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why would spark plugs be gapped other than the manufacturers specs?
I just replaced the plugs, wires, cap, and rotor. Now my 86 Econoline's 302 will hardly start and will not idle. The plugs I pulled were gapped at 50, but following Fords specs, I gapped the new ones at 44. Could it be some past adjustment or modification made 50 the correct number? I sure hope so because tomorrow I'm re-gapping my plugs to 50.
3 Answers
- white.mike33Lv 41 decade agoFavorite Answer
double check the firing order to make sure you didn't cross a wire, the 50 you pulled out is from burn down wear, im sure they were 44 when installed,,44 should be fine,but if you re-gap the plugs and it still wont run rite you have a crossed wire or the wrong rotor or cap, double check ever thing thoroughly.
Source(s): 123 - 1 decade ago
Plugs usually are gapped to 0.040 inch at the factory, and this setting works well for standard ignition coils. If you replaced all the high voltage wires and are getting a weak spark, there's a chance that the coil is bad. However, check the seating of the high voltage wire that goes between the coil and the distributor cap. If either end isn't properly seated, you may have an inadvertent second spark gap under one of the insulator boots, effectively making the total gap that the current must jump 0.070 inch, or greater. Likewise, check the seating of each of the plug wires, both at the plug and at the distributor cap. If the boots are tight, especially with silicone dielectric grease on them, a cushion of air may form that makes it hard to push the wires all the way in.
Source(s): Personal experience/ - mister ssLv 71 decade ago
call the parts store where you bought the plugs and ask them what the gap is for your vehicle before you take them out again and make sure you have your plug wires on correctly as it sounds like you have one crossed.