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

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

pwtr02ss

Full Access Member
Joined
Apr 1, 2013
Posts
10,211
Reaction score
20,520
Location
Tennessee
I got four new ACDelco O2 sensors from RA a while back. They came in Delco packaging but no extra padding inside. The sensor ends all had anti seize, all four rattled around big time inside their box. Two were Hencho en Mexico, two unmarked to their origin.
Mine were the same way. Marked "denso". I ordered from RA as "GM Original Equipment". I was surprised when they came as repackaged Denso
 

FrankU

Full Access Member
Joined
Nov 21, 2013
Posts
705
Reaction score
844
Location
Babylon New York
I think the timing is adjusted to give it more top end, but that's just a guess, since I installed the tune on both the silverado and the yukon I sometimes get a little ping out the gate depends on how long it has sat idling or not, I need to send a file back for both trucks. both have a sport tune.
Most likely they have the knock sensor riding the spark advance tables. That means the spark will advance till the knock sensor senses knock then it will back off the advance a hair till no knock is detected.

Hope that makes sense. I do have a problem with my writing skills.
 

wsteele

Full Access Member
Joined
Dec 26, 2020
Posts
1,731
Reaction score
2,346
Mine were the same way. Marked "denso". I ordered from RA as "GM Original Equipment". I was surprised when they came as repackaged Denso
I had read somewhere that Denso supplied GM with O2 sensors, among other electronics. I suspect GM sources their O2 sensors from a number different vendors. I know the four sensors I got came from two different places of origin.

I would bet all the money in my pocket that the quality of the two ("ACDelco" and "Denso") are identical.
 

Bill 1960

Testing the Limits
Joined
Dec 17, 2020
Posts
1,480
Reaction score
2,857
What is this wideband gizmo that several of y’all are talking about?
It has a wider response range than the factory oxygen sensors and tuners use it to measure and correct the air-fuel ratio when they’ve made modifications to increase one or the other.

Be careful because if you speak it’s name you have to buy one.
 

pwtr02ss

Full Access Member
Joined
Apr 1, 2013
Posts
10,211
Reaction score
20,520
Location
Tennessee
I had read somewhere that Denso supplied GM with O2 sensors, among other electronics. I suspect GM sources their O2 sensors from a number different vendors. I know the four sensors I got came from two different places of origin.

I would bet all the money in my pocket that the quality of the two ("ACDelco" and "Denso") are identical.
For sure. I was like "Damn, I could've saved myself the $2 and just got the Denso"..lol
 

Sparksalot

Supporting Member
Joined
Sep 20, 2020
Posts
5,061
Reaction score
13,729
Location
Bastrop County, Texas
It has a wider response range than the factory oxygen sensors and tuners use it to measure and correct the air-fuel ratio when they’ve made modifications to increase one or the other.

Be careful because if you speak it’s name you have to buy one.
I’m still debating a CAI tube to get rid of the intake resonance chambers. I’m not sold.
 

Forum statistics

Threads
128,790
Posts
1,805,493
Members
91,772
Latest member
dvnt
Top