McLegacy Posted November 10, 2016 Share Posted November 10, 2016 A year ago, I took my car up to Tahoe. The car was misfiring the whole way there and back, and I discovered the coil pack node connecting to the passenger front(#1) spark plug wire was corroded with carbon buildup. The spark plug wire was bent inside, and I figured that the last person to change the wires must have bent it, and the poor connection caused arcing or something else. I replaced the coil pack & the spark plug wires (not the spark plugs) and the misfires went away. Read more here. A few months ago I noticed a small amount of corrosion on the same node of the new coil pack . I replaced the spark plugs hoping that it would solve the problem. At this point, I have a new coil pack, spark wires, and spark plugs. The problem has gotten WORSE even with new components. I took pictures of components and compiled it into an imgur album: http://imgur.com/a/j1GSP I am not getting a misfire, but how can this happen?? I am thinking it might be because I did not replace the spark plugs at the same time as the wires and the coil pack. Maybe it's the connector? I noticed (just now) a super high pitched whining noise coming from the area around the coil pack. I couldn't pinpoint the source but I think it may be the connector, which would make sense. Related: I had trouble with my alternator and my battery before. The headlights still dim sometimes but not nearly as much since I replaced the alternator and did some grounding work. Read more here. So if any of you subaru jedis know what's happening, I would REALLY appreciate it. Thanks guys. Link to comment Share on other sites More sharing options...
Setnev Posted November 11, 2016 Share Posted November 11, 2016 Check your engine grounding straps. I believe there are 3 or 4 total that connect to the engine. Additionally, make sure you're dealing the spark plug boots and the coil connector with dielectric grease to keep moisture out. I see you're in the Bay Area, which would explain excessive humidity building up on your coils. The high voltage of the coil pack creates a temperature inversion that attracts humidity as it cools. Link to comment Share on other sites More sharing options...
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