Mitsubishi FGC20:
Weak ignition spark

i am looking for the revision that applies to the square block coil on the 4G63 engine.we have replaced ignitors,coils and still have a very weak orange spark.Have checked engine grounds and such prior to replacing any ignition parts.It seems that the only way to increase the spark is to run a hot straight off the battery to the coil.supposedly a psb was put out on this by mits but I cant find it.Thanks for any help.
  • Posted 25 Jan 2011 06:40
  • Discussion started by ray_k
  • Ohio, United States
RAYK@MIDOHIOFORKLIFT.COM
Showing items 1 - 1 of 1 results.
what serial number series?
I am pretty sure about the only PSBs MCFA has ever put out in relation to the "square" coil was one about the sympathetic vibration between the engine, the frame and the coil bracket which caused the coil bracket to crack and or the switched battery positive wire breaking internal to the insulation (which can be a cause of backfire). For me, pulling on the wire usually shows some point that it stretches, where the insulation is still good but the wire inside is broken, very often in the short bit of wire that runs between the frame and the coil.
Now, that said, how are you watching the spark*? What is the voltage of the battery while cranking? When you tried a new pickup in the distributor, and did you install it correctly using the correct grease? Have you gapped the plugs? (no guessing, it really does make a difference, on this motor especially). Is there ANY side free play in the distributor shaft?
I do admit to always carrying the bit of pre-made wire harness that runs between the coil and the distributor, and sell it along with a tune up.

~ just joking below this point~
* = can you get a video for you-tube of an intern to hold the spark plug wire in one hand and turn the key with his other hand?
~don't try this at home ~
  • Posted 25 Jan 2011 10:24
  • Modified 25 Jan 2011 10:32 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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