Intake carbon buildup

[lpg]

While I have the newer gen 6.2 I am wondering how the older 6.2 are doing in terms of intake valves after some miles. Occasionally have a rougher idle but haven’t taken manifold off and looked inside.

 

any buildup on these motors ?

[M1ck3y]

If you have an l87 you will have 0 issues with carbon buildup.

[CamGTP]

The 5.3's are and 6.2's are the same design, so doesn't matter too much who comments here.

 

I made a thread about mine at 104k miles, they looked fine. I don't run a catch can or anything either.

[lpg]

Awesome that’s the reply I was looking for, actual long term perspective. Thanks for reply 

[silveradosid]

i am at 140k, no catch can. i do oil changes when olm is at 35 percent, truck still runs a good as the day i got it

[diyer2]

Average miles at 35%?

[Grumpy Bear]

1 hour ago, diyer2 said:

Average miles at 35%?

 

I'll guess 5,000. Same place mine is. Let's see what he says. I like conformation.  

[Grumpy Bear]

12 hours ago, CamGTP said:

The 5.3's are and 6.2's are the same design, so doesn't matter too much who comments here.

 

I made a thread about mine at 104k miles, they looked fine. I don't run a catch can or anything either.

 

I saved it on my desktop it is that impressive. 

Cam's motor below.

 

[Robby James]

Good info as I am on the edge of catch can or not, this helps but does anyone/everyone have a slighty rough idle at stop lights occasionally?

I thought that the catch can gurus are saying the device will cure this issue?

Oh yeah 2020 with a 6.2 liter

Thanks

Edited September 27, 2021 by Robby James
More info

[Grumpy Bear]

22 minutes ago, Robby James said:

Good info as I am on the edge of catch can or not, this helps but does anyone/everyone have a slighty rough idle at stop lights occasionally?

I thought that the catch can gurus are saying the device will cure this issue?

Oh yeah 2020 with a 6.2 liter

Thanks

 

That is caused by a ridiculously low idle speed. Tune it. Even 50 rpm helps. 

[diyer2]

Robby,

Rough idle, I would use a fuel system cleaner regularly. How often is your decision.  One with PEA. Like Gumout. Only Top Tier gas. 

Catch can also a personnel decision. I run one on my 12. Why not?

[lpg]

I’ll prob just pop off the manifold around 50k and look inside. Think 50k is spark plug time anyways? 

[lpg]

22 hours ago, M1ck3y said:

If you have an l87 you will have 0 issues with carbon buildup.

How do you figure out the l87 thing?

[M1ck3y]

L87 doesn't have a pcv valve coming from the valley (l86 does). Crank case pressure exits solely through the drivers side valve cover which does a damn good job of stoping liquid from entering the intake tract. 

 

Edited September 28, 2021 by M1ck3y

[Robby James]

10 hours ago, Grumpy Bear said:

 

That is caused by a ridiculously low idle speed. Tune it. Even 50 rpm helps. 

Isn't it not tuneable until I drop the 4k to get ecu swap?