![]() Starting at the distributor (but not inside) and tracing each spark plug wire routing could be wires running paralell or near something thats energized and causing some kind of interference ? Bad spark plug wires on one side ? Not likely. Is there some non-stock wiring on the inner fender or that side of the block that is causing interference with the timing light? Joe, Since they are on the same cylinder head (side), that is the commonality. There MIGHT be some weird thing that's happened to the plug wires on that side, or something, but apparently those cylinders are firing. As I said, the only thing I can figure is that there is some electrical issue that is causing weak spark on that side, such that the spark is too weak to trigger the light. The contacts in the cap have nothing in common. ![]() They aren't even every other firing pulse, since the firing order is 1-8-4-3-6-5-7-2, so the firing goes L-R-R-L-R-L-L-R. The only commonality is that all are in one cylinder head (thus my Ford comment above). It's oddly out of the ordinary when something works on only even numbered cylinder wires - that is bizarre.Įlectrically, there really isn't. And, I'm thinking to myself - why do you need that many controls and that many settings to test one single wire. I asked and mentioned a gazillion timing lights merely to suggest in some cases I've seen some of these new digital timing lights selling for $10-$15 and the instructions (when you look at them) are the size of a Britannica Encyclopedia. I believe most of us agree this should work on every single plug wire as you mentioned. I'd probably start with a spark tester and compare the spark from the right with that from the left, though I have no idea what could cause a side-to-side discrepancy.Good point on the spark tester. I've had situations where the spark was too weak to trigger the timing light, but that was on all cylinders, not just one side of the engine. If the engine is running on more than four cylinders, then the problem has got to be a weak spark or similar issue on that side. The OP mentioned that orientation was correct, so I assume that means that the clamp-on timing light pickup has the arrow oriented towards the spark plug as required. I have no idea, but if it works on any one spark plug the timing light is not the problem.
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