2008 Shelby GT - Misfiring

Zoso

Junior Member
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Feb 9, 2017
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Location
Brasstown, NC
My Shelby picked up a misfire on CYC 4 - Easy fix - New spark plug got me back on the road. Will change them all this winter. Strangely, the car only has 18,500 miles. I am using MSD red coil packs.

Motorcraft SP-547
Gap: .054; w/ Black Coil Boots; Spark plugs are torqued to the proper specification. Spark plugs- SP-546 and SP-547 require properly torqued to 30-38Nm (22 to 28 Ft. lbs.) with a dedicated 9/16 spark plug socket.
 

DieHarder

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Nov 9, 2019
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Get rid of those coil packs they’re garbage.


Sent from my iPhone using Tapatalk

Agreed, go with stock. I have a good/used set (Black coil boots from a 2006) if you want them that I'd let go for $20 +shipping. Ran perfectly when I pulled them. PM me if you're interested.
 

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