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Manifold absolute pressure sensor, being hondas run of calculations to adjust fuel to air ratio (called speed density) they require this to calculate amount of fuel to use. This is on top of the manifold dependant upon year b18 head, Da's had sensors located on firewall. B20's have the exact same head cast and cams as a b18b head. unless your refering to a vtec head there is no difference.

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Q: What is a map sensor and where on a 90 Civic with a b18 head and a b20 block?
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