From: kludge@panix.com   
      
   Pedro Valdez   wrote:   
   >On a GM3800 engine, the coils are 6000 ohms new. On a misfiring engine, I f=   
   >ound one was 8100 ohms. Now I have had one go open circuit. I could underst=   
   >and insulation breakdown causing short between windings and lower resistanc=   
   >e. But how do you get high resistance? Bad solder joint?   
      
   An open combined with leakage across the gap.  Maybe you had a shorted   
   turn and the shorted turn burned through and now you have a thin spray   
   of metal across the gap.  Maybe the coil overheated and the insulation   
   burned forming conductive carbon paths between turns, before it went open.   
      
   You can unwind it and see for yourself if you want but it's a real pain   
   in the neck... even harder than older single-coil coils to get all that   
   tiny wire off intact.   
   --scott   
   --   
   "C'est un Nagra. C'est suisse, et tres, tres precis."   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)