My truck is 1998 Tacoma XTRA cab with the 2.4 litre 4 cyl engine, 5-SP transmission. I have a pinging problem when I attempt to use regular (87 or 89 octane) gas. The dealer's say it is a problem with all Tacoma 4 cylinders because of the close tolerances in the engine. They said with low octane gas, the carbon buildup causes the pinging. Is anyone else experiencing this problem? My truck has about 29000 miles on it, but it has been doing this since it was new. By the way, I have tried different brands of gas and I get the same results. Thanks for any advice. This is a great truck, but it's a little irritating having to buy premium gas when the owners manual says to use regular.
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