Spark Plug Wires
Posted: Sun Jul 23, 2017 1:00 pm
Our 1999 Plymouth Voyager was having hesitation and missing on take off, pretty much only at idle and would smooth out with rpms. Not running the AC helped prevent this but then it worsened. I took a shot at throwing parts at it, since the plugs had been replaced 10,000 mile ago (gaps were up to 75% larger than spec) I focused on the plug wires, which had about 40,000 miles on them.
I put new wires on and it runs like a champ. No more miss. Just ran the ohm meter on the old wires and got readings of around 3 to 5 among the old wires. That with the meter set to the 20k range. Googling tells me those are perfectly acceptable resistance for plug wires, so I wonder what was the problem. Perhaps a crack that leaks energy to the engine? I did not see any damage or cracks in the wires though. Perhaps the dielectric grease dried out and only needed to be replaced?
I put new wires on and it runs like a champ. No more miss. Just ran the ohm meter on the old wires and got readings of around 3 to 5 among the old wires. That with the meter set to the 20k range. Googling tells me those are perfectly acceptable resistance for plug wires, so I wonder what was the problem. Perhaps a crack that leaks energy to the engine? I did not see any damage or cracks in the wires though. Perhaps the dielectric grease dried out and only needed to be replaced?