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Re: exhaust backpressure/vacuum correlation
Posted to Technical Theory Forum on 6/26/2008

the scope waveform shown is from a Fluke PV350 connected with an adapter to the spark plug threads in place of the spark plug in cylinder 4 of a 1996 BMW 328is. the engine is running at idle with a WOT snap or a strong goose anyway .

running compression wave... Login to read more.

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