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Alaska Jim · 10-09-2019, 03:11 PM

How old are the spark plug wires? if they are old , you could be getting "leakage" out of one or more wires , causing a misfire. if this is the case, sometimes this problem can be seen at night with the eng. running, the hood open and all the lights off. some times you can see the wires arcing back and forth. the best way the average guy can check for bad plug wires is with an ohm meter, if you have one. there is usually a spec in some manuals of how many ohms per foot of plug wire is allowed. this will also depend on the type of wires. can't remember the spec's off hand . I am sure some one here knows.

10-09-2019, 03:11 PM	#10
Alaska Jim Senior Member Join Date: May 2010 Location: Palmer, Alaska Posts: 1,575	Re: Backfire How old are the spark plug wires? if they are old , you could be getting "leakage" out of one or more wires , causing a misfire. if this is the case, sometimes this problem can be seen at night with the eng. running, the hood open and all the lights off. some times you can see the wires arcing back and forth. the best way the average guy can check for bad plug wires is with an ohm meter, if you have one. there is usually a spec in some manuals of how many ohms per foot of plug wire is allowed. this will also depend on the type of wires. can't remember the spec's off hand . I am sure some one here knows.