Help reading spark plugs
Thread Starter
Joined: Jan 2002
Posts: 4,069
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From: Casselberry FL
Help reading spark plugs Replacing my 12+ year old GMPP ignition wires with Firecore50's, installing DEI titanium boots, and replacing the 5 year old TR6's with another set of TR6's. I believe the old TR6's were gapped at 35, I set these to ~45. SCR 10.8, DCR 8.5, quench should be about .040, I'm not aware if it was checked when built.
Before I take on the passenger side, I wanted to see if the driver side plugs reveal anything to be concerned about. Does the brown discoloration on the end of the strap mean it's too cold, or is it far enough away from the strap tip to be considered normal?
From left to right, plugs from cylinders 1,3,5,7
Edit: And the passenger side, plugs from cylinders 2,4,6,8
Before I take on the passenger side, I wanted to see if the driver side plugs reveal anything to be concerned about. Does the brown discoloration on the end of the strap mean it's too cold, or is it far enough away from the strap tip to be considered normal?
From left to right, plugs from cylinders 1,3,5,7
Edit: And the passenger side, plugs from cylinders 2,4,6,8
Last edited by JimMueller; Jun 7, 2015 at 11:39 AM.
