Quote:
TxGoat wrote:
Pinging can be caused by a lean mixture, improper initial timing, distributor issues, cooling system problems, improper spark plug heat range or very worn plugs, valve issues, or very low octane fuel. Ethanol fuel will not normally contribute to pinging.
Air leaks in the intake at manifold or carburetor gaskets or any vacuum connection, including the vacuum booster in the fuel pump, can cause pinging. A corroded water distribution tube in the block can also cause it.
Until this spring the vacuum advance on my car was not the correct one, which I knew, and thought maybe it was contributing to the pinging, but the pinging didn't go away when I put on the correct vacuum advance, so much for that theory. But the pinging has gone away at the same time as I changed fuels, but hadn't made any other changes. Causation or just coincidence? I'm not sure. Maybe I'll put another tank of premium in sometime to see if the pinging comes back.
We had a Dodge van with a 360, a long time ago, and it used to ping anytime we put Esso fuel in it, not sure why.
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