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

[Doubeleive]

Replaced the MAF, MAP, Knock Sensor x2, removed tune and placed stock airbox back on to try and diagnose this madness my Yukon decided to do. When accelerating from a stop or under a load, falls flat on its face, bogs down and can here it popping through the intake. Idles absolutely fine, just only under acceleration. Only codes on my GM Tech 2 scanner is P0328 for a Knock Sensor Circuit High Voltage Bank 1. Replaced both knock sensors, cleared code and comes right back up.

I am lost on what it could be, my dad thinks I got a bad batch of fuel. I went through 1/4 tank with no problems then just hit out of no where.

have you taken any fuel pressure readings?

 

[HiHoeSilver]

have you taken any fuel pressure readings?

My first thought, too, Wes.

 

[avalonandl]

Air compressor from yesterday....

 

[gooffeyguy]

Damn, did the previous owner keep the damn thing parked in a lake?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

 

[HiHoeSilver]

Damn, did the previous owner keep the damn thing parked in a lake?

2001 Yukon SLT
2012 Yukon Denali XL
2011 Yukon Denali RIP 5/20/18

A lake called Michigan, I'm guessing.

 

[Rocket Man]

welcome to my ignore list

Fu@k yeah! Do you like how I overused the emojis on that post in an attempt to show you how your posts look? Lmao.

 

[Rocket Man]

Air compressor from yesterday....View attachment 228857

A
Ahhh the good ol rust belt.

 

[avalonandl]

Clearly this thing lived on a dirt road for most of its life. It was the one thing that ALMOST kept me from buying it. But the vehicle was very clean otherwise. As earlier in this thread I looked like Buckwheat from lil rascals when I was done....

 

[avalonandl]

the tech2 will do all kinds of stuff, you can get all the part numbers of the modules that are hard to get to, you can test all the channels on your bose amp, lots of fun stuff, lol

I just opened my box for the tech2 and cannot believe the number of cables connectors etc.....

OMG this is confusing. Also my laptop does NOT have a built in cd drive.

1. Is the Tech2 preloaded? seems to be
2. Just connect it to OBD port and turn to run?
3. Don't want to blow my ECM

As an aside its Bosch software (Chinese Copy i'm sure not authorized)

Turned it on when plugged into the wall. Menu works.

 

[Rocket Man]

Replaced the MAF, MAP, Knock Sensor x2, removed tune and placed stock airbox back on to try and diagnose this madness my Yukon decided to do. When accelerating from a stop or under a load, falls flat on its face, bogs down and can here it popping through the intake. Idles absolutely fine, just only under acceleration. Only codes on my GM Tech 2 scanner is P0328 for a Knock Sensor Circuit High Voltage Bank 1. Replaced both knock sensors, cleared code and comes right back up.

I am lost on what it could be, my dad thinks I got a bad batch of fuel. I went through 1/4 tank with no problems then just hit out of no where.

Clogged cats is my guess. Mine did pretty much that when it happened to me. I was getting codes for random misfires, MAF codes, etc and it would drive fine as long as I barely pushed on the throttle but as soon as I tried to push it a little bit it would cough and buck and go into reduced power mode. Seems if it can’t get the air/exhaust out through the tailpipe it messes with what the computer sees coming in. I never had an O2 code.