P0302 Cylinder Misfire

Hug0 · 05-24-2020, 12:27 PM

Hi everyone, I am tracking down similar problem with my 2009 370Z with Uprev and exhaust, intake, etc.. 160 000km

Couple weeks ago car started turning off fourth cylinder. It was after cca 15km drive and only mornings (around 5°C). After Turning off engine, error was gone.

Than it runs normally for couple days. Than again same error. And again, just turn off engine and everything was normal after new start.
There was no error codes.

After week, I finally read codes on running engine and it was P0304 cylinder misfire.
Than sometimes turning off engine does not help.

So I changed all spark plugs and move coil from 4 to cylinder 2.

After that, I am running on five cylinders all the time. Same error code.
I tried spark with coil and spark plug from another cylinder and there is no spark on cylinder four.

on coil sockets there are three wires, one is 12V when ignition is on, second one is ground and on third one I found some readings with multimeter cca 0,6-1,2V in impulses when starting engine. But I am really don´t know if its correct or not.

Also I changed left cam sensor for right one, still same problem.

I really hope its not dying ECU..

Uprev and everything else was there before this problem and worked well.

Any ideas, please?

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05-24-2020, 12:27 PM	#1 (permalink)
Hug0 Base Member Join Date: Aug 2019 Location: Czech Republic Posts: 17 Drives: 09 370Z 7AT Rep Power: 7	Hi everyone, I am tracking down similar problem with my 2009 370Z with Uprev and exhaust, intake, etc.. 160 000km Couple weeks ago car started turning off fourth cylinder. It was after cca 15km drive and only mornings (around 5°C). After Turning off engine, error was gone. Than it runs normally for couple days. Than again same error. And again, just turn off engine and everything was normal after new start. There was no error codes. After week, I finally read codes on running engine and it was P0304 cylinder misfire. Than sometimes turning off engine does not help. So I changed all spark plugs and move coil from 4 to cylinder 2. After that, I am running on five cylinders all the time. Same error code. I tried spark with coil and spark plug from another cylinder and there is no spark on cylinder four. on coil sockets there are three wires, one is 12V when ignition is on, second one is ground and on third one I found some readings with multimeter cca 0,6-1,2V in impulses when starting engine. But I am really don´t know if its correct or not. Also I changed left cam sensor for right one, still same problem. I really hope its not dying ECU.. Uprev and everything else was there before this problem and worked well. Any ideas, please?