2003 3500hd no start

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  #1  
Old 02-04-09, 05:37 PM
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2003 3500hd no start

Alright guys and girls put on your thinking caps. 2003 chevy 3500hd, 6.0l Vortec v-8, when ambient temp is 30f and above it will crank and run like normal, below about 25f it will not start, turns over normally but will not start. This engine has 8 ignition coils, have checked fire on 3 or 4 and had fire on them. Changed coolant temp sensor. Truck is about 6 hours away from me and I am trying to fix it over the phone, any ideas will be appreciated.
 
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Old 02-05-09, 04:14 PM
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No takers?? Glad to see I am not the only one who is stumped.
 
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Old 02-05-09, 05:05 PM
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You only checked 3 or 4 of the coils? What about the rest of them? No too familiar with HD's or powerchokes. Drive a Cummins. No glow plugs, just a heater grid on the intake. Seems like Chevy and Ford are trying to make their diesels too complicated. Wish I had more info for ya. We've been 6 degrees north of you for the past few days, so plugging it in helps alot!! In addition, you have warm water to operate your defroster right away rather than having to wait 10 miles for it to heat up enough.
 
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Old 02-06-09, 04:11 AM
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It is a gas engine Chandler. I checked a few of the coils when they were firing I assumed the others were also working.
 
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Old 02-06-09, 04:31 PM
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since you have changed the temp sensor, I would head in the direction of the mass air flow sensor or map sensor,next time it gets cold try disconnecting the maf and see what happens,or if you have diag equipment check the barometric pressure.
good luck,
 
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Old 02-06-09, 06:06 PM
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Have you checked to see if any codes are stored, 'twister? Beer 4U2
 
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Old 02-08-09, 11:23 AM
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No codes tow guy. Talked to the guys at the local GM shop and they all said fuel pump. Evidently the general is having some fuel pump cold soak issues, will put a gauge on it when I go out there if it gets cold enough to cause the problem.
 
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