2006 super duty f250 diesal.It cranks,but will not start.What do I need to do? I replaced both batteries with new ones.

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Get a voltmeter or Test light and take off one of the Glowplug wires. The Glowplug is similar to a sparkplug and is not connected to the Fuel rail. You want to see if the Glowplug wire is getting power. The wire should have at least intermittent power, full power for a initial Cold start. This power lasts under 2 minutes.

Diesels need a Hot Glowplug to start the engine. All of the Glowplugs are connected to a timer box. The timer box is also Temperature controlled to stay on longer in the coldest weather. You should hear a "clinking" noise and the lights should dim in sync with the clicks.

If you are not getting spark to the Glowplugs check the connections to the timer box. If you are getting spark to the Glowplugs you may need to check them. Pull a few out and use jumper cables to briefly energize them. Watch out not to damage the threads. As you test do not overdo it. You can melt them!!

Finally, the fuel. Take off the fuel filter and observe if the fuel filter is empty or full. If empty you have a bleedoff problem in the fuel lines or a bad fuelpump.
Replace the filter with a new one and prime the filter with fuel. If the engine starts and then dies, you must find the bleedoff hole in the fuel line or check the output of the fuelpump with a gauge.

Diesels are harder to work on. I have read about crankshaft sensors causing problems. But for the most part, diesels are still primitive and the basictests have to be done by hand.

Posted on Jun 05, 2010

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