Question about 1988 Dodge B350
This is a difficult question to answer in a short manner. The engine uses about a half a dozen sensors to sense how the engine is running.
The throttle positioning sensor tells the computer where the accelerator pedal is, the Map sensor tells the computer how much pressure is in the intake manifold. The MAS ( mass air flow sensor) tells the computer how much air is moving through the intake tube, and the coolant sensors determine engine temp and send this to the computer to aide in idle speed whether it's hot or cold out.
Then you have the 02 sensor which tells the computer how much oxygen is being sent out the exhaust. And lastly the idle air controller, this is what makes the car idle and is influenced buy the other sensors and computer to tell the engine to idle at the factory 700-850 rpm's when warm or 1000-1300 rpm's when extremely cold.
The engine doesn't really relearn it just simply has to read all the sensors again after a reset ( battery disconnect) to go back to the computers default idle speed.
I hope this has in someway explained the way in which the computer and all it's sensors work to help idle the vehicle.
Posted on Aug 07, 2010
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Posted on Jan 02, 2017
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