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I meant to submit a picture, but if you’ve seen one ignition coil, you’ve seen them all.

Okay that’s absolutely not true. Not true at all…

First one I bought, from a “guaranteed fit” website, did not, in fact, fit. My car has a 4-pin connector for the coils. This one had only three. So back it went. Went to the dealership and got the correct coil, which is what I should have done in the first place. Serves me right for trying to save a couple bucks…

Swapped it out and goddamn it’s like having a whole new engine! I had no idea one sickly coil could make that much difference in an engine’s performance. This thing much have been bad long before it started throwing codes.

The old one looks fine on the outside. I’d imagine whatever’s bad is somewhere inside the epoxy, which I’m not going to bother digging through to find. Cleared the engine code and I’m gonna hold on to the old one just in case.

First time doing this too. Had no idea it was that easy. I’m not really a car guy.

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[-] XeroxCool@lemmy.world 3 points 3 hours ago

Generally what I've read is the epoxy tends to break down and allow high voltage shorts internally. Nothing to really see and very difficult to test. They usually pass standard continuity and resistance tests.

I've had a handful of individual coil-on-plugs fail, couldn't see anything. I had a failed 4-port coil pack that had a hidden crack found by seeing spark discharge outside the plug

this post was submitted on 17 May 2026
34 points (100.0% liked)

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