wheelin today and a couple of issues

[timgco]

Went out wheelin today with the CO group. Had a blast. The H3 did very well with two exceptions.

1) I got up to around 13,000 ft and the truck started sputtering and I had almost no power. Foot to the floor in 4LO locked and wouldn't move but 1 mph. It did this for a couple hundred yards. I shut the truck off, and the problem stopped, but the check engine light was still on. I cycled the engine on and off a few more times and still no problem and the check engine light out.

egine power reduce, stabilitrack off, stabilitrack failed. It flashed these over and over durring those few hundred yards, had the little engine light on, and than it went back to stabilitrack off. no more issues.

2) The dumbass that changed are oil last didn't put the bolts back into the skid tight, so we lost one and the other was barely hanging in there. Also missing were the two bolts to hold the UC protection through the skid plate. Anyone know what size bolts I need to get for the back of the first skid plate that has the H3 logo on it (need two) and also for where the next shield goes where the UCP protection mounts to (also need two)

Other than that, it was a lot fun today!!!!!

[HummerNewbie]

Sorry about the issues Tim but glad you had a great time. I would also like to thank you for reminding me I need to climb under there and check all the bolts before the upcoming trip

[marin8703]

One reason that I know of the engine going into reduced power would be high temp. If it over heats it goes into reduced power mode in an effort to reduce engine temp by reducing power output while keeping fan and cooling system at max.

I would have said its normal for all vehicles to loose power with altitude increase because of lower concentration of oxygen which is needed for combustion to occur, but since it was ok after restart it leads me to believe its an overheating issue. I might be wrong, wouldnt be the first time!

oh and it also could have detected a misfire and went into "protect" (reduced engine power) in order to prevent it from misfiring again, keepin the engine safe or sum like that.

What was your temp gauge showing? and what temp were you playin in?

hope i was of any help.

[timgco]

[quote=marin8703]One reason that I know of the engine going into reduced power would be high temp. If it over heats it goes into reduced power mode in an effort to reduce engine temp by reducing power output while keeping fan and cooling system at max.

I would have said its normal for all vehicles to loose power with altitude increase because of lower concentration of oxygen which is needed for combustion to occur, but since it was ok after restart it leads me to believe its an overheating issue. I might be wrong, wouldnt be the first time!

oh and it also could have detected a misfire and went into "protect" (reduced engine power) in order to prevent it from misfiring again, keepin the engine safe or sum like that.

What was your temp gauge showing? and what temp were you playin in?

hope i was of any help.[/quote
Thanks for the input. The truck did have multiple missifres in a row while it was doing this. The temp stayed the same all day at normal.

I did have this happen in my SUT when I had it. It needed a computer upgrade and a new fuel pump/ sending unit, but the engine light never went back out. Same symtoms at altitude only.

[usetosellhummer]

bummer

[HummBebe]

I'd say it was a dealer issue for sure.

Although, mine has had brain farts, I mean computer brain farts.And as you cycled a couple of times and it went away, so did mine.

13,000ft is proabably the highest and H3's ever been, LOL, you may be breaking the altitude record.

It is possible to have a bad temp sensor, you may have been running hot and not known it.


Good luck

[lotus4s]

Just a WAG (wild ass guess) but maybe the ECU was confused on the air/fuel mixture due to the altitude and needed time to readjust the parameters.....

[Michael1]

Originally Posted by HummBebe

13,000ft is proabably the highest and H3's ever been, LOL, you may be breaking the altitude record.

GM tests to the top of Pike's Peak, which is 14,110 feet, so he should be OK there. I would say Stabilitrak engaged for some reason, and cut power.

Michael