4 isn't firing
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.
> Start with coil, plug wire or faulty spark plug, although if it was the
> 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?
>> Dave D.
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