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Old 07-26-2000, 05:20 PM
Posts: n/a
I'll add a detail here thats been overlooked - the pickup for the vacuum line that runs to the injection pump is NOT just a hole in the manifold - it's a calibrated venturi. If you measured vacuum directly off of the manifold, the reading is VERY different from the signal going to the IP. Also, not mentioned, but implied, its a REVERSE feedback system - closed throttle induces a higher vacuum, which REDUCES the amount of fuel being injected. Therefore a vacuum leak will give bad mileage, smoke, and, if the pump calibration is off, increased idle speed. The check valve mentioned is most likely the one that's between the intake manifold, and the vacuum pump on the front of the engine.
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