6.0 hesitant to crank but turns over eventually - Ford Powerstroke Diesel Forum
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Old 10-24-2013, 04:05 AM
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6.0 hesitant to crank but turns over eventually

So I believe this is the 3rd time I have experienced this problem and I'm lost at what it could be. This morning when I went to crank my truck, when I turn the key, it acts just as if the batteries are dead. Lights dim but truck doesn't even attempt to turn over. Finally, on the 3rd key turn, the truck cranked and started up. Just had my batteries and starter checked, the were fine. My volts this morning were reading around 11.5v, Injector control pressure normal as well. The only thing different that I noticed is that once the truck cranked, my FICM voltage was only 41v (didn't notice what it was before crank). Usually when I start the truck, its around 45v and once the truck is warmed up it stays around 47v-49v. Truck runs fine and operates normal, nothing unusual. Anyone have any ideas?? I'm completely lost!
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Old 11-03-2013, 02:23 AM
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I'd load test the batteries (separately) with the Low Voltage reading from your FICM upon startup it would appear that you have one or both not holding an adequate charge. The FICM voltage should NEVER drop below 45.00volts even after startup. And low voltage will also cause the starter to not respond when the key is turned. I know that doesn't explain fully as to why it does respond after multiple tries other than the batteries are border line? If you DO find the batteries to be low a good way to double check is to put them on a charger and try to bring them up to a full charge and then see if your starter responds the first time you attempt to engage it. It is also important to note that if you DO find just one of the batteries to be bad you replace both at the same time....Hope this helps.......Also would be a good idea to check the alternator for output, when the vehicle is running it should be pushing 14.00volts plus.

Last edited by Mcrafty1; 11-03-2013 at 02:26 AM. Reason: Additional info
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Old 11-03-2013, 04:38 AM
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One other thing to check is the cable conditions themselves. Corrrosion can keep the voltage from getting from your batteries to the starter.

For example if your batts have 12v,at 800 amps, corrosion can rob several volts/amps before it gets to the starter. Leaveing you with only 11v at 600 amps. This is barely enough for the starter to engage the bendix and roll over the engine.

The repeated application of voltage can sometimes heat the wires and help overcome the corrosion and the truck will start.
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Old 11-03-2013, 05:08 AM
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Sounds like a hydro locked cylinder and failing FICM.
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Old 11-03-2013, 02:09 PM
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Quote:
Originally Posted by Tuscany View Post
Sounds like a hydro locked cylinder and failing FICM.
Would it turn over with a hydro locked cylinder? without clearing it first that is?
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Old 11-03-2013, 02:21 PM
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Eventually.
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