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Old 5th December 2010
Wagon Wagon is offline
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Default How to know when coil pack is bad

How do you know when the coil pack is fried on a 2007 aero?
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  #2  
Old 5th December 2010
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Quote:
Originally Posted by Wagon View Post
How do you know when the coil pack is fried on a 2007 aero?
when the car begins to misfire at higher loads (usually above 3000 rpm)


You will know when they're going bad. The misfires sound and feel awful, kind of like the car is having a stroke
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Old 5th December 2010
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^^He's right.

My coils are going bad. I've been having shaking/studdering issue upon acceleration- especially when the turbo gauge nears the red. If you persist in accelerating at this point, the engine light will probably blink. I replaced the plugs and it fixed the issue for a little bit, but the problem came back and coils are too expensive for me right now.
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Old 5th December 2010
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it might look like v this take them out and look for the spider cracks thats your bad coil.

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Old 5th December 2010
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You will know if a coil is bad. I just replaced the coil on cylinder #5 two weeks ago and then last week I had to replace #6.

The car will feel like it is hiccuping under load. It is almost like the motor has a studdering problem. If you drive it like a 90 year old it will most likely not do it. If you really push it and it misfires a lot under hard acceleration the CEL (check engine light) will flash a few times and then go away. The code is stored as P0300 (misfire) and P030x (x being the cylinder that is misfiring).

The 2.8T (motrinic engine management) is unbelievably lenient and doesn't like to throw a CEL for a misfire. You have to make it misfire really badly to throw a code.

The coil pack will not necessarily show visual signs of failure!!! The two I replaced looked identical to the ones I replaced (they looked brand new) even though they had 107k miles on them.
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Old 6th December 2010
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Replaced # a few weeks ago. The car will shake and shudder, and sometimes lose power. The CEL will also flash, but not always.
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