Posted by ASEguy on November 17, 2010 at 01:36:09 from (24.171.3.89):
In Reply to: Re: Fixed it posted by jdemaris on November 16, 2010 at 18:40:43:
It knows two cylinders are off because the crankshaft doesn't speed up enough relative to camshaft speed after the combustion event. A misfire isn't actually a complete misfire always. Partial misfires qualify also and reasons could be gap too wide on spark plugs, poor injector spray, or inadequate cylinder filling due to a timing belt being off one tooth or more. Knock sensors don't hear ignition for the purpose of misfire detection. They hear abnormal ignition of the air/fuel charge. On some OBD II equipped vehicles the PCM "learns" the position of the belt(put on wrong) and sets a code (Timing belt off one tooth or more). Then you have to go into the PCM and do a relearn of the crankshaft position after the technician reinstalls the belt correctly. Most OBD II vechicles have to have crank and cam sensors for misfire detection. As I mentioned to Kirk above OBD II OEM scan tools have so much information available to the technician it's amazing. Gerard
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