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08-26-2008, 01:27 AM
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Hummer Professional
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Join Date: Sep 2006
Location: Arkansas
Posts: 363
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Re: P0300//mulitiple misfire
Have the dealer run your vin and see if yours was in the batch that had poorly hardened valve seats or guides or both or whatever they did wrong. That might be it. Those are all the symptoms and they will not go away if that is it. It usually shows up before that many miles "if" that is the problem.
If so,
__________________
Traded 06 I-5 for 08H3 ALPHA/Adv,WarnPowerPlant9500,Warn 9000ti rear,Steelcraft brush/winch mt,RockyRoadrails/Hunner mod,GMUCP,Hunner rear/shock skids,OEM roof lights,Rola rack,2GoLights,Hunner steering gear mount,Purple Cranium diff guard,BulletProof tie rods,ARBsnorkle, SyKlone prefilter,Hunner intake pipe.
Last edited by Hunner : 08-26-2008 at 05:00 PM.
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08-26-2008, 02:02 AM
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Hummer Veteran
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Join Date: Mar 2008
Location: Syracuse, UT
Posts: 60
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Re: P0300//mulitiple misfire
If you narrow it down to a fouled injector (either by swapping with an injector from a cylinder with no misfires or injector balance test) then I would probably just replace it. I say this not knowing how much an injector for the H3 is, but I haven't had very good luck cleaning injectors. Please keep us informed as to what you find
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08-26-2008, 04:11 PM
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Hummer Expert
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Join Date: May 2005
Location: Southern California
Posts: 829
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Re: P0300//mulitiple misfire
I'd say it is the cylinder head!
Take it to the dealer and get it fixed if that is the problem.
__________________
Desert Dan
H3 2006 Adventure/Lux/5-speed/sunroof/rock rails/underbody skids/block heater/Boulder Grey/ Defender Roof Rack
Jeep TJ Rubicon 2003
1988 Jeep Cherokee
Gone - But- Not Forgotten 4x4's
1994 Jeep YJ
Toyota 4x4 Truck(s)
1970 Jeep CJ-5
1962 Willys Wagon
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08-26-2008, 04:58 PM
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Hummer Professional
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Join Date: Sep 2006
Location: Arkansas
Posts: 363
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Re: P0300//mulitiple misfire
Like Ryan said, get them to do a leak down check. That was how they confirmed my problem. They have done several at the small dealership I go to.
__________________
Traded 06 I-5 for 08H3 ALPHA/Adv,WarnPowerPlant9500,Warn 9000ti rear,Steelcraft brush/winch mt,RockyRoadrails/Hunner mod,GMUCP,Hunner rear/shock skids,OEM roof lights,Rola rack,2GoLights,Hunner steering gear mount,Purple Cranium diff guard,BulletProof tie rods,ARBsnorkle, SyKlone prefilter,Hunner intake pipe.
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08-26-2008, 11:31 PM
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Elcova Rookie
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Join Date: Aug 2008
Posts: 7
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Re: P0300//mulitiple misfire
Update::
I have introduced the fuel injection cleaning solution in the system, actually several bottles (gradually) and I can feel a better/stiffer pedal. I run the live datastream while I am driving and all cylinders show "0" misfires count. While I let the engine idle I show no misfire count on any of the cylinders but # 3 (before that it was all of them)but I must say that they are very few now, not as before. I believe I just had very dirty fuel injectors(especially #3). Overall engine performance has been great even before I noticed anything, usually with a misfire error the engine idles very rough but not in this case. If I have never ran a live datastream test I would never know there was an issue, usually most folks run a scan to check why the check engine light has come on. I will be keeping an eye on this and see what happens. I am very hesitant to take it to the dealer because I have bad service in the past ( another issue for another day)and I don't trust them and the bad thing is that here only dealer here in Hawaii.
Thanks to everyone with your input.
JJ
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