Electronic Engine Management

[cfg83]

Hello -

I like this article because it has concise explanations of the different sensors that the car's ECU/PCM is listening to :

Electronic Engine Management, Part 1
26 February 2007
http://autospeed.drive.com.au/cms/A_107971/article.html


I like this unintentional nugget of info :

... A MAP-sensed car with a new exhaust may run lean enough to actually drop power, because the ECU doesn't know that there's the extra airflow. All it knows is that there's a certain manifold vacuum at a certain rpm with a certain inlet air temp ...

Hmmmmmmm ....

CarloSW2

[GasSavers_Red]

Yep, couple that with a reasonably high flow intake and you be in a mildly lean condition most of the time. When you are cruising your 02 sensors would be able to compensate some, but not totally. The Jeeps ECU is a good example. Its too dumb to compensate for some "power mods"