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Old 10-03-2013, 05:24 AM
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crank, but no start HELP!

Truck turned over but wouldn't start or fire at all this morning. Last Friday my alternator went out and I drove on just battery power for 30 minutes. Truck ran fine all week until today, now nothing. I assume its a fuel problem, I heard low voltage can damge the FICM. Might this be the problem? Or is there something I should check before that? Please help asap, this is my only vehicle, and I'm hitching a ride to work as of now. Thanks everybody!
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Old 10-03-2013, 07:21 AM
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And yes, I just realized there is a "click here if no start" thread at the top of this forum.
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Old 10-03-2013, 01:15 PM
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Yes low voltage can kill ficm. Test the ficm voltage koeo and cranking. Test everything else in the sticky and report back with all your numbers


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Old 10-03-2013, 04:17 PM
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With battery on, putting 47.5 volts. With engine cranking putting out between 47.5 and 48.5 volts... Checked my fuses, no CEL's...
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Old 10-03-2013, 04:22 PM
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Any codes?


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Old 10-03-2013, 05:22 PM
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Nope, no codes.
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Old 10-04-2013, 04:46 AM
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Any drivability issues before this? Check out ur icp and ipr values. Make sure you have pcm and ficm sync. Make sure you have 4.9v reference voltage. Try unplugging sendors on vref circuit one at a time


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Old 10-04-2013, 10:15 AM
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No issues before this really. Replaced the alternator last Friday. Tuesday morning it turned over for 5 seconds before starting, usually starts in 2 or less. Was fine after that though, until now. I will test for sync and voltage and report back
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Old 10-07-2013, 08:17 AM
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When mine did that It was

My High pressure oil pump went truck would run on a rag soaked in wd 40 help over air cleaner but wouldn't start without
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Old 10-07-2013, 03:57 PM
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Since your alternator went out and you drove on batt for a while, I am guessing that you killed your batteries. Take them off and have them tested and charged. They can have enough amperage with the two of them to crank normally but not enough voltage to power the computer to fire the injectors. Give it a shot, it's cheap if it fixes it and it can't hurt anything.
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