What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[Doubeleive]

Still smelling coolant!
Usually on cold mornings, start it up and when I open the door 5 seconds later, the smell seems to come from under the car.
No more smell after a few more seconds.

Heater hoses bypassed, new water pump & radiator..
I'm starting to think it's an external headgasket leak..?
Smell goes away quickly so I'm wondering if I'll even see any traces..

Pressure tester sounds like the best bet since I can check it cold.. (as was recommended many posts ago!)

Any other suggestions? Best way to look under the manifolds/back of head?
Drove about 200 miles yesterday, no coolant loss. Definitely smells of coolant most mornings though.

How long to do a headgasket?.. how about an AFM delete?

LOOK HARDER, use a flashlight
mark the coolant tank level when cold, some leaks are very slow might 2 weeks or more before you see the level go down, if level does not drop then your smelling something else.

 

[j91z28d1]

I'm pretty sure there's a coolent dye.


I honestly wouldn't worry about it till it gets worse.

 

[j91z28d1]

P2135 again

Service ABS Stabilitrac again

Can't keep up with this sht

I'm out of the loop. what happened

 

[avalonandl]

Drove the Denali XL north from Troy to Burt Lake. Avg about 80 mph and 17 mpg.

Have a replacement wheel from schram to replace the front left is leaking 15 psi a nite.

 

[George B]

Turned the ambient temp display for the control on with my Tech2.

 

[mikez71]

Thanks for all the info dub, doub, and j91!

1 day sounds damn good. I will try and find the leak definitively before i go any further. If i can't find the leak by tomorrow morning, I might buy the UV dye.. it was only $10 but $30 for the UV flashlight..

yep it must be a tiny tiny leak..

As much as I would love to do the AFM delete, 1 day and $30 of headgasket I dont mind putting it off.. But getting it done would feel nice...

 

[mikez71]

Turned the ambient temp display for the control on with my Tech2.

Where is it displayed? mirror?

 

[George B]

Where is it displayed? mirror?

On the front hvac control

 

[Geotrash]

Still smelling coolant!
Usually on cold mornings, start it up and when I open the door 5 seconds later, the smell seems to come from under the car.
No more smell after a few more seconds.

Heater hoses bypassed, new water pump & radiator..
I'm starting to think it's an external headgasket leak..?
Smell goes away quickly so I'm wondering if I'll even see any traces..

Pressure tester sounds like the best bet since I can check it cold.. (as was recommended many posts ago!)

Any other suggestions? Best way to look under the manifolds/back of head?
Drove about 200 miles yesterday, no coolant loss. Definitely smells of coolant most mornings though.

How long to do a headgasket?.. how about an AFM delete?

I would check those coolant tees at the firewall. If those things are dripping at all when the engine is cold, you will smell it in the cabin.

 

[89Suburban]

I'm out of the loop. what happened

I installed drop spindles and during the process on the first side I must have been too rough and the wheel sensor must of got damaged. So I had to pull that side back apart again to install a new one and all was fine. I did the other side this weekend and was SUPER gentle with that sensor. But it still threw the code again. So I was super pissed off. I got another new one and installed that today. Ok in the driveway so far, test drive later will confirm. So super aggravating to have to dig back into both sides again after all the spindle work.

Then Saturday night it went into limp mode and got stranded 20 miles from home 10 oclok at night. I plugged my scanner in and got the P2135 code. This happened a few months ago one night too. I scanned and got that code and messed with the the plug on the throttle body and gave a couple of good slams to the throttle pedal and it went away. Until it happened again this night. Same code, did the same hail mary techniques. Fired up fine. When I went back under the hood as soon as I touched the harness plug it shut off. Gave it another "wishful wiggle" and started and ran fine. Drove home fine.

Just to clarify it only showed that one code during the initial stranding Saturday night. And I did not clear it.

Today after installing the new speed sensor I pulled the intake snorkel off to remove and check the TB sensor plug and wiring. I can not find anything wrong that stands out. I used compressed air to blow out the connection and plugged it back in tightly. The throttle body assembly was replaced around 40K miles ago with a Pep Boys unit.

When I fired it up after checking that plug all seemed fine on the dash board. I ran the scanner to clear the code and now found I have 3:

P1516
P2101
P2135

I cleared them all and will test drive tonight. Didn't look up the other codes yet because I am getting my ass kicked by this truck and everyone else and their fkng problems. So that is where I am at right now.

I have an appointment Tuesday to get this heap aligned and tires rotated and speed balanced. I told them I want before and after alignment readings so I can share here for your viewing pleasure. I took all my PPV center caps, bolts and spacers off so they don't f them up or loose them.