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I live in Snellville. I'm glad you found the problem and have a good, honest mechanic. Isn't it a bear when you have to go out and hit the fuel pump with a hammer every few miles? I wouldn't worry too much about a repeat performance, my 940's each have over 175k and all pumps are still original. I'll keep my fingers crossed but my experience has been good with the things.
As far as the gas, use the lowest octane that the car does not ping with. If it pings, you will have decreased performance because the computer will automatically adjust the timing to compensate for the ping, this will decrease power production and therefore, performance. Using an octane that is too high will not hurt anything but your wallet, so try a tank of each grade and see what happens. I have found, the more mileage, the higher the octane necessary because of carbon buildup in the combustion chamber resulting in a higher compression ratio. I used to get along fine on dirt cheap regular unleaded but of late have had to move up to midgrade to keep from pinging. An occasional ping probably won't hurt anything but a steady diet will eat away at the piston and could eventually knock a hole in it. Not good.
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Bob Kraushaar '94 945T, '91 940T(back from retirement), '88 240, '84 242Ti, '94 F-150, '88 300TE, '89 560 SL, '68 Shelby GT-500 KR
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