Ford Duraspark II system
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Freshman User
Joined: Mar 2012
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Ford Duraspark II system
Hi guys, I have seen a lot of posts from people saying they converted their 86 f-150s to the Duraspark II system. I thought ALL 86 Fords were DSII systems. I have a 86 F-150 with the 5.8 HO that is DSII with the blue pin on the module mounted on the driver side fender. Were the 302 efi engines a different type of ignition? Curious minds need to know! Bud in AZ
Laughing Gas
Joined: Aug 2010
Posts: 983
Likes: 49
From: Northern Kentucky
As I understand, 351 H.O. and 460 were still Duraspark in 1986, other 351s were computer controlled carb and Thin Film Integrated ignition in '86 and I believe the 302 was EFI/TFI by then. Others may have more exact info.
Moderator
Joined: Jan 2001
Posts: 56,984
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From: Virginia
The popular swap you probably keep running into is a truck with the 300 six. There were several years there before they went to fuel injection, that this engine had a computer controlled carb and ignition system.
When it works, it works great. But when you buy these old trucks you will usually find the "get rid of emissions" bandits have taken most everything off, not realizing that they have done a serious labotomy, and the truck's engine will not run correctly. It's very similiar in function to a fuel injected engine, and just think about taking half the stuff off a fuel injected auto and see how it runs.
So most people in this situation convert the engine backwards to the older 300 setup, which did use the duraspark II and a different carb.
When it works, it works great. But when you buy these old trucks you will usually find the "get rid of emissions" bandits have taken most everything off, not realizing that they have done a serious labotomy, and the truck's engine will not run correctly. It's very similiar in function to a fuel injected engine, and just think about taking half the stuff off a fuel injected auto and see how it runs.
So most people in this situation convert the engine backwards to the older 300 setup, which did use the duraspark II and a different carb.
Cargo Master
Joined: Apr 2010
Posts: 2,936
Likes: 9
From: Acworth, GA
If you want to know more about the TFI IV ignition system, I have some info on it here; Ford Truck Enthusiasts Forums - Grubbworm's Album: Troubleshooting help, for anyone that needs it.
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