04 L59

[79jasper]

Just trying a bounce a couple ideas.
Have a 04 suburban with the L59.
Got the knock sensor code for bank 2. Replace both with delphi and the harness.
Code came back a few weeks later.
I was reading that the upstream o2 sensor can bug out, causing the computer to throw the knock sensor code. I was thinking about swapping the upstream o2 sensors from side to side.
Only drive ability issue I've seen, if you floor it from a stop it bogs. Kinda like a old quadrajet 4 barrel carb. Hesitates until you are over 2k rpm or so.
I did replace the fuel pump, made it a fair amount better. But, I reckon I should double check fuel pressure, just in case.

Sent from my SM-N960U using Tapatalk

 

[Mudsport96]

Just trying a bounce a couple ideas.
Have a 04 suburban with the L59.
Got the knock sensor code for bank 2. Replace both with delphi and the harness.
Code came back a few weeks later.
I was reading that the upstream o2 sensor can bug out, causing the computer to throw the knock sensor code. I was thinking about swapping the upstream o2 sensors from side to side.

I havent heard that, but if its true that is an easier check than pulling the intake

Only drive ability issue I've seen, if you floor it from a stop it bogs. Kinda like a old quadrajet 4 barrel carb. Hesitates until you are over 2k rpm or so.
I did replace the fuel pump, made it a fair amount better. But, I reckon I should double check fuel pressure, just in case.

Sent from my SM-N960U using Tapatalk

My 06 does that too, smash the throttle and it takes off ok. But you can feel it pull after 2k. I think that's tq management keeping lowend power down to save the 60e.
And as for the quadrajet, that's a poorly adjusted choke pull-off and weak secondary flap spring. Easy fix there.
Edit could be a weak accelerator pump too they shrivel in the e10.

 

[79jasper]

To add clarification, if you ease up on the throttle, you can feel it pull harder.
Would that be torque management?

Sent from my SM-N960U using Tapatalk

 

[Scottydoggs]

knock sensors pull timing when they detect knock. so maybe they are freaking out and reporting kr and the pcm is pulling a lot of timing causing the bog and lack of power down low.

or the cats could be on their way out too if you got higher miles.

or you really need a tune up bad.

only thing i got on the knock sensors is, were they oem? did you tq em to 14 ?

 

[79jasper]

knock sensors pull timing when they detect knock. so maybe they are freaking out and reporting kr and the pcm is pulling a lot of timing causing the bog and lack of power down low.

or the cats could be on their way out too if you got higher miles.

or you really need a tune up bad.

only thing i got on the knock sensors is, were they oem? did you tq em to 14 ?

Cats are gutted. Did new plugs not long after getting it home. And yes, I think almost 219k now.
Sensors were delphi as10017. Didn't use a torque wrench, just snugged with a rachet.

Sent from my SM-N960U using Tapatalk

 

[Scottydoggs]

tq'ing them matters. ugga duggas wont cut it.

 

[79jasper]

Right, I didn't mean a impact. Just a 3/8 drive ratchet. Lol
This weekend, I may just pull them and swap the positions, ill put a torque wrench on them. I know there is a possibility of a failed new sensor.

Sent from my SM-N960U using Tapatalk

 

[Scottydoggs]

Right, I didn't mean a impact. Just a 3/8 drive ratchet. Lol
This weekend, I may just pull them and swap the positions, ill put a torque wrench on them. I know there is a possibility of a failed new sensor.

Sent from my SM-N960U using Tapatalk

im not implying you aped em in there at all. but 14 fp is like nothing. why it matters.

if you had them foam pieces under the intake toss them, and rtv the foam seals to the valley cover to keep water out of them.

 

[79jasper]

I believe I did toss the foam. I did seal the covers with rtv. So that will be fun to remove. Lol

Sent from my SM-N960U using Tapatalk

 

[Scottydoggs]

the rtv will come off, unless you used grey rtv lol that stuff holds damn well.