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Discussion Starter #1
I replaced the first COP (coil on plug) at 104 K miles.
Because the check engine light did not come on and throw a code, I had to swap cops across the
different cylinders until I found the bad one. The engine miss did not occur when the engine was cold,
I hade to drive the vehicle for a least 45 min. to get the cop hot enough to cause it to fail.

The replaced the second COP (coil on plug) at 107 K miles.
This time the check engine light came on and it threw a code, so I knew what cylinder had
the bad cop. Again the vehicle ran fine when cold, but after 45 min. driving is when it would
break down from the heat.
 

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The COPs are replace on fail, not a maintenance item. I have seen them fail as early as 50K, but have seen them go 80K plus and still working just fine. Surprised you didn't get a code on the first one. Never seen that before.
 

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The COPs are replace on fail, not a maintenance item. I have seen them fail as early as 50K, but have seen them go 80K plus and still working just fine. Surprised you didn't get a code on the first one. Never seen that before.
It was a 2010 I have a 2016 sonata sport now
 

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I had a Hyundai Sonata with 190 thousand miles I had the original spark plugs and timing belt
You were on borrowed time........
 

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2019 Elantra GT N Line, 2013 Hyundai Elantra GT (SOLD)
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I had a failed Coil Pack at around 42-44k miles
 

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132,000 kms (82,500 miles) all original on 2013 GT.
I did have to replace a crank position sensor under warranty... at 30K kms.
 

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Not a GT but mine are original and so are the sparks. I have heard that the 1st transistor made by TI is still oscillating.
 
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