2006 TL with Manual Trans 96k.

Last week I took the car to a local dealer to have Rear Brake Pads/Rotors replaced. I start my car and notice that the engine seems to be "pulsing" at startup and the exhaust sounds similar. No CEL. I drive the car for about 2 days experiencing the same symptoms. No noticeable decrease in performance, exhaust sounds pulsing, no noticeable MPG drop (maybe 1MPG). I get a check engine light on the second day - it gives me P0302 Cylinder #2 misfire on the advanced auto code reader. I search online and find information about water on PCM, A/C drain clogged, or bad coil pack. I start with the coilpack and buy a new one along with new plug (Plugs were replaced with NGK iridium about 12 months ago). Next day i get my code reader and check it again i get:

p0302
p0304
p0300 - random misfire

I go ahead and replace cylinder #2 coil pack with my new one + new plug. This is what the old pack looked like:


The code is gone and car is running good again. I'm wondering what caused the coil pack to melt/burn up. After reading about the PCM getting water on im a little nervous. I check the A/C drain and a moved it around and some water dripped out. I felt the PCM and it does not feel damp and everything looks dry in there. How can i go about further checking the PCM without tearing it out of there? (i just folded the carpet back and reached in, also checked the inside drain as well)

What caused a coilpack to go? Just old age?

Thanks for reading

 

 

in your case I would say its from old age, if the PCM short circut the coil pack will melt. Also I would looking into replace to clear the A/C drain tube to prevent further issue.

 

The coil pack didn't melt, if it had you probably wouldn't have been able to remove it easily, or remove it at all. When removing coil packs, many will find the tips actually stay with the spark plug and yours could have been cracked/broken during installation, or just broke during removal.

 

Ok thanks for the replies. Everything is back and running normally