you could see if the ambient temp reading is relatively close to actual and map sensor is reading correctly, just a couple things that are easy to check without going down a rabbit hole.
What did you do to your NNBS GMT900 Tahoe/Yukon Today?
- Thread starter phattyford
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I think I am going to wait until I replace the trans to get a tune.
been waiting on this stupid control arm to ship from amazon for a month now, because it was $10 less than rockauto.....
canceled and ordered it this morning from rockauto and it shipped already..... tired of waiting... got a road trip in a couple weeks and need to get this front end done
canceled and ordered it this morning from rockauto and it shipped already..... tired of waiting... got a road trip in a couple weeks and need to get this front end done
Tonyrodz
Resident Resident
Wise choice. How many miles on your trans?
Plus I wanna make sure all the bugs are worked like like the one I am dealing with now. I was wondering maybe if there is an injector that got something stuck in it from the R&R process.
When I went to lunch today it was worst cold start yet, cranking 1rst time no fire. Crank 2 very long gave it some pedal fired up a few seconds afterwards big cloud of black smoke. Cleared right up and ran fine.
Shit's fkn with my OCD. Going to double check some simple things like the PCV hose air box to the right side VC. Too cold to fk around with it right now. It is starting to irk me I don't want to be gas washing the oil off the cylinders on cold starts with a new motor. Puzzling no codes or engine light.
No clue other than I know it's been rebuilt once. So 360K / 2 = 181K to keep it simple.
When I went to lunch today it was worst cold start yet, cranking 1rst time no fire. Crank 2 very long gave it some pedal fired up a few seconds afterwards big cloud of black smoke. Cleared right up and ran fine.
Shit's fkn with my OCD. Going to double check some simple things like the PCV hose air box to the right side VC. Too cold to fk around with it right now. It is starting to irk me I don't want to be gas washing the oil off the cylinders on cold starts with a new motor. Puzzling no codes or engine light.
Tonyrodz
Resident Resident
Are they the old injectors, or a new set? Does it idle rough once it starts--like it's misfiring?
Look at fuel trims. Could be something as simple as the purge valve on the engine staying open when it shouldn't, letting fuel vapors into the intake (flood condition). Otherwise maybe sticky injector.
Next time it cranks but doesn't start, floor the accelerator and use clear flood mode, see if it starts then.
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They are original. Once it fires up and clears out it's perfectly fine.
I have no scanner to read those.
I remember the shop that put the motor in telling me a hose on the purge valve broke during R&R and had to be replaced. Maybe some debris got in there? I will look at it over the weekend. Make sure everything is connected properly and such.
I will try that clear mode next time. Thanks big F / Sammy.
Tonyrodz
Resident Resident
It's possible an injector could be leaking causing the smoke on startup.
