Misfire After Headgasket Replacement! - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY 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, Etc.

 
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post #1 of 5 (permalink) Old 12-09-2019, 02:05 PM Thread Starter
 
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Misfire After Headgasket Replacement!

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About a month ago I started HG replacement on my 05 Duramax. I had heads planed, used ARP studs and put all back together with the MAHLE grade c gasket kit. After putting back together, I had an engine misfire with haze at idle which the scanner said it was number 6. I tried swapping injectors around but the misfire seems to stay with the cylinder. Checked my balance rates yesterday and they are attached. Number 6 is way out and injector 1, 2, 4, and 5 are all -7 (the interesting thing is these 4 injectors always read the exact same numbers to eachother. To clarify, they all fluctuate but they all read the same always) At first I thought it was a bad injector but now I'm starting to lean towards possibly bad wiring/bad FICM. I have inspected the normal wear spots for the wiring harness and they seem to be fine. Please Help
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2005 Chevy 2500hd Duramax
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post #2 of 5 (permalink) Old 12-09-2019, 02:23 PM Thread Starter
 
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P.S. The only code it is throwing is a U0106 (not communicating with glow plug module) which it did not throw before HG replacement

2005 Chevy 2500hd Duramax
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post #3 of 5 (permalink) Old 12-09-2019, 03:00 PM
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Check the injector pigtail for that injector. If it’s loose change it. Try the ice pick fix first to see if it goes away. If it does new connector and you should be good. I changed #2, #7, #6 and #3.

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, LMM Resonator Box, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 260K and still going strong,
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post #4 of 5 (permalink) Old 12-10-2019, 11:35 AM Thread Starter
 
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I did try ice picking the number 6 Injector it did not seem to make a difference

2005 Chevy 2500hd Duramax
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post #5 of 5 (permalink) Old 12-10-2019, 05:56 PM
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Try some hot shots secret diesel extreme. See if the injector clears up.

04.5 CHEVY 2500HD CC/SB LT-Green, 2" Leveling Kit, Bilsteins, Wicked Wheel 2, Boost Stick, 4" MBRP Turbo Back w/ 5" tip, LMM Resonator Box, Airdog LP, PCV reroute, Airbox Mod with AFE Filter, LBZ MP, Fleece Tapshifter, EGR Delete, Edge CTS2, Mishimoto Trans Cooler, EFI Live Tuned/ Idaho Rob,5% tint, 260K and still going strong,
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