7.3 just shut off - Ford Powerstroke Diesel Forum
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Old 10-25-2013, 03:16 AM
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7.3 just shut off

1999 7.3 diesel just shut off while driving to work still had lights and was able to crank the engine but would not start. Having it towed. Newbe to site
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Old 10-25-2013, 05:15 AM
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get yourself a new CPS..(cam positioner sensor) from the dealership. The ones' from the autostore are junk.
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Old 10-25-2013, 05:59 AM
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Well, of course, there are literally Dozens of things it could be....

In a '99 the quick CPS test is to watch the Tach while cranking on the Starter. If it moves up slightly, the CPS is doing it's job. You can check for things like Fuel Delivery (are you below 1/4 tank?), and blown fuses (do you get a WTS light when you first roll-on the key?) before you pay for a tow. Then, you would want to get it on the right scanner to monitor the sensors to see what might be going wrong (you need a professional scanner NOT one of the cheap ones the Auto Parts Stores use).
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Old 10-27-2013, 03:03 AM
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NoRalphs Gallery Hall and Tommyboy76. Thanks for your replies not sure what the problem is yet but had to tow it to the Ford dealer ship will find out Monday as they where to busy to get it till then.
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Old 10-27-2013, 07:44 PM
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I doubt its the CPS. CPS failures are usually one miss that kills the engine and you can immediately restart it.

Sounds more like an oil/fuel delivery issue. Check fuel pressure, ICP, and IPR duty cycle. Early bet is IPR.
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