Had a good look at my spark plugs today, both sides of the V. Followed Dave Ws advice on chocking up one side of the intake manifold, but needed to detach the throttle body and accelerator linkage. The plug tips on the "awkward side" where in really good condition. As we're the "easy side", but all 3 had browny orange burn marks on the ceramic, managed to scrape some off so not sure it could be rust, or some other burnt residue. I've got some plugs coming, but any idea what could have caused the discolouration of the ceramic.
