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Re: Spark knock on '89 Olds Calais 2.5 litre.
Posted to Technical Discussion Forum on 10/1/1999 1 Reply

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Light throttle spark knock? Mine's an 87 and it does it too!

There were some calibration (PROM) changes on some GM 2.5s in the late 80s but I don't have bulletins handy right now so I can't check fo... Login to read more.

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