Question

What could be wrong with my car

Feb 5, 2020 6:46PM PST

I have a 2009 Nissan Altima- 2.5 4 cyl. It started misfiring real bad the other day out of nowhere driving home from work. Got the code checked and it was P0302. Cylinder 2 misfire. Bought some plugs to start and see if that would fix it. When i pulled the coils, there was a lot of oil in the first tube and a few smalldrops in the fourth tube. I cleaned that out and replaced the valve cover gasket. Replaced the plugs and it is still misfiring. I took the coils out and put a multimeter to all of them to see if any of them were dead. They all had some juice in them. I am stuck as to where to look now. I fear I may have a warped cylinder or something. Any ideas as to what I should do next or what could be the problem?
Thanks

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This sounds like a Samcrac story.
Feb 5, 2020 7:28PM PST
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Answer
sounds to me like a bad fuel injector
Feb 6, 2020 3:30PM PST

Coils OK, new plugs, the only thing left is fuel problem. However that misfire message could indicate an intermittent missing bad coil. A coil can fire OK when cold and then due to a broken circuit when heat increases it makes the broken wire move away from each other, circuit collapses and then nothing from it until cool again. I'd replace first the coil on the cylinder indicated, or switch coils between it and another cylinder, reset the codes and then see if it indicates the cylinder you moved it to now showing a misfire. If so, then you know it's intermittent coil causing it.

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