VAC sensor
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Car: Yes
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Re: VAC sensor
"VAC SENSOR" on the diagram is for the ECM. It's also called the MAP sensor (manifold absolute pressure). It is located physically just below the windshield cowl near the brake booster.
It tells the ECM how much vacuum the engine is generating in the intake manifold, which is a measure of relative engine load.
The thing that works the cowl hood isn't a "sensor"; it's a motor. A diaphragm like the ones in the HVAC system and the brake booster. Since it's a "car" accessory, and not part of the "engine" as such, it's not on that diagram.
It tells the ECM how much vacuum the engine is generating in the intake manifold, which is a measure of relative engine load.
The thing that works the cowl hood isn't a "sensor"; it's a motor. A diaphragm like the ones in the HVAC system and the brake booster. Since it's a "car" accessory, and not part of the "engine" as such, it's not on that diagram.
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Car: 96 Impala 84 berlinetta
Engine: LT1
Transmission: 4speed auto
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Re: VAC sensor
on my 84 H 305 the Map sensor plastic tube was leaking at the map rubber boot caused the engine to run odd..
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Car: 84 TA orig. 305 LG4 "H" E4ME
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Re: VAC sensor
By swapping to a manual carb, the ECM is not going to control it's other functions as designed (distributor advance, torque converter lockup, etc).
You can't just remove half of the system - you have to go all the way or get the entire system working as intended.
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