Dual spark??
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
THey had an issue with the 4cyl not wanting to start efter they converted it to EFI. They went into the computer and did some work. It turned out to be a timing issue while cranking. The only way they were able to resolve it was to add the second set of spark plugs. When you crank it to start the one set fires either very retarded or advance (I forget which at this point), and once it's running the other set takes over to "run" the engine.
Posting Guru
Joined: Jul 2003
Posts: 1,978
Likes: 1
From: Alvin, Texas.
I believe I have Motorcraft double platinums in my truck right now. I think that, but I haven't gotten to even 50K miles since they've been in and my stealership friend who sold me the truck did the tuneup before I bought it.
Last edited by AlfredB1979; Aug 20, 2005 at 01:08 AM.
Post Fiend
Joined: Jan 2000
Posts: 5,330
Likes: 17
From: Dryden, ON, Canada
That's very untrue. There are lots of EFI single plug engines out there. Any 4 Banger Mustang for example(including turboed units.) Dual plugs promote a more complete burn of the fuel in the combustion chamber with that chamber design, therefore cleaning up emissions, and increasing power output. Don't believe me? Unplug one of the coilpacks, doesn't matter which one, and the engine will still start and run without issue, it's been a looooong time since I fooled around with dad's 96, but, it would run seemingly fine on one set of plugs, but MPG and power would be down by a bit(If I drove it now, even with all 8 plugs, it'd probably still be totally gutless to me... LOL)
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Logistics Pro
Joined: Jan 2002
Posts: 4,907
Likes: 39
From: suburban atlanta
My single plug injected 2.3 has been starting fine for 20 years. Doan think it is a timing issue, as the ECM can fiddle with the timing all day long w/o needing another set of coils, wires, and plugs.
They are so penny pinching that they will not throw an extra nut or bolt on because one extra can be $millions... Why would they throw two ignition systems on unless they HAD to.
tom
They are so penny pinching that they will not throw an extra nut or bolt on because one extra can be $millions... Why would they throw two ignition systems on unless they HAD to.
tom
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Hotshot
Joined: May 2004
Posts: 12,170
Likes: 5
From: The hills of No. Calif.
I can't speak on this with any authority (not that I'm gonna let that stop me) but what I heard was that dual plug engines located the plugs in different positions in the combustion chamber and used slightly different timing for intake-side plugs vs. exhaust-side plugs to try to ignite the mixture better for a more complete burn, thus reducing emissions.
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