very weak spark on cylinders 4 and 5

[zman525]

Hey everyone, have a little problem here. I seem to be getting extremely weak spark on cylinders 4 and 5. Every other cylinder seems to be great. The plugs are absolutely soaked with gas on those 2 cylinders. I put my inductive light on the wires and checked to see if i would get any readings close the the dist. cap and i did. but as i follow the wire down it gets weak and randomly fires. I replaced plugs, wires, dist cap, and rotor. Coil is also fairly new. I had a spare set of plug wires and tried messing with them, but no luck. any tips or ideas would be great. thanks.

[Carl Beck]

You need to put an Ohm Meter on each individual wire and check to see what resistence readings you get. Could be a lose/bad connection on one end or the other of the wires.

Just a thought

FWIW,

Carl B.

[ezzzzzzz]

Was it running like this before you swapped parts? Were plugs gapped properly? Are wires really cinched down? We are to assume this is a carb'd engine? FO is 153624 so it's not likely you crossed two wires BUT you never know until you really know. Carl

's approach is the most straight forward to assess the wires. I also like to look under the hood in pitch blackless to check for cross-firing (blue aura jumping between wires or other engine parts).