no-start diagnosis

[bmrfamly <bmrfamly@xxxxxxxxxx>]

Gentlemen
   In a no-start, you must first determine if you have spark!
   Pull the most convenient spark plug wire, insert a new plug into 
the connector, and ground metal end of the plug to the motor.  Stand 
way back and crank the motor (on some BMWs you can do this thru the 
diagnostic connector, but make sure you're out of gear, as the motor 
may start) while watching the plug for spark.....
No spark...  Check out:
   Coil, coil wire to distributor cap, distributor cap (spring loaded 
center contact) & rotor, flywheel position & speed sensors 
(disconnect and check for resistance 960 ohms +/- 10%).
   Yes spark, no start--- chances are no fuel.....
Check out:
   fuel pressure, fuel pump,

   Always check for spark before checking for fuel.  I've heard from 
owners who found and spilled some fuel, and then found spark......

  Dan Patzer the CyberWrench from BIMMERS ONLY Seattle's exclusive BMW 
hobby shop  
Providing O.E.M. parts, Independent service & Instruction since 1964
  12724  Marine Drive,  Marysville, Wa. 98271  425-259-3601
72' tii touring   K1200LT   85' 732i   R850R 
http://www.nwlink.com/~bmrfamly/ 
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