Date: 8 May 2002 13:27:36 GMT
Subject: Re: My dealer hasn't got a clue, can you help? ('97 9000 Aero, Manual)

Someone who looks an awful lot like meme meme <> wrote: > A 97 9000 areo have no knock sensor, the ecu detects knock through the D.I. > Knock Sensor has nothing to do with boost, as the ecu retards timing when it > detects engine ping, not boost. I would suggest that the piping to your APC > is incorrect. So, the DI senses the knock? What, impedance in the combustion chamber as measured by the spark plugs, or what? What's the sensing mechanism there, and how does that information get fed back to the ECU for it to back down the boost? Actually, the theory still holds even though the hardware is different - whatever is sensing predetonation, or should be, is apparently not doing so. Since they've replaced everything involved except possibly the left-rear taillight, maybe it's time that they try a DI cassette. Dave Hinz

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