View single post by sheltonfilms

Posted: Wed Jan 17th, 2018 12:03 am

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sheltonfilms
Electronicals / Forscan Expert

Joined: Fri Nov 24th, 2017

Location: Hoover, Alabama USA

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What I was getting at is this Ranger has both waste and dual spark plugs firing. Contrary to popular belief both spark plugs in a cylinder fire at the same time (1 from each coil pack) as well as the cylinders complement cylinder (1 and 4, 2 and 3) as waste spark.

So at any given time there are four sparks happening (2 sparks in cylinder 1 during compression, and 2 in cylinder 4 during exhaust as waste).

Remove any coil pack and you still have a waste spark system, just spark plugs are firing on one side.

The only time this doesn't happen is during startup, where only the exhaust side fires until normal engine speed is met.

So if a wire is bad, a spark plug is bad, or even a coil, these engines should in theory still run fine.

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2000 XLT 2.5L A/T 2WD
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Explorer Sportrac White Face Cluster
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