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

[cmatt]

View attachment 265015

What’s that fitting you’ve got on the PCV valve?


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[George B]

Seemed to behave better on the way home. Maybe I can do some tests with my Tech2. Gonna look for a date code and maybe have it load tested. If it fails or is questionable I will replace it.

Poking around with the tech2 but didn't come across any charging system stuff. It seems to be running just above 14v now so I will keep an eye on it.

 

[George B]

I also note my LTFT was at -10 and -8 but I filled from 1/4 tank with 91 non-ethanol on sunday. Could that cause the trims to go negative like that? I don’t think it’s anything to worry about.

 

[kbuskill]

usually (not always) when the battery gets weak you start seeing the voltmeter move around more, with a fresh healthy battery it should stick closer to 14. just my experience with both the nbs and nnbs. I think @kbuskill or somebody just put a new battery? you see any difference in the meter movement

I recently replaced my Optima Red Top with another Red Top due to it starting slowly and it only had 208 CA out of the 1000 CA it was supposed to have.

My volt meter bounces around, just as it was designed to do, no big deal.

The cold weather actually causes the alternator to put out more voltage. A cold battery will take more power than a hot battery.

 

[kbuskill]

I also note my LTFT was at -10 and -8 but I filled from 1/4 tank with 91 non-ethanol on sunday. Could that cause the trims to go negative like that? I don’t think it’s anything to worry about.

Probably, again, due to the cold weather.

The negative fuel trims indicate that you are running a little rich, which is expected with cold air. Colder air is more dense and therefore has more oxygen content than hot air so the extra oxygen requires more fuel to compensate for it.

Also the non-ethanol fuel requires less fuel to be injected than ethanol fuel so your computer is leaning out the mixture.

 

[George B]

Probably, again, due to the cold weather.

The negative fuel trims indicate that you are running a little rich, which is expected with cold air. Colder air is more dense and therefore has more oxygen content than hot air so the extra oxygen requires more fuel to compensate for it.

Also the non-ethanol fuel requires less fuel to be injected than ethanol fuel so your computer is leaning out the mixture.

I agree and what I was thinking. It was cold this morning (about 16F) and the high was only 26 which is a drop from the mid 40s three days ago. That plus the switch from 50% ethanol to probably less than 10% is probably causing it to trim.

 

[gat0r]

Alright...time to ask...what does “PIA” mean?

more commonly PIA is actually PITA (Pain In The A**)
@ least everywhere i've been.

 

[Doubeleive]

more commonly PIA is actually PITA (Pain In The A**)
@ least everywhere i've been.

"the" is silent lol

 

[gat0r]

so its more like Kansas vs Arkansas

people just making stuff up LOL

 

[George B]

so its more like Kansas vs Arkansas

people just making stuff up LOL

Technically we bluff and make stuff up for most of our lives.