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Re: knocking and pinging under load.
Carbon buildup can cause that. The carbon in the cylinders basically raises the compression ratio (and creates "hot spots"), creating the need for a higher octane fuel. Go to a higher octane fuel and see if it goes away. Don't just switch to the higher octane, or soon it will start pining again, this time much worse. If it does go away, get an induction flush done. BG makes an excellent kit that we have had 100% success with.
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'04 Cavalier coupe M/T 2.2 Ecotec
Supercharged 14 PSI boost, charge air cooler, 42# injectors
Tuned with HP Tuners
Poly engine/trans/control arm bushings
Self built and self programmed progressive methanol injection system
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