2006 Hummer H3: misfire or rough idle

Filed Aug 27, 2024 · Engine · FL

Was heading home from work and the 2006 Hummer H3 shut off while traveling in the middle of traffic was able to cruise in Nuetral until I could stop to start car again started car and yet again I receive a cylinder misfire code which has been repaired on multiple attempts still no success. I am going to end up either crashing or an emergency vehichle will be trying to get by and I can't move because the motor shut down.

Filed Aug 22, 2024 · Engine · FL

Engine has very bad rough idle after multiple attempts to repair will get a misfire code often that goes on and comes off engine has rough idle to the point where truck shuts off completely while waiting at traffic light. My safety is at risk as this could happen during driving causing a wreck or during a light change when the emergency vehicles need me to move over and my truck don't run. Vehicle was inspected by multiple mechanic and still has issues. Check engine light comes on at time of motor failure or when rough idle.

Filed Feb 25, 2019 · Engine · 130,000 miles · NV

P0300 code. Engine misfire. The hummer forums I've researched say it's a common problem in these cars, manufactured before march 31, 2006. It seems the engine heads do not have properly hardened valve seats. Again, I'm finding this is a common problem and gm is fully aware of it.

Filed Jun 17, 2017 · Engine, Wheels · 100,000 miles · ME

1) 1.5 years ago we started getting "misfire on cylinder 5" code and now it is multiple misfires. 2) my fancy rims are peeling

Filed Jan 24, 2017 · Engine · 95,000 miles · TN

There are many forums about cylinder misfires - especially after the warranty runs out. I looked it up and was shocked to see how many other people have had the same issue and nothing has been done about it. Every hummer owner I know has paid thousands of dollars to get their problems fixed. Why is there not a recall when so many have the same problem?? The idle is rough. The engine sputters. The light goes on and off constantly.

Filed Jan 14, 2017 · Engine · 100,231 miles · MA

I purchased a 2006 hummer h3 with only 100k, after performing a complete service I was made aware the cylinder heads are "defective" the vehicle was driven for 5 monthe then the check engine light came on.. A code scanner indictacted a #2 cylinder misfire replaced spark plug, coil pacack and injector no luck I was informed cylinder head need to be replaced, at what cost does the federal safety agency realize that this was a major manufacturing defects, yes gm replaced cylinder heads under warranty but with the same defective heds as to pass on the cost to the consumer as soon as the warranty expire to get their warranty money back., there has been numerous complaints and yet nthsa refuses to inform gm of the "defect" it seams all the ntsha cares about is electrical concerns on vehicles, so who make the determination the a poor designed cylinder head should be the consumers problem. This is where an individual should be held accountable, it took a threat from the federal safety agency for gm to issue a recall on the HVAC connector to get resolved., if the federal safety agency cannot understand mechanical defects should there be a recall when more than 500 complaints are achieved. So now I am out of pocket $2800.00 thanks to a administration that has no clue on mechanical issues. You should hire an individual who has mechanical degree to hold car companies responsible for poor mechanical issues so will I receive a response to this issue as we all know gm has informed dealers to give customers excuses as to why they are not liable, my conclusions indicate that the federal safety agency only acts on air bags brake switches and electrical issues nothing mechanical.....

Filed Oct 21, 2016 · Engine · 70,000 miles · TX

Tl* the contact owns a 2006 hummer h3. While driving at an unknown speed, the check engine warning indicator illuminated. The vehicle was taken to an independent mechanic who diagnosed that the second cylinder was misfiring and the head gasket and/or cylinder needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 70,000. The VIN was unavailable.

Filed Nov 12, 2015 · Engine · 133,338 miles · NV

Tl* the contact owns a 2006 hummer h3. While driving at 65 MPH, the check engine light illuminated. The vehicle was taken to an independent mechanic for diagnostic testing. The contact was informed that there was a misfire in cylinder number four. The vehicle was repaired, but the failure recurred. The manufacturer was notified of the failure. The approximate failure mileage was 133,338.

Filed Nov 19, 2014 · Engine · 74,188 miles · IL

Rough idle, engine light appears. In past have been told have been told gas cap related or poss thermostat or intermit misfire. Today dealership says cylinder #2 not working. Need to replace. At a cost of $3000+. Related to l52 engine concerns & intake valve seats. Including colorado & canyons. Why are some recalled, and/or fixed on manufacturer's dime, but not others? Gm knew of concern, (thus changed to llr engine). Mine fits the year and well below the VIN #. Why should 287591 h3 owners have to pay for gm's mistake?

Filed Nov 10, 2013 · Engine · PA

First of all, the date of the incident is very vague considering it's been happening most of the life span of the vehicle. Ever since the vehicle reached 30,000 miles the check engine light has been going on and off periodically. Now there is around 85,000 miles and I can honestly say the check engine light has been on for most of the life of the car. The code is always p0300. This is due to a random misfire in the cylinder heads. I have had this car long enough to say this typically happens during idle. This car has always had a rough idle. I would say ten percent of the time it's a smooth idle. I always use good gas, clean oil and up to date maintenance on this vehicle and I never stress the engine due to it's feeling of it being so fragile. Going online I am astonished to find so many with the same exact problem. Gm had the same recall on the inline 5 cylinder canyon cylinder heads. This is the same problem we are having with our inline 5 cylinder engine heads. Gm needs to put this on recall. Fix their mistake and keep this check engine light from going on every time I park my car, start my car or simply idle. Many would be grateful if this was recalled.

Filed Mar 17, 2013 · Engine · 42,000 miles · MA

I went in to dealer for what I called a fluttering periodic idle. They took a look $200.00 later told me I had misfire in #2 and #5 and needed new head. You can imagine my comments and he said it is common he just did one last week on the same year and type h3! Well I was in touch with gm - the car is out of warranty but low mileage. They did cover a portion and I was responsible for the rest. Well I pick up week later. Was told it was test driven and runs great. I told them it ran great before just the fluttering idle when I stopped at a light. They said you are all set.. Many bad words escaped my mouth when I drove home and it was not fixed. The vehicle still drove the same way it did before and the flutter was still there,. So now I have to bring it back again and I made the tech get in the vehicle so he knew what I was talking about and he said well it was brought in for a misfire. Uhhh no it was not. Why has gm not done any type of recall on this if it is known problem. Feel like they don't care since the vehicle is not made anymore what does it matter to them. I could continue but am limited to characters.

Filed Jan 26, 2013 · Engine · 79,998 miles · MO

The check engine light went on and off. The vehicle was taken to a mechanic who diagnostic as cylinder #1 misfire. Compression test failed due to cylinder leakage. The main problem was to at the time of manufacturing the engine soft metals were used with the heads. I was told I need to replace cylinder head and related parts. Contacted gm hummer division informed them of my problem with my 3.5l, 5 cylinder engine and ask them for assistance since they did a special extended warranty for the 2006 colorado and canyons with the same engine problems. They refused to help.