02 duramax wont start - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 07-29-2012, 01:31 PM   eBay Motors  #1 (permalink)
 
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02 duramax wont start

have an 02 duramax that wont start. tried a new primer pump checked compression good,had rpm on scan tool no codes, sounds like its out of time so pulled front cover and not seeing anything out of wack . put little ether on a rag and still doesnt even try. anyone have any suggestions?
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Old 07-29-2012, 01:34 PM   eBay Motors  #2 (permalink)
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Welcome, any codes?
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Old 07-29-2012, 01:50 PM   eBay Motors  #3 (permalink)
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You getting fuel to your fuel filter .
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Old 07-29-2012, 01:52 PM   eBay Motors  #4 (permalink)
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So we'll assume its cranking, just not starting. Could be sucking air, bad injectors, cp3 shot.
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Old 07-29-2012, 02:21 PM   eBay Motors  #5 (permalink)
 
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ya it cranks but wont run i replaced the fuel primer assemebly and it pumps up and gets hard . no codes . but shouldnt it try to start on ether? even if it had bad injectors
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Old 07-30-2012, 01:23 PM   eBay Motors  #6 (permalink)
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dont use starter fluid with the dmax. do you have access to a programmer that reads diagnostics? it would be good to know your actual fuel rail pressure to confirm you're getting fuel and how much. you could have a buddy pump the primer while you try to start it. there are quite a few causes for these not starting.
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Old 07-30-2012, 01:33 PM   eBay Motors  #7 (permalink)
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Happened to me a few times
And I just primed the piss putt it and it would start. Sounds like you've tried that thought :/


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Old 07-30-2012, 06:33 PM   eBay Motors  #8 (permalink)
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sub'd. currently having the same problem as the truck sits in the drive way. it is driving me insane. I know my injectors need replacing but the truck ran that night and then wouldnt start the next morning but it will crank all day long. can a injectors get stuck open or maybe fprv get stuck and cause this?
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Old 07-31-2012, 07:48 AM   eBay Motors  #9 (permalink)
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redneck - what is your rail pressure demand and actual. a stuck open injector could cause your starting issue. however if it happens to you when your truck sits overnight, you are likely losing prime, it appears from your sig you do not have a lift pump, so it could be prime. I'm in CT too, and my supply lines are rusted, and i had to replace a part of the 1/2" supply line near the return fuel cooler. I had the exact same issue, crank and crank. i noticed a fuel drip near the tank. fixed that, problem gone.
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Old 07-31-2012, 08:15 AM   eBay Motors  #10 (permalink)
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I know it sounds crazy, but check the bleeder screw on the fuel filter housing. Mine was stripped out and the truck would crank all day with no fire. It was sucking all kinds of air through that screw.
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