Common questions

What are the symptoms of a bad coil to distributor wire?

What are the symptoms of a bad coil to distributor wire?

If you suspect a bad coil-to-distributor wire, there are two main symptoms to look for. If the engine stops and starts erratically while driving, or if it cuts out altogether and refuses to restart, you may have a bad wire between the coil and the distributor.

Where is the negative coil wire on a car?

Locate the negative coil wire. On most cars made before 1980, this wire connects to the points switch, which is located on the distributor. The distributor connects all of the spark plug wires. Most newer cars do not have a points switch, so that terminal is connected to ground or the negative terminal of the battery.

What are the symptoms of plug cap coil failure?

The symptoms of Plug Caps/Coil Wires/Coil failure are poor starting, some mid range lag and possibly Poor Gas Mileage. Adrian noted that this didn’t distinguish between the three, but you CAN test each of them and isolate which one it is.

Are there any electrical problems with my Suburban?

With another truck, I’ve had problems with a coolant leak letting traces of anti-freeze into the distributor cap and causing the exact same problem this truck had… difficulty starting in damp weather with a cold engine.

Locate the negative coil wire. On most cars made before 1980, this wire connects to the points switch, which is located on the distributor. The distributor connects all of the spark plug wires. Most newer cars do not have a points switch, so that terminal is connected to ground or the negative terminal of the battery.

If you suspect a bad coil-to-distributor wire, there are two main symptoms to look for. If the engine stops and starts erratically while driving, or if it cuts out altogether and refuses to restart, you may have a bad wire between the coil and the distributor.

The symptoms of Plug Caps/Coil Wires/Coil failure are poor starting, some mid range lag and possibly Poor Gas Mileage. Adrian noted that this didn’t distinguish between the three, but you CAN test each of them and isolate which one it is.

With another truck, I’ve had problems with a coolant leak letting traces of anti-freeze into the distributor cap and causing the exact same problem this truck had… difficulty starting in damp weather with a cold engine.

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Ruth Doyle