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Does anyone know where the map sensor is located and if my surging idle is caused my that checked all my hoses and everything about three times and there all good just can’t find the map sensor
1987 2.0si 5spd manual
 

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The map sensor is located in the black box on the passenger side firewall. You’ll see a bunch of vacuum hoses leading into it with numbers on them. As for surging. That’s likely a vacuum leak. So I’d do a smoke test. That’s usually what the culprit for my car was. And I think In one instance it was the idle air control valve or fast idle thermo valve in the case of the prelude. I believe both are the same just different name.
 
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