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Intake clean. WOW!

bdbake01

By bdbake01
in Engines & Drivetrain

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clayp Enthusiast

clayp

Posted
Posted

I've been running a tank of E85 once every 5 fillups or so to try to dissolve any deposits. Has anyone who has used E85 often had an issue with these deposits?

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bdbake01
bdbake01

yep, gotta admit the scraper is genius. Probably more reliable than the wife. DEFINITELY less mouthy about the situation.

nadrojcote
nadrojcote

I just did my truck with seafoam. I can't tell a huge difference yet, but we will see over time. Used my window scraper to keep the rpm around 2000.  

bdbake01
bdbake01

Ok, so lately I've been noticing the 6.2 stumbling a bit, hesitating, lower mileage - even more than expected for winter - etc. and began getting more concerned about intake valve buildup. 26k miles

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Nanotech Environmental Enthusiast

Nanotech Environmental

Posted
Posted (edited)
17 hours ago, clayp said:

I've been running a tank of E85 once every 5 fillups or so to try to dissolve any deposits. Has anyone who has used E85 often had an issue with these deposits?

Actually, doing that won't have any effect on this issue. Basically the issue is deposits on the stem and back of the intake valves. This is caused by the fact that the intake vales run a bit hotter now, as they don't have fuel vapors and mist cooling & cleaning them off like on old school carbed, TBI and port injected engines, and there is oil vapors coming in the intake from the PCV. When these oil vapors hit the intake valves, they coke and form deposits. Deposits can also form around the intake port beside the valve seat as well. The deposits gradually build up until it starts causing issues with power, fuel mileage & driveability.

Since none of your fuel is getting to the stem of the intake valve, it doesn't make any difference which fuel you run.........

Edited by Nanotech Environmental
clayp Enthusiast

clayp

Posted
Posted
18 hours ago, Nanotech Environmental said:

Actually, doing that won't have any effect on this issue. Basically the issue is deposits on the stem and back of the intake valves. This is caused by the fact that the intake vales run a bit hotter now, as they don't have fuel vapors and mist cooling & cleaning them off like on old school carbed, TBI and port injected engines, and there is oil vapors coming in the intake from the PCV. When these oil vapors hit the intake valves, they coke and form deposits. Deposits can also form around the intake port beside the valve seat as well. The deposits gradually build up until it starts causing issues with power, fuel mileage & driveability.

Since none of your fuel is getting to the stem of the intake valve, it doesn't make any difference which fuel you run.........

great explanation thanks

  • 5 years later...
ByronSing95 New Member

ByronSing95

Posted
Posted

Hello guys , anyone still here to help. I have a 2016 gmc sierra with 5.3 in it, i have changed injectors, maf sensor, O2 sensors , spark plugs , but still P219B keeps coming back. Wondering if a good cleaning of the chamber and intake would be my issue. Any thoughts ? Truck has 125,000 on it

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