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Stock exhaust flapper

mkolenski

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mkolenski Enthusiast

mkolenski

Posted
Posted

I have a 2018 silverado with the 6.2L. I know in my previous Chevy Camaro had the flapper valves in the exhaust, and you could pull a fuse to allow them to default to the open position all times.

 

I know there is a flapper valve in the exhaust of my 2018 silverado, My question is, does the 2018 silverado have a fuse?

 

Sent from my SM-G955W using Tapatalk

 

 

Dnt Senior Enthusiast

Dnt

Posted
Posted

No electric cutouts on the trucks the flapper is a simple spring loaded device 

goeb34 Enthusiast

goeb34

Posted
Posted

I’d play it safe and cut it out and the mufflers so you can really hear it, just add a y pipe

Bikemobile Enthusiast

Bikemobile

Posted
Posted

I pinned mine open all the time with a drywall screw in the corner of the external square spring part of the flapper.

 

A few Christmas’s ago my father in laws 2014 sierra would not start in the morning. It was -10 out. The flapper valve had frozen shut from condensation. A few hammer blows fixed it. After that, my flapper is always open. I dont hear any difference in exhaust sound ever. 

mjm-1957 Enthusiast

mjm-1957

Posted
Posted

That valve is there to provide back pressure when in 4 cylinder mode. The valve is normally closed by spring pressure. Doubt highly if it would cause a nostart.The o2 sensors require some exhaust stream back pressure  to accurately monitor the fuel trims. Thats why its there in the first place.

Bikemobile Enthusiast

Bikemobile

Posted
Posted
26 minutes ago, mjm-1957 said:

That valve is there to provide back pressure when in 4 cylinder mode. The valve is normally closed by spring pressure. Doubt highly if it would cause a nostart.The o2 sensors require some exhaust stream back pressure  to accurately monitor the fuel trims. Thats why its there in the first place.

I highly doubt you were there to see the truck start after hitting the pipe with a hammer. See link. 

 

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