How to check a plug wire to see if its bad?
On The Tree
Joined: Jun 2003
Posts: 148
Likes: 0
Re: How to check a plug wire to see if its bad? This can be very deceiving. Never assume that just because the resistance on a high tension wire is ok, that it really is ok. Ok? For OEM wires on our cars that are less than a foot long look for @ 3K-5K ohms of resistance, maybe less. Aftermarket wires tend to have much less resistance. If you suspect a wire is bad, swap it with another wire and see if the miss goes away. Do not depend on your ohmmeter to determine the integrity of a high tension wire. A scope is another reliable way to check spark plug wire integrity. However if you do have excessive resistance on one wire compared to the other wires, chances are it is bad.
Re: How to check a plug wire to see if its bad? Open the hood in the dark 
If you see a little electric show going on.. put on new wires
Seriously though.. I normally change my wires ~20-25,000 miles unless I find something wrong.
If you see a little electric show going on.. put on new wires
Seriously though.. I normally change my wires ~20-25,000 miles unless I find something wrong.
