Spark Plug Question
Thread Starter
Melting Slicks
Joined: Jul 2007
Posts: 2,939
Likes: 7
From: Simpsonville SC
St. Jude Donor '09-'10
Spark Plug Question
I just pulled a spark plug, from cylinder 4. It has abotu 6000 miles on it. It is a TR6 plug gapped at .035. Is this a normal look? My engine is supercharged.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
You need to be a lot closer to 12.5 13.0 at WOT. You need a good tune. 
Thats what your seeing.
Do some dynamic engine data logging and see where your Long Term Fuel Trims are. I bet ya there way positive. They need to be slightly negitave.
BC
Thats what your seeing. Do some dynamic engine data logging and see where your Long Term Fuel Trims are. I bet ya there way positive. They need to be slightly negitave.
BC
Former Vendor
Joined: Dec 2009
Posts: 3,353
Likes: 166
From: 19804
His car is supercharged. He doesn't want to be high 12s under boost.
