Thread: 305 Update: new gaskets, Dieseling, misc

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Are you dealing with dieseling, or are you dealing with pre-ignition?

Assuming it's pre-ignition under load - If you can run 87 octane without pinging, then you get the most power from it. If you get a tiny bit of "ping" at heavy throttle under a load (driving up a hill, into the throttle, no kick down; or rolling start WOT) try backing out 1/2 degree of base timing and see if it goes away. If not then you may need to bump up to mid-grade 89 octane, but avoid that if you can. You get the most power by running the lowest octane you can run without ping, and a tiny bit of mild, random "clatter" at highway speed, WOT is telling you you're just about perfect on fuel choice, timing and mixture.

Get your gas from a good station that runs a lot of customers through every day so you know that their storage tanks are getting refreshed often. Around here QuikTrip is a good choice if you don't have to have no-ethanol gasoline, or any of the majors in a good, high traffic location.