4 isn't firing

schnowz schnowz at localnet.com
Tue Aug 5 17:29:37 PDT 2008

   That would also be the case (2 cylinders not firing) for the wire if it 
was a bad connection eg green snot at the end of the wires where the copper 
wire used to be, because the 1 and 4 are in series. The only way it would be 
one cylinder, would be if it was a bad connection and also shorting to 
ground somewhere (bad insulation etc). You can also ohm out the leads and 
caps - the resistance is in the book IIRC.  Though this will only test 
resistance of the wire/caps and won't necessarily tell you if you are 
getting high voltage leakage on the insulation. Only way to do that is swap 
the wires with a known good one and the cool header should move with the bad 
  If it's doing it only at small throttle openings I would also suspect the 
pilot circuit - carefully take out the pilot screw after putting a towel 
over the engine. Make sure you get the o ring out too. Squirt some carb 
cleaner in there and then follow with compressed air. You can get the screw 
out by placing a short screwdriver bit in a socket and turn the socket with 
your fingers (not a rachet - which is too big)  Before taking it out screw 
it in carefully and count the turns to bottom out - when reinstalling - turn 
it to the same position as before.
 By the way a infrared thermometer fired at the exhaust headers are great 
for checkin which cylinders aren't firing.

Pete Staniforth

> Start with coil, plug wire or faulty spark plug, although if it was the 
> coil
> you'd probably see two cylinders not firing.
> Bill in Yardley, PA
> wkdenton at verizon.net
> ----- Original Message ----- 
> From: "Dave Daniels" <dwaynedaniels at sbcglobal.net>
>>  So, it seems no. 4 isn't firing.  Any ideas?
>>  Thanks,
>>  Dave D.

More information about the GPZList mailing list