AZSCTACO
Full Access Member
My fuel pump went out at 90K miles on my 07 Tahoe. Mine never stalled out but I did experience the "extended crank".
'07 Denali hot stall?
- Thread starter cvdaddy
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My fuel pump went out at 90K miles on my 07 Tahoe. Mine never stalled out but I did experience the "extended crank".
Hot Engine Stall with 08 Denali XL
I have a 08 Denali. After driving for extend period, we pull up to a stop and the engine idles rough dies. Will restart after awhile. So far it has happend 4 times. First time it restarted after a few minutes. After the second it was towed and the dealer replace the throttle body (we were stranded out of town waiting for it to be fixed). After third time (it restarted and we got home) dealer cleaned some connections (said it was related to grounding). Forth time the car did re-start and we were able to get off of the hwy and into a parking lot. We let it cool off for about an hour while we had lunch. The next day we came back home (~200 miles) with no problems. The car is at the dealer again to see if they can find something. But every time, when the motor dies, it has the same symptons of not restaring until it has cooled down some, it sounds like it is not getting fuel, and you hear a "gasping" sound at the end of the attempted start. The car has 62000 miles. Events 1, 2 & 3 happend in July 2011 (+90 deg F). Event 4 happen in Dec 2011 (~70 deg F).
I have a 08 Denali. After driving for extend period, we pull up to a stop and the engine idles rough dies. Will restart after awhile. So far it has happend 4 times. First time it restarted after a few minutes. After the second it was towed and the dealer replace the throttle body (we were stranded out of town waiting for it to be fixed). After third time (it restarted and we got home) dealer cleaned some connections (said it was related to grounding). Forth time the car did re-start and we were able to get off of the hwy and into a parking lot. We let it cool off for about an hour while we had lunch. The next day we came back home (~200 miles) with no problems. The car is at the dealer again to see if they can find something. But every time, when the motor dies, it has the same symptons of not restaring until it has cooled down some, it sounds like it is not getting fuel, and you hear a "gasping" sound at the end of the attempted start. The car has 62000 miles. Events 1, 2 & 3 happend in July 2011 (+90 deg F). Event 4 happen in Dec 2011 (~70 deg F).
Last edited:
edgaranah1
Full Access Member
Thermostat? maybe.
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stevek
Full Access Member
That sounds REALLY high especially considering that the Denali's all have aux tranny coolers
BilliYo
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Anyone still around & figure it what this issue is? I have the same thing going on with my 07 Denali.
Hey guys...Did anybody resolve this issue. I have a 07 Denali with the same issue. When I drive the vehicle for 20-30 minutes then it dies when I come to stop. It will take anywhere from 10-20 minutes until I'm able to start it again. No codes on the ODB reader and no lights on the dash..
I replaced the throttle body, battery, alternator, fuel pump relay (fuse). Still have the issue..Any help will be greatly appreciated.
I replaced the throttle body, battery, alternator, fuel pump relay (fuse). Still have the issue..Any help will be greatly appreciated.
kbuskill
***CAUTION*** I do my own stunts!
Wrap your fuel lines up near the engine and your fuel rail with a heat shielding wrap, like the foil backed fiberglass starter wrap, and see if that doesn't fix your problem.
The 6.2L runs pretty warm and causes the fuel in the fuel rail to vaporize which causes the stalling issue. Letting the engine cool down lets the fuel rail cool down and the fuel inside to return to a liquid state and the truck to run again.
All though I don't recommend doing this due to potential fire hazards with fuel on a hot engine.... There is a plastic cap on the fuel rail and under that cap is a fuel pressure test port that has a shrader valve like a tires valve stem, if you pressed this in while the truck is stalled, and released the vaporized fuel, it would probably start.
Keep us posted.
Thanx for the input kbuskill..Since my last post I replace the crank positioning sensor also..Today my wife took the car to go from VA to NC and the car died at the first gas station.
A few weeks back (before I replaced the crank sensor) I drove the car for 35 mile to an airtport and when I slowed down/stop to get the parking ticker before the gate the car died there. I checked the rail as suggested on another post and it sprayed gas all over the place. I did not see any bubbles or notice low fuel pressure (off course I'm not an expert and I did not have a pressure meter with me). I messed with the fuel rail when the car was actually dead and it wouldn't start. I sat there waiting for about twenty minutes and the car started again. I've read somewhere else about the vapor issue but I didn't do anything about it yet. I guess that will be my next fix if she makes it back home with the car (over 400 miles away now).
A few weeks back (before I replaced the crank sensor) I drove the car for 35 mile to an airtport and when I slowed down/stop to get the parking ticker before the gate the car died there. I checked the rail as suggested on another post and it sprayed gas all over the place. I did not see any bubbles or notice low fuel pressure (off course I'm not an expert and I did not have a pressure meter with me). I messed with the fuel rail when the car was actually dead and it wouldn't start. I sat there waiting for about twenty minutes and the car started again. I've read somewhere else about the vapor issue but I didn't do anything about it yet. I guess that will be my next fix if she makes it back home with the car (over 400 miles away now).
Anyone have any luck figuring out this issue? I just had a similar issue in our 08 Yukon XL Denali... after towing our camper for ~20 minutes in fairly hot weather, came to a stop light and the truck idled down to ~400-500 rpm... had to feather the gas to get it moving when the light turned green, and got a bit of a shift flare in 3rd I think.. ran ok on the hwy, started fine after we stopped for fuel an hour later, but died in the yard after almost coming to a complete stop... wouldn't start for 30 minutes, then fired up and runs fine.
Ok, I too have been chasing this for about a year. 07 Denali, 6.2, 150k miles. When towing our 30' RV (~7500 lbs.) in temps over 85-90 at highway speeds, stalls when you stop (unless I keep my foot on the gas, and keep it above ~1000 rpms). Starts and runs fine after ~30 minutes.
After reading countless internet post, I have tried:
cam sensor.
VVT magnet (the one outside the cover, not the actuator, although I bought one)
switched back to 5W-20. I was running 10W-40, but read this could be an issue.
After this, it acted exactly the same first trip at ~88 degrees after 45 minute tow. It does feel like vapor lock, I thought this the first time it happened.
Another post said this worked, so last week I wrapped the fuel rails with heat shield, and the line down past the firewall. Took it to the beach towing this weekend, stalled on the way home. 90+ degrees out, coolant was up past the 210 mark (at about 1:00) trans was at 212. No codes, never any codes. Popped the hood, hit the schrader valve on the rail, no vapor, just raw fuel for 10-20 seconds (I didn't have a gauge, but plenty of fuel there, the key was off so the pump was off). Still no start. Went to RV and got ice, PACKED the fuel rails in ice. Poured cool water as best I could down the back supply fuel line. No start. Sat for 45 minutes, tried starting it every 3-5 minutes. Finally started, got home (40 minutes without issue).
This is the most frustrating issue I have ever had, because it is hard to duplicate without a truck full of family, and something heavy in tow.
Any insight you folks have would be much appreciated!
I think next I will pull the throttle body off/apart.
I do not think the fuel pump is the issue, as some suggest, need more fuel to haul the RV at 70 than to idle at a light. This thing will pull the RV all day as fast as you want. Just don't stop at a light!
After reading countless internet post, I have tried:
cam sensor.
VVT magnet (the one outside the cover, not the actuator, although I bought one)
switched back to 5W-20. I was running 10W-40, but read this could be an issue.
After this, it acted exactly the same first trip at ~88 degrees after 45 minute tow. It does feel like vapor lock, I thought this the first time it happened.
Another post said this worked, so last week I wrapped the fuel rails with heat shield, and the line down past the firewall. Took it to the beach towing this weekend, stalled on the way home. 90+ degrees out, coolant was up past the 210 mark (at about 1:00) trans was at 212. No codes, never any codes. Popped the hood, hit the schrader valve on the rail, no vapor, just raw fuel for 10-20 seconds (I didn't have a gauge, but plenty of fuel there, the key was off so the pump was off). Still no start. Went to RV and got ice, PACKED the fuel rails in ice. Poured cool water as best I could down the back supply fuel line. No start. Sat for 45 minutes, tried starting it every 3-5 minutes. Finally started, got home (40 minutes without issue).
This is the most frustrating issue I have ever had, because it is hard to duplicate without a truck full of family, and something heavy in tow.
Any insight you folks have would be much appreciated!
I think next I will pull the throttle body off/apart.
I do not think the fuel pump is the issue, as some suggest, need more fuel to haul the RV at 70 than to idle at a light. This thing will pull the RV all day as fast as you want. Just don't stop at a light!
