duct tape & zip ties
Join Date: Jul 2006
Location: Willis, MI
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Have you checked the oil level, low oil level will cause this. Vital Idle I know on my 02 the tach don't move until it starts up. What is the voltage in the batteries. I believe you need 10.5 volts in order for the PCM to work. If you have low battery voltage the truck will crank but will not fire. If you are not pulling any codes you may need to do the old school trouble shooting. Grab a volt meter and start checking voltage at the batteries, the starter, check the voltage at the batteries while cranking, check the voltage at the glow plug relay as well. My brother had an 02 and when the Glow Plug Relay went out on his truck he could crank it all day and it would not start. I would check out all those things then go from there.
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2005 6.0 Crew Cab Long Box Lariat, current truck
2004 6.0 destroyed by contaminated fuel
2002 7.3L burnt