Mystery Miss No More!!

CLAG500 at CLAG500 at
Thu Apr 26 19:31:50 EDT 2007

Hey Guys,
    OK those who replied that it was something to do with  the RPM sensor on 
the flywheel were 100% correct.
    To resolve the issue I first cleared the 2121 (idle  switch) code which I 
was pretty sure was from having the throttle cable in a  bind. Drove the car 
and got it to miss a few times. Code 2111 shows up. Hmmm I  had that code 
before the car was chipped and before I had the engine  troubles.
  I took the sensor out to examine the wire for  breaks. It  looked OK so I 
wiped it off and put it back in. Car ran so bad that it was  un-driveable. Took 
the sensor out again and cleaned it with brakeclean and blew  the base off 
with compressed air. Car went back to drivable but missing (been  taking the 
other car to work though).
  Somebody on another forum suggested swapping the sensors to see if  the 
problem turned in to a no-start to determine if I indeed had a bad sensor. I  
removed both of the sensors tonight and took the base out and used a file  to 
true up both sides of it. I swapped the sensors and the miss is completely  gone 
now for the first time since I got the car.
 The RPM sensor looked brand new so I'm assuming the previous owner  had the 
same problem. In the Bentley it says that if the RPM sensor is greater  than 
1.24 mm then a miss can occur. I wonder if I just corrected a clearance  issue 
and there is nothing wrong with the RPM sensor other than is seems happier  
reading the flywheel pin instead of the teeth.
 I guess I'll know what it is if I get a no start condition but for  now 
everything seems great and I'm not going to mess with it! Thanks for all of  those 
who replied and those who led me in this direction.

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