4.2 double firing?

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Jun 18, 2007 | 08:48 PM

#1

Xyzzy

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Joined: Nov 2003

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From: Wynne, Arkansas

4.2 double firing?

I read that the 4.2L fires 2 cylinders at the same time, except one of the 2 cylinders is in the "empty" phase of the 4 stroke cycle. Why do they do that? I'm just curious.

Links and knowledge are appreciated!

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Jul 9, 2007 | 06:47 PM

#2

amish77

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Joined: Oct 2004

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From: Seneca, SC

I'm guessing it's for emissions purposes. Firing the extra time will burn any leftover flammables in the exhaust before it exits.

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Jul 10, 2007 | 06:54 AM

#3

projectSHO89

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Joined: Jan 2004

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From: St Louis

Nope.

It's called a "Waste Spark System". Google that.

It simply less expensive to manufacture and produce.

Steve

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