Dollar bill test

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Nov 20, 2025 | 09:52 AM

Coopaloop388

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4th Gear

Joined: Mar 2025

Posts: 4

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Dollar bill test

Hi all so I was roaming around online and came across the dollar bill, or 5 or paper to see if you have bad exhaust valves. So stupid me I tried it on my 08 C6 with 20,000 miles. It does suck in a little if I push the bill in closer. Is this true ? Now I am all worried. Thank you

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IMG_2732.mov (6.63 MB, 32 views)

Nov 20, 2025 | 11:01 AM

C5 Diag

Moderator, Tech Contributor

Joined: Sep 2013

Posts: 15,433

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From: Cape Coral, Florida

Not necessarily just a bad exhaust valve...any type of misfire can cause the dollar bill to get "sucked back" into the tailpipe when there is no combustion process...watch the video from about the 4:30 mark....better to use a factory level scan tool to see if you actually have a misfire.

Nov 20, 2025 | 03:53 PM

Spaceme1117

Safety Car

Joined: May 2016

Posts: 4,633

Likes: 1,818

From: Erlanger, Kentucky

There is nothing wrong with your car.

Drive and enjoy your car as stop worrying.

Nov 20, 2025 | 04:20 PM

Coopaloop388

Thread Starter

4th Gear

Joined: Mar 2025

Posts: 4

Likes: 1

Quote:

Originally Posted by Spaceme1117

There is nothing wrong with your car.

Drive and enjoy your car as stop worrying.

thank you

Nov 20, 2025 | 04:22 PM

Coopaloop388

Thread Starter

4th Gear

Joined: Mar 2025

Posts: 4

Likes: 1

Quote:

Originally Posted by C5 Diag

cool video, I don’t have a misfire. And I don’t think the bill is getting sucked in like the old school test . That would be like actually sucking it in the tail pipe ?! Plus with an X pipe not sure if it’s valid