RE: H3 Idling Rough - Head Problems?

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RE: H3 Idling Rough - Head Problems?

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Hummer >> Hummer Lineup >> Hummer H3 >> H3 Frequently Asked Questions >> Head and Valve Problems. >> RE: H3 Idling Rough - Head Problems?

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RE: H3 Idling Rough - Head Problems? - 1/16/2007 9:06:46 PM

kild1

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quote:

ORIGINAL: importkiller

easiest way to see if your check engine light works is to not put the gas cap back on. You'll get the light for that too. I've had that happen a few times to me already.

yep that will work too and filling up w/ gas w/ the motor running will do it to

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07 H3X Sonoma Red Metallic

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Post #: 16

RE: H3 Idling Rough - Head Problems? - 1/16/2007 10:05:04 PM

importkiller

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don't think filling up with the motor running will trip the light if the cap is put back on tight. I have never shut the motor off while getting gas and as long as the cap is put back on tight the light never comes on. Theres a vacumn sensor or something in the system for the cap.

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Post #: 17

RE: H3 Idling Rough - Head Problems? - 1/16/2007 10:26:06 PM

Dennis

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The system only checks this gasoline vapor emission system after you have driven 20 minutes or longer and then only after you turn the key off and stays off for 10 minutes or more..Only then will it store a code and indicate on the next start up (SES) and will correct itself if the cap is placed on properly during or before the next full cycle as stated

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Post #: 18

RE: H3 Idling Rough - Head Problems? - 1/16/2007 10:51:41 PM

importkiller

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I duuno, maybe like the TPS system mine is messed up. All I know is that if I get gas and don't put the cap on tight my light will turn on in less than 2 miles....every damn time. It's like clockwork.

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Post #: 19

RE: H3 Idling Rough - Head Problems? - 1/16/2007 10:55:16 PM

Dennis

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Hmmm..Interesting..yours does have some out of the ordinary chit going on..for example the terrible gas mileage, but runs faster than any other stock H3 on the road...That one really blows my mechanical mind.

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Post #: 20

RE: H3 Idling Rough - Head Problems? - 1/16/2007 10:59:10 PM

importkiller

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don't know about any other stock h3 on the road, but I know I was faster than the one I ran against.

I love the h3 as a truck...I just hate mine. Which Is why I said for my one year anniversary that I was going to drive it off a bridge

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Post #: 21

RE: H3 Idling Rough - Head Problems? - 11/21/2007 5:14:30 PM

mjsieloff

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I am having the same problem. I have a 2007 H3 with a little over 2,000 miles and it just started a few hundred miles ago. (Rough idle) When I took it back to the dealer they told me that it was normal that it is a unbalanced engine and that is a draw back to the V5. That is wierd to me because it didn't do it when I brought it. This just started shortly after putting in a new radio then traction control button stopped working as well around the same time? Why is the MAF??

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Post #: 22

RE: H3 Idling Rough - Head Problems? - 1/24/2008 8:02:17 AM

lmhummer

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quote:

ORIGINAL: PhxRealtor

My H3 with about 17,000 miles started to idle rough a while back. Otherwise it seems to run good. No real loss in power. I'm wondering if this means I have head/cylinder problems? It seems to get worse if I use certain electrical items when idling, like power windows or step on the brake etc.. Just wondering if anyone has any insight on this. Mine was one of the earlier 2006's built.

My H3 was built in March 2006 and has had this problem, plus many more.

The rough idle started at about 20,000 on mine. Over the course of a month it transformed from minor shaking in idle and steering wheel vibrations, to dropping rpms in 1st gear while driving and at idle. Eventually the engine light came on flashing (along with shaking like I was driving over rocks) and OnStar ran a diagnostic. Misfire signals, said it should not be operated to prevent serious, permanent damage and it had to be towed in.

It is definitely worse when you brake, use A/C, other electrical. After the repair, my battery started going dead frequently and they just replaced it. Only at 24,500 miles.

I was told that the car had been running on 4 cylinders, likely since mile one because of bad valve casting- replaced the head. They said they repaired it, but it is still idling rough, worse in reverse, and the Dealer said they do not see anything wrong.

I also had the heater core fail at 9,000 miles when it was 38 degrees outside. Windows began fogging followed by anti freeze spewing through air vents while I was driving. Ever since the repair, the passenger side has a rattle- which dealer has said they repaired, but still makes noise.

Am on 4th chrome grill because of #1's chrome flaking off, the repair people ruining #2 when working on the head/valve problem, and the 3rd one developing orange oxidation spots all over.

I wanted to love this vehicle, but I am sadly dissapointed.

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Post #: 23

RE: H3 Idling Rough - Head Problems? - 1/24/2008 11:03:56 AM

alrock