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Old 10-01-2019, 12:38 PM
jojonh01 jojonh01 is offline
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2002 Altima Sedan
2002 Altima 3.5 SE
 
Join Date: Oct 2019
Location: California SF Bay Area
Posts: 2
Default Sudden Engine Noise

About 7 months ago I had a P030x code, which is a cylinder misfire and which turned out to be a bad ignition coil. I went ahead and brought a replacement set of 6 from Amazon. Had my mechanic replace them all + a leaking valve cover and everything was holding up reasonably well until last Saturday when I started getting the same symptoms I had with original misfire code. I managed to limp home from where I was, about 1.5 miles and got the OBDII code reader out.

The code reader showed a P0302 code, which is a cylinder 2 misfire. I figured one of the cheap Chinese coils had gone bad. So ordered another set of different cheap Chinese coils, which arrived Monday. Swapped out the cylinder 2 coil and started the car up. It ran a lot better than it had Saturday but was now making some ugly noise I have not heard before.

I then turned the car off, cleared the OBDII code and did another scan. Again, I get the P0302 code! Huh? Could I have the bad luck to get another bad ignition coil in a new batch of 6 coils? I could change another coil out but unsure if whatever is going on in the engine is damaging them.

To me, it sounds like valve tapping but for sure it isn't normal. Anyone want to hazard a guess as to what is happening and maybe suggest some actions for me to do?

Here is a link to the video/sound:
YouTube

Last edited by jojonh01; 10-01-2019 at 12:41 PM.
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