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

[Scrappycrow]

It's possible an injector could be leaking causing the smoke on startup.

That's a possibility. I had that issue with an '86 BMW 535i, so until new injectors arrived, I'd shut off the engine by pulling the fuel pump fuse, which ensured there was no pressure while sitting.

 

[Grady_Wilson]

A fuel pressure gauge would tell you if the pressure was bleeding off faster than it should, along with pulling the plugs and checking for fuel.
But the plugs can be a pain on these things just to pull them to check them out.

 

[Rocket Man]

Changed the oil on the Tahoe I bought, sent the sample in to Blackstone. Hoping it’s good. Not sure of the mileage on the oil, monitor said 10% left. Found a few drips of pink stuff on the crossmember under the trans so I torqued the pan bolts. There were some that were pretty loose. Also built the wiring harness for the Pioneer. I went with a Crux interface since the Maestro has increased in price again. Hoping everything works as it should.

 

[Doubeleive]

Changed the oil on the Tahoe I bought, sent the sample in to Blackstone. Hoping it’s good. Not sure of the mileage on the oil, monitor said 10% left. Found a few drips of pink stuff on the crossmember under the trans so I torqued the pan bolts. There were some that were pretty loose. Also built the wiring harness for the Pioneer. I went with a Crux interface since the Maestro has increased in price again. Hoping everything works as it should.

you can usually find open box stuff on ebay for more reasonable prices