Quote:
Originally Posted by logician
Great suggestions everyone. I'm trying to queue up a bunch of things to try when I go to my shop later today.
Question: how does the DME determine if the engine is turning over and so to enable fuel? Some cars do that via the air box, so if the computer sees any airflow, it knows the engine is turning over. Is this what the 911 DME does? Or does it use other means (the crank sensor, etc?) I'm trying to understand if a bad air box could be a scenario.
(Missing OBD2... it seems unfathomable these days that anyone would design a computer controller without any diagnostic ability.)
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The DME ECM uses the reference sensor to indicate that the engine is cranking.
Subsequently the speed sensor is required to actually develop spark and injection
pulses.