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John Deere Lx178 Only One Coil Fires.


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#1 Rocking416 OFFLINE  

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Posted August 04, 2013 - 03:36 PM

I have a john deere LX178.  with kawasaki FD440V ( Vtwin )   Only one coil will fire,  if i switch the coils  still just the one side will fire.   so i know the coils and resistors are good.  i am thinking pick up coils?   any help would be appreciated.


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#2 olcowhand ONLINE  

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Posted August 04, 2013 - 04:19 PM

It would almost have to be a pickup coil, or break in a wire on that side.  Only way to know for sure is to switch out the pickups.



#3 Rocking416 OFFLINE  

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Posted August 30, 2013 - 06:25 PM

Just so everyone knows.  It was the Ignitor box causing the problem


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#4 Rocking416 OFFLINE  

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Posted September 14, 2013 - 07:25 PM

This is what it came down to.   I had a weak poor running engine.  i pulled the spark plug wire on left side the engine would STOP.  If i pulled the spark plug wire on the right i noticed no differnce at all.  So first i pulled to valve cover to make sure i did not have bent push rod or broken rocker arm.  Cranked the engine over and watched the valve train work.  Next i switched ignition coils.  By switching the ignition coils did two things. Tested the suspected bad coil and comfirmed that it was isolated to the right side.  next i measured Ohms of the pickup coils.  Then i spun the engine over and set my voltmeter to AC scale and measured the AC current from the pick up coils.  Baiscly i made sure the ohms and AC voltage was the same or very close.   It ended up being the ignitor box.  i paid dearly for the ignitor box  but also learned how to diagnose a more complex ignition system.  and i hope this post helps somone else do the same. 

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Edited by Rocking416, September 14, 2013 - 07:33 PM.





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