6.2l engine tick

PG01 said:

Thats the direct injection, sounds like a ticking time bomb

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KMeloney said:

Which? The '09's? Or the Yukon's?

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Azjake said:

Do all 6.2 L engines tick on start up until it’s warm. My dealer said it was normal it has 10,000 miles. I’ve done two oil changes. I do about every 5000 miles. 2023 Yukon Denali.

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KMeloney said:

While we're talking about engine noises from these trucks... What's the "jingle" I hear at low-speed deceleration? Sounds like it might be more from under the truck as opposed to the engine. Sounds almost like it would be associated with an exhaust valve fluttering (which probably doesn't even exist, but is how/when I picture the noise occurring)...

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homesick said:

IDK about these trucks, specifically, but I've seen loose heat shields, for catalytic converters, sound like that.

joe

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KMeloney said:

I've got to believe the noise I hear is exactly what Djnice described just above.

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homesick said:

OK.

Are you guys talking about a valve in the exhaust pipe? If so, why would it exist? What's its purpose?

joe

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Sean Michael said:

There is a passive valve, basically a spring loaded flapper, in the exhaust that opens and closes as the exhaust flow increases and decreases. It's primary if not sole purpose is that it closes, at least partially, when DFM kicks in while cruising and these engines are using less than all 8 cylinders. It does that to reduce the odd sound the exhaust makes when running on less than 8 cylinders. Some people who have removed it, like when switching out for louder aftermarket exhaust, say it sounds like a helicopter when DFM kicks in. The flapper wouldn't be necessary if the engine always ran on all 8 cylinders. Some people who remove the flapper and install louder exhaust rectify this by also installing a Range device that keeps the truck from activating DFM.

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