Nissan 370Z Forum - Dreaded P0300

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- - Dreaded P0300 (http://www.the370z.com/engine-drivetrain/133695-dreaded-p0300.html)

Hi guys looking for some solid advice. Been trying to fix this code for awhile now and seems to go away then come back. Replaced all spark plugs about 2 months ago. Upgraded to GTR injectors this month and currently in the process of gettting tuned by Moncef over at Admintuning. The car finally gave me a p0306 code after I cleaned my throttle bodies today. I checked the coil pack to see if it was a bad coil pack. I unplugged it and it didnt seems to make a difference in the overall idle. I figured to myself finally i found the source of my p0300 code. So i switched the coilpack 1 with 6 to confirm my thoughts. When unpluggin coilpack 1 the one i thought was bad once again no difference. So yay right? bad coilpack but heres the twist i went back to plug 6 and unplugged it and same thing not much of a difference in idle at all. Seems that im running around in circles here. Ive cleaned the maf sensors and dont have any other codes popping up. Very frustrating but the car is obviously having issues. When coming to a stop the car wants to bog out and die then idle returns back to normal range. Any one have an idea of where to troubleshoot further

Just purchase a single coil pack to see if i replace the cylinder 6 pack if it will make a difference. :0 also car is at 81k miles currently

better than having P0COVID

In a 6cyl, whether it's one or two dead cylinders, it's hard to tell. I would check continuity on the suspected coil.

Just swap the coil packs around, clear code and see which code comes back. Could be simply you damaged one of the coil packs when you were doing the plugs. Or even a bad new plug as well.

Quote:

Originally Posted by v8Destroya (Post 3929327)

gettting tuned by Moncef over at Admintuning.

:eekdance:

compression test it and switch tuners heh

You might want to check the fuel pressure. I have seen a few P0300 that were a result of a weak fuel pump.

On older cars, this was easy... However since Nissan/Infiniti moved to a return-less fuel system it requires a special tool.

You can pay someone to do this, or buy a "fuel tap" and 60 or 100 PSI gauge.
This is the one I use: https://cj-motorsports.com/products/fuel-tap-npt-2-bolt.

What ever you decide to do, the fuel pressure should be 50-51 psi at idle.

Need to check the ohm reading of each coil pack when off of the car vs what the value is in the manual to correctly diagnose a bad unit.