Hummer Problems!

[HummerNewbie]

Originally Posted by MtnHmr

The check engine light and rough idle was explained to me as follows by GM: As I descend the hill with my foot off of the gas pedal the car thinks it should be at idle. As the descend continues the rpm may rise slightly due to the steepness of the hill. Because the computer is confused by the rise in rpm it reacts and shuts off the gas to the motor.
For those of you you take your rigs off road you know how dangerous this could be especially if the motor was to die. Compression braking would be lost as well as your brake assist. I feel that this is totally unacceptable for a vehicle that was designed to be used off road.

Wouldn't you get the same thing driving down the highway when you let off the gas going down a hill

[MtnHmr]

I have never had that happen but it is a good thought. When I am off road it seems to take a good long hill to make it do its thing. When I am on the road, I don't think my foot is ever off of the gas pedal that long.

[HummerNewbie]

Being in FL I usually don't come across hills long enough that I would think it would happen either but just a thought. I would bet they would explain that away as having to do with what gear you are in too.

[Wisha Haddan H3]

Originally Posted by MtnHmr

I have never had that happen but it is a good thought. When I am off road it seems to take a good long hill to make it do its thing. When I am on the road, I don't think my foot is ever off of the gas pedal that long.

I test drove a manual w/ adventure package on the hill behind the dealer. The hill was only 20 yards long or so, but we idled down in 1st gear, 4-lo locked (foot off the gas) with no engine problems or lights. If this engine stalling is "normal" for the manual H3, I might order the automatic instead.

A lot of H3ers went to Moab last month and posted pix on the board. Did any of them have a 5-spd? Seems like Lion's Back and some of the other obstacles would have triggered this behavior.

[NEOCON1]

only autos on lions and no problems

[blindzebra]

Mine is a manual and I've never had rough idle descending in 4low lock. The tcs will come on, but no engine light. I don't know what to tell ya.

[H3HUMVEE]

I also have the manual transmission ... I have descended a few hills in low lock with no problems, however nothing near that long.

[RIC-H0]

I think if you mention to then that it could be a possible law siut waiting to happen, they may react differently.
Give them the scenario of you and your ill mother, and 5 children are in the vehicle on a rainy night, going down the side of a hill, trying to get medication(For yourself of Course), and the engine decides to "React accordingly". You lose all braking control, crash, roll, spin, spit, flame, and all die!!!
See what they say then!