chessman21
Well-Known Member
- Joined
- Jan 7, 2016
- Messages
- 75
- Vehicle Year
- 1969 f-600hd
- Transmission
- Automatic
What kind of spark plug would be best for my 1991 4.0?
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spark plug type recommendation
- Thread starter chessman21
- Start date
adsm08
Senior Master Grease Monkey
Supporting Member
Article Contributor
Ford Technician
TRS 20th Anniversary
- Joined
- Sep 20, 2009
- Messages
- 34,623
- City
- Dillsburg PA
- Vehicle Year
- 1987
- Engine
- 4.0 V6
- Transmission
- Manual
- Tire Size
- 31X10.50X15
Motorcraft.
Yes +1, Autolite is next best
And only regular copper or Double Platinum, skip Single Platinum because of the Waste spark system, one bank will wear out just like regular copper if you use single platinum
And only regular copper or Double Platinum, skip Single Platinum because of the Waste spark system, one bank will wear out just like regular copper if you use single platinum
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