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Old 02-26-2007, 08:01 PM   #1
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Electronic Engine Management

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 :
Quote:
... 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
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Old 02-26-2007, 09:04 PM   #2
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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"
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