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1978 911SC Engine Knock Under Load

Engine

Vehicle Information: Model: 911SC; Year: 1978; Body Type: Coupe; Total Mileage: 185,000;

Recently, I have noticed my car "knocking" slightly under load (it soundslike the wrong octane is being used - but it isn't). It only occurs fromidle up to 2500 rpm. Once the revs are up, it doesn't occur or at leastyou can't tell anymore. It can only be heard if the passenger window isdown, so it sounds like it is coming from the right side of the engine.There is no noticeable "knock" when the car is not under load. The caris not using an excessive amount of oil, runs "seemingly" well and it isdriven daily about 50 miles.

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