What did you do to your NBS GMT800 Tahoe/Yukon Today?

[TEXCHEVY]

How bout this one?

I think to place them on the sides of the engine, the idea is that, I will post the photos when I run the experiment

 

[Logan5]

Evap code is back. Recently did the vent & purge valves so today was playing detective to find the leak. Pulled the vent valve hose and stuck a cork in there to seal it up. Pulled the purge valve hose and blew air in. Can feel the leak. Hooked up a low pressure feed from air compressor to the purge valve hose and started listening for a hiss. The hiss and some clicks definitely coming from the top of the gas tank. SOB. Guess I have to drop the tank now. Just filled it up yesterday.

 

[Tonyrodz]

Or, less likely, the engine coolant temp sensor is mis-reporting to the PCM.

Even if the stat was stuck open, wouldn't the entire system reach normal operating temp at some point? Unless it was like 0 degrees (or below) outside, wouldn't it get there eventually after running for a while (even with a stat stuck open)?
While unlikely, as you say, I would still be willing to think the sensor sending suspect data to the ECM is still possible.

The heat comes out ok from the vents. What's a good way to tell which one is the issue? Thermostat or the temp sensor?

 

[Fless]

A scanner should have the PIDs to show the Intake Air Temp (IAT) and the ECT in live data; you could compare them cold, then as it warms up a bit to see if they track.

 

[Scottydoggs]

The heat comes out ok from the vents. What's a good way to tell which one is the issue? Thermostat or the temp sensor?

touch both heater core hoses. if they are hot hot like normal the sensor died, its a two part sensor, one 1/2 sends info to the pcm, the other to the cluster. if cold/luke warm the t stat is likely open.

 

[hertahoe]

Replaced output seal in transfer case, changed front/rear diff fluid (Lucas 75/90). Will change tranny fluid next week...

 

[iamdub]

I was actually considering the hood also but mixed emotions about it in my household

I wouldn't do it in flat black cuz it'll look like you were in a wreck and never painted the replacement hood.

 

[MassHoe04]

The heat comes out ok from the vents. What's a good way to tell which one is the issue? Thermostat or the temp sensor?

You are going to be well above freezing today in NJ. Like 50+... I can't see how the system could be at 160-165 with a stat stuck closed or open.

If you still read that low, I would be shocked to hear it was a bad stat and not the sensor (or wiring/connectors). Maybe it is not always a high probability in a lot of reported issues, I think @Fless original hunch might be onto something. Keep us posted.

 

[Walchit]

Machine shop called. Heads pressure tested good, cam bearing hole isn't wallered out, and magnaflux showed zero cracks. Now to decide if I should just slap these pistons in or go to flat top, or 5.7. I'm gonna ask for some prices when I pick the block up, that should push me towards re-using the stock ones, lol
That premium gas price has me re-thinking the higher compression ratio for sure.

 

[TEXCHEVY]

How bout this one?

I mounted the sensors, spartan work!!! ) (the kit has not yet arrived), I traveled about 100 km, at the moment no error code in diagnosis. Engine light off. The engine runs well on gasoline and also lpg