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02-17-2013, 02:11 PM
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#1 |
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Registered User
 Join Date: Dec 2002
Location: Northern Virginia
Posts: 1,268
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03 GMC 8.1 coil packs
Chasing a rabbit! 03 2500 HD 8.1 has 125k on it. The past few years in the winter when the temps change if you ran it a short distance and turned it off it didn't want to start the first few times or would cut off. Doing normal maintence
changed plugs and wires and fuel pressure regulator. Replaced coolant temp sensor and crankshaft positioning sensor. It still has the problem. After it starts I sometimes smell gas. It has sprung no trouble codes. Not sure about the coil packs. When you change or how you know one is weak or going bad. Thanks |
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02-17-2013, 04:58 PM
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#2 |
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Senior Member
 
Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,238
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Re: 03 GMC 8.1 coil packs
i've been in the auto repair for many years and have yet to see a coil pack fail on any of the 5.3ls though the 8.1s
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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02-17-2013, 08:36 PM
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#3 | |
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Registered User
Join Date: Nov 2008
Location: manly iowa
Posts: 390
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Re: 03 GMC 8.1 coil packs
Quote:
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02-20-2013, 10:31 PM
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#4 |
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Future TOTM Winner
Join Date: Aug 2006
Location: Bulverde, TX
Posts: 2,692
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Re: 03 GMC 8.1 coil packs
EDIT...nevermind, you already tried my suggestion.
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72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com Last edited by Critter; 02-21-2013 at 12:46 AM. |
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02-21-2013, 10:37 AM
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#5 |
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Registered User
Join Date: Dec 2002
Location: Northern Virginia
Posts: 1,268
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Re: 03 GMC 8.1 coil packs
Changed the fuel pressure regulator yesterday. When I pushed the valve on the fuel rail to relieve the pressure it had a ton on it. What was different. When I pulled the old regulator the bowl filled up with gas. I dried it out and it did it again. Put the new one in worked fine yesterday. This morning the same thing. started right up ran for 30 minutes. went inside came back hour later didn't want to start. finally did and I smelled gas. It finally gave me one code for bank one senor one oxygen sensor.. haven't changed it out yet. Cleared the code to see if it would do it again but it has not
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