Hello all!
I am new to the forum and a (somewhat) proud owner of a beautiful yellow H3 with 77K miles on it.
Problem is: once it reaches operating temperature it stalls at nearly every stoplight and stumbles whenever RPMs drop below 600. I was once turning to cross a three lane roadway and it stalled in oncoming traffic (really bad). I plugged in my OBD and it read that the thermostat needed replacement. When I replaced that it said the thermal sending unit was the issue. Replaced that too.
Reading all the forum info I could find(so far) I have done the following myself : 1) replaced the battery. 2) replaced the air filter. 3) replaced the thermostat. 3) replaced the thermal sending unit. 4) cleaned the mass air sensor. 5) cleaned the throttle body. 6) pumped ONLY 91 octane and added octane booster to every tank for 3 tanks.
No change whatsoever. Stalls at every stop when the engine is at operating temp. It was throwing absolutely NO ENGINE CODES on the OBD??!!
I felt I have a problem that exceeded my mechanical skills at this time. I took it to a well-known established local dealer: CRAWFORD BUICK/GMC here in El Paso, TX. After their diagnosis I was told it needed to have the camshaft intake /exhaust sensors replaced. Sweet
- ONLY $1300 to fix and I'm back on the road!! I received a military discount which brought me to @ $1000 out the door. Yay.
The day I picked it up I drove home and was happy for a minute
. The next day I went to a store after a 10 minute drive on the highway and the dang thing stalled in the parking lot. Furious now I returned the vehicle to CRAWFORD BUICK/GMC in El Paso, TX. After a few days I received a call from them telling me that I needed a new cam chain---to the tune of $1500. At this point I felt I had no choice so I paid and left the dealership HOPING I would NEVER darken their door again. Guess what?
YES the GD Hummer H3 died on my way home AGAIN!!!!!!!!!!!!!!!!!!! Returned the truck to CRAWFORD BUICK/GMC who had the H3 for another 2 weeks before I was informed that they had replaced the throttle body, torque converter, and inspected all ground cables to no avail. They informed me that I now need to replace either the heads or the entire freaking engine due to low vacuum. To the tune of $6000-8000 dollars. (For real).
Really? After spending $2500 on repairs (apparently stuff that the truck didn't really need) AND they were working with GM engineers to figure out what the heck is going on with this motor??
My question is: has anyone else had an issue like this??????????