![]() ![]() If a coil has failed, you'll find one cylinder is much colder than the others, and another is either cold or very hot. Use the thermometer to measure the exhaust manifold as close to the exhaust ports as possible. It doesn't have to still be running, just very warm. To check to see if a coil has gone south: Use a laser thermometer, go underneath right after it's been running a few minutes. Wonder if that's why the previous owner sold it? Being new to him he might not realize it's low on power. If both are misfiring it won't feel like a misfire - no running rough, it just has low power. ![]() A coil that's failed in the rail can kill 2 complimentary cylinders. It makes me wonder if it's a later model 6 cyl TJ with the coil rail. I'm surprised he's complaining of a flashing light and NOT a misfire. If you try to fix it by replacing the cat without curing the misfire, your new cat will plug and burn too. Plug, cap, wires, vacuum leak, injector, coil rail, etc. The cat is not causing the problem, the misfire is. I suppose it could affect an auto trans from all the heat. If the cat's just mildly plugged from it, sometimes driving it after the misfire is cured it can clear itself out, but it will get super hot when it's clearing. It can even cause a fire if there's enough unburned gas in it. If the cat gets too much of it it plugs the tiny holes in it, rendering it useless. Check the codes and you'll see it has a bad misfire.Ī bad misfire puts unburned gas in the cat. ![]()
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