We are having a simular problem with our 2008 G6 GT. 3-4 shift makes a loud vibration the car sometimes, but the dearler cannot find any problems.
My 08 was destroyed by hail so now have a 10 G6 which has a similar problem. I believe the TCC never locks up on this one. Looking for a way to verify this before taking it to a dealer for waranty repair.Just took the dealer's transmission mechanic on a test drive. He said they are making torque converters different than they were a few years ago and that it is normal operation. Said that if there is too much slippage, it will set a code and turn on the check engine lamp.
My mistake, I didnt see that you had the 2.4Thanks, but the 2.4 doesn't have plug wires. Coil-on-plug does away with lots of possible problems. Took to dealer yesterday but they had 7 tranny problems waiting for their only tranny mechanic. Will try again next week.
I actually figured it out the hard way, got a nice little shock when I was messing with the wires, the insulation had started to break down on one of them, not sure why but probably from the heat since they lay right on top of the intake. It ran fine idling and at high rpm's, but stuttered and had rpm fluctuation between 50 and 60 mph when going up hills. Changed wires and plugs and problem completely gone. Figured the wires were arching across each other because there was never a DTC for misfiring.Hi,
How did you find the arching, did you see it?
I will take a look this weekend.
I have been in and out of the dealer 3 times now. I also been in contact with customer service and thet been helpful getting my car looked at but that's it so far.
Ok, That sounds interesting. Because the service manager at the dealer said he has seen something like that, but instead of the wires it was a cracked spark plug, no codes.I actually figured it out the hard way, got a nice little shock when I was messing with the wires, the insulation had started to break down on one of them, not sure why but probably from the heat since they lay right on top of the intake. It ran fine idling and at high rpm's, but stuttered and had rpm fluctuation between 50 and 60 mph when going up hills. Changed wires and plugs and problem completely gone. Figured the wires were arching across each other because there was never a DTC for misfiring.
No its not really too bad. I'm assuming you have the 3.5 as I do. For the front 3 you can just take off the air intake tubing and get to the front plugs fine, the back 3 are a little tricky but with some patience you can get to them ok. I have read that you can even unbolt the alternator to make accessing the rear plugs a little easier, but I did not. A piece of rubber hose that fits over the top of the plugs makes putting them in a little easier, it prevents you from crossthreading them when you start.Ok, That sounds interesting. Because the service manager at the dealer said he has seen something like that, but instead of the wires it was a cracked spark plug, no codes.
So was it hard to replace the plugs? I have 50,000 miles on my G6 GT, I think I would do the same and see what happens.
I used the stock plugs, what GM recommendsHi, Yes I do have 3.5. I'll give it a try. One more question: did you use any special spark plugs or just what GM recomends.
/quadcells