Starters and Ignition Systems
VW Rabbit
Ford Expedition XLT

What is a coil and how does a bad one effect a vehicle?

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2012-05-13 11:36:50
2012-05-13 11:36:50

A coil is what gives you spark it distributes the power to your spark plugs so it would run bad or not at all check for spark.

The coil produces the power for the spark to ignite the fuel/ air mixture in the combustion chamber of the engine . The distributor systematically distributes or places that spark to the spark plugs in the firing order .

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Yes as the coil provides the spark or fire to ignite the fuel. Most definitely on a vehicle with one coil. On a vehicle with multiple coils, it may start but miss.

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if it is a waste spark ignition, and if they are companion cylinders (changes from vehicle to vehicle and motor to motor, if one and three both have wires running to the same coil, then they are) then chances are you have a bad coil. replace the bad coil and be on your way.

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Unplug ignition coils one at a time until you find the one that doesn't effect the rpm's.That's the one that's bad.

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Viruses is the bad effect of internet.

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If the coil is bad you do not fix it you just replace it with a new one.

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If just one cylinder miss fires, that is not the coil. Only if you have a coil on plug engine.

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Sounds like the coil is bad on the one side ,need to replace coil .

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Go to AutoZone have them rear your codes for FREE. This way you will know which Coil Pack is goig bad / or is bad. If you have a 4.6L you will have only 2 Big Coil Packs. If you have the 5.4L you will have 8 Coil Packs , One coil pack for each cylinder.

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Suspect a bad coil or failed engine computer.

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drivers side front of the vehicle near bumper.

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Depends on the vehicle. Give us more info.

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Then there is a no spark condition and engine will not run. If it has more than one coil pack it will miss on the cylinders controlled by the defective coil pack.

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No You Only Need To Replace The Bad One.

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Replace them in pairs. If you replace one front, replace both. One rear, both.

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Have vehicle scanned to determine the problem--sounds like one cylinder not firing, perhaps bad coil if Coil on Plug Model or bad piston or valve. May need a compression test to determine

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every gas engine has atleast one coil, in a vehicle older than say 10 years it probably has one coil that leads to a distributor which has a spark wire going to each piston. The SVX has SIX coil packs, one on each cylinder. No spark plug wires, no distributor.

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you need a new distributor That can be one cause for this, could also be bad ignition coil, coil wire, or even spark plug wires. Test for spark at the coil, then coil wire, then the plug wire.

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Bad coil, a new one fixed my 2004 2.0

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Auto Zone will check your codes for FREE... It will also tell you which one is bad.

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Bad plug Bad coil Bad plug wire Bad valve Blown piston

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To see if a coil is bad in a 2012 3.6 Dodge Journey; take the spark plug out, hook it up to the spark plug wire and try and roll over the motor by starting it. If there is no spark it is bad, if there is spark you are fine. Or you can take it to a Auto Parts Store and have it tested. Remember; if you replace one coil, replace them all. Otherwise you will burn all of them up with one coil burning hotter than the others.

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One cause would be a cold spark which means you have either a loose coil wire or a bad coil.

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Usually a bad coil , or plug. if the injector was bad , the computer would have coded for it. But the cylinder 3 coil and plug arent that easy to get to. Its the one at the fire wall


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