What is PM6 (IIRC) map sensor something like that

 

A MAP sensor (manifold absolute pressure) is one of the sensors used in an internal combustion engine's electronic control system. The manifold absolute pressure measurement is critical to an engine's electronic control unit (ECU) in order to calculate fuel and spark requirements. Not all engines use the speed-density airflow determination method, so not all engines need a MAP sensor. A MAP sensor is almost exclusively used in conjunction with fuel injection.

Manifold absolute pressure is an accurate indicator of the mass of fuel an engine requires, vacuum is only a differential to some other pressure. Carburetors relied significantly on vacuum, and although they were precise, they were not accurate fuel metering systems, and therefore unable to satisfy modern automobile emissions control legislation. Accurate and precise air mass measurement is required to meter fuel mass in a stoichiometric manner to achieve acceptable emission control under all operating conditions. A MAP sensor is a component used in the speed-density method of accurately determining the engine's air mass flow rate.

http://en.wikipedia.org/wiki/MAP_sensor

 

so it has to do with vacuum

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tigueremalo &raquo;</TD></TR><TR><TD CLASS="quote">so it has to do with vacuum</TD></TR></TABLE>
lol

it has to do with measuring the pressure of the air coming in to the engine to know how much fuel to add. i.e. if you live at sea level or 10000 feet.