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OK thanks.
So is the amount of vacuum used as an indication of the load on the engine? Why is it there on these cars, when there's also in air flow meter which would measure the load on the engine? Are the two combined?
There is for example a vacuum pipe to the ignition control module (I believe your car doesn't have this). Is this so the ignition module knows the load on the engine and can adjust ignition timing accordingly?
There's also vacuum lines from the sensor block (top front of engine), the bottom of the intake, the throttle body. Why so many? What's it all for?
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