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Damn good EFI article. 


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 Post subject: Damn good EFI article.
Posted: Mon Feb 21, 2005 6:09 pm 
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Posted: Mon Feb 21, 2005 8:59 pm 
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good read... very informative... some things definately learnt!

Cheers for that




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Posted: Mon Feb 21, 2005 9:16 pm 
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A bit more on topic for us blue oval fans is this page. It may have been posted before, not sure.



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Posted: Mon Feb 21, 2005 10:30 pm 
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Failure mode is a stand in strategy in the EEC designed to maintain vehicle operation should one or more sensor inputs fail. When a sensor input is perceived to be out-of-limits by the EEC, memorized data from the computers KAM memory will be initiated. EEC continually checks the sensors against its records of normal readings during operating conditions similar to its current state. Hold on that sounds hard! Not really, randomly EEC looks at the past to see if the engine is somewhat where it usually is. If for some unknown reason a sensor is off the charts, it can’t be trusted. So instead of tuning the engine to a possible faulty sensor reading and harming the engine and drive-ability; EEC replaces the sensor reading with a best guess from a past memory. This is why unplugging the battery to fix something works against you. Unplug the battery causes EEC to memorize all the sensor data as base line and normal. If it memorizes a bad sensor it will take it longer to call it a liar. Ford did however give EEC a very broad idea of what the sensor should be reading in its permanent ROM memory, so it will catch on to failed equipment sooner.
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