Quote:
Originally Posted by Dougal
...Some engines have an altitude compensator (FSM calls this an aneroid) which is a round device with no lines attached...
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On my 4BD2T, Isuzu uses a clever trick to reduce fueling when the engine coolant temp gets too high. They apply a regulated vacuum from the vacuum pump to the altitude compensator to make the IP think that it is at a higher altitude and therefore reduce fueling. Therefore, the port on the altitude compensator does have a line connected from it to an electrically-controlled valve. The 4BD2T also has a boost aneroid. None of my 4BD1T's have a hose connected to the altitude compensator nor do they have a boost aneroid.