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1989 944 Pinging sound

Engine

Vehicle Information: Model(924/944/968): 944 n/a automatic; Year: 1989; Body Type: Coupe; Total Mileage: 145,000;

I'm hearing a pinging or knocking sound during the beginning of acceleration or when going up hill. I use the highest grade of gas(93), the spark plugs, wires, distributor cap and rotor have been replaced by a Porsche repair shop.

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