A tough one....

[Racer-X]

Driving home from a great wheeling trip (I'll post pics later) last night my rig started to hesitate. The best way I can describe it is - it felt almost like it was running out of gas or I was losing spark momentarily. It got worse under load (climbing a hill) but also did it on one section of downhill.

I got no check engine light. I'm pretty sure onstar can't diagnose unless there is a check engine light but I tried anyway - onstar said no codes.

All guages in normal range.

Normally I would have pulled off the road and had it towed just incase whatever was going on would do any damage but I was depsarate to get home because I had found while I was gone my wife became very ill and was at the hospital, so I pushed it.

The last 5 miles or so it just stopped doing it. Ran fine.

It did this same thing for a shorter period of time about a month ago in death valley. I dismissed it as fluke because I was running a really rough rd at about 60mph - it stopped after about 3 minutes and I drove it home (500 miles) without any problem.

This is going to be one of those issues the dealership will tell me they "can't reproduce" and there is no failure code.

Any ideas?

[tomp]

Fuel pump/filter?

[RIC-H0]

Originally Posted by tomp

Fuel pump/filter?

Was your fuel level less than 1/3?
It sounds like your fuel pump may have started to overheat, and run rough. So you were basically running out of gas to the engine.
I'd try running it low on gas for a while, and see if it happens again.

IMO...

Ric

[Racer-X]

3/4 of a tank.

I got under the truck this morning. Tranny fluid everywhere. Radiator full of tranny fluid AGAIN! This has happened before and the symptoms were very different.

Last time the tranny slipped and overheated. Neither one of those this time.

Pretty discouraging. I won't be able to afford to keep my H2 when it's out of warranty.

[RIC-H0]

Originally Posted by Racer-X

3/4 of a tank.

I got under the truck this morning. Tranny fluid everywhere. Radiator full of tranny fluid AGAIN! This has happened before and the symptoms were very different.

Last time the tranny slipped and overheated. Neither one of those this time.

Pretty discouraging. I won't be able to afford to keep my H2 when it's out of warranty.

So does it seem as if a line was broken to the tranny cooler in the radiator. Does your tranny have liquid in it(Foamy& milky)?
I'd start looking into a possible lemon law issue.

[Racer-X]

Both tranny and radiator have fluid and water in them. Looks like pepto-bismol.

Last time it happened, tranny, radiator, overflow bottle and all hoses were changed.

I'm thinking of installing a separate tranny cooler. Ideally completely eliminating the radiator cooling the tranny fluid. Don't know if thats possible though.

I thought lemon laws only applied for the first year?

[MarineHawk]

Originally Posted by Racer-X

Normally I would have pulled off the road and had it towed just incase whatever was going on would do any damage but I was depsarate to get home because I had found while I was gone my wife became very ill and was at the hospital, so I pushed it.

Hope your wife is okay.