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Old 06-05-2013, 12:32 AM   #1 (permalink)
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Default Multiple coil problems with 2011 Accent

My 2011 Hyundai, at 34,000 mi., has had all 4 coils "go bad" one after the other over the past 12,000 miles. All coils were replaced under warranty at the Long Beach CA dealership. Now the first replaced coil has failed and the dealership says the only fix is to keep replacing them. Does anyone know if there is an underlying problem?
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Old 06-05-2013, 12:55 AM   #2 (permalink)
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I just had a coil go bad at 23.4k miles as well.
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Old 06-07-2013, 11:44 AM   #3 (permalink)
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I've heard of coil problems in these cars from time to time, have yet to see it firsthand. 95k+ on ours without a coil problem.

Curious how this plays out...
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Old 09-20-2013, 09:14 AM   #4 (permalink)
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I've had the same problem - the coils went twice, and I'm taking it into the dealer tonight for what is probably the third time. First and second were at ~40k and 50k miles, now it has 61.5k. They blamed it on the plugs, but had new ones put in at 50k too. Did you find out what caused your problems?
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Old 09-20-2013, 12:59 PM   #5 (permalink)
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i would think something "upstream" of the coils is causing them to fail prematurely.

i just hit 100k miles yesterday, not a coil problem yet.
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Old 09-21-2013, 09:53 PM   #6 (permalink)
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has anyone bothered to check the voltage incoming to the coils?
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Old 09-23-2013, 05:20 PM   #7 (permalink)
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I wonder how they break. Do they "burn out" like light bulbs all of a sudden or is it more progressive, and then past a certain point their activity isn't strong enough to do anything? If it is progressive maybe they can be periodically checked how hmaservice says to check them.
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Old 09-23-2013, 05:44 PM   #8 (permalink)
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the coils are really just a transformer - converts current into voltage. you get low voltage and 'high' (ha) current coming in and then very low current and very high voltage coming out. the net energy has not changed minus a small amount lost due to the efficiency. its actually very very small.

so to answer the question of is it fast or not, it really depends on the failure. if insulation on the windings is breaking down, i'd imagine it would happen bit by bit until it his that complete failure point.

if you're getting moisture in there...well i think everyone can figure that one out.
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Old 09-24-2013, 10:06 AM   #9 (permalink)
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my car run up to today 147K kilo and thanks that no problem in the coil...
but my friend called me up today, he said that his car had some misfires symptoms, i said to him to change the fuel filter(cause i change mine already when i have the same problem) but again he still have the same symptoms, let us try to change the coil or the SP wire...
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Old 09-25-2013, 03:27 PM   #10 (permalink)
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or you could diagnose the problem instead of throwing random parts at it. that would be too hard though wouldn't it?
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