As far as most electronic parts on our Z’s I always recommend installing the Genuine Nissan OEM parts as they work best on Nissan/Infiniti vehicles. It’s your car you can try it if you want. The VVT solenoid is very important if you find that it is faulty or has build up and/or blockage in it definitely replace it.

Well for the now the problem is fixed. I swapped out the VVT cleared the codes and ran it through the gears and hit 3500+. No longer in limp mode, both codes have yet to come back, and the ruff/weird idle is gone. For now...

Still concerned with the buildup just below the VVT case cover, on the coolant hose attachment. Hopeing it's from the VVT or gasket I just replaced.

If **** happens I'll update.

So check you're VVT if you get a P0300 +/- P0021 codes.

~Small Update~
Drove it around for a little yesterday, a little spirited driving included, everything is holding up so far. My theory is it that possibly due to the cold oil and overall temp on an old part, the sudden increase in pressure caused it to fail.

Genosphere thanks for the pictures and update. I've been chasing this problem for a long time. I will take a look at that.:bowrofl:

No problem bud.

By the way as an update, its been how ever long since i did the fix and so far everything holding strong!

Side note,
Ill be making new discussion, soon, on a build i have been doing for cosmetics and upgrades, exterior (front/rear bumper) and interior (wrapping/swapping bits and pieces). Also doing a a dip paint job in HKS purple.

If anything changes or a similar code pops back up ill update.

Good luck to all who are chasing this gremlin!
:tiphat:

My 370Z
 

[IMG]http://https://1drv.ms/u/s!AslbSZfglHIahRja0VDYteiWtt31

This is what I found , looking for the P0300 code in my car , the coil is ok but there is the dammed fuse between the coil and the plug already blown , now there's no more P0300 code in my car . First of all I need to buy a new coil assembly and start removing coil by coil and installing the new one until I found the damaged one , for my surprised there is the fuse in the middle of the assy, no one of my friends and I known about the fuse in that place .
I hope this info can help in the solution of the infamous P0300 code .:driving:

http://prhobby@caribe.net

http://https://1drv.ms/u/s!AslbSZfglHIahRja0VDYteiWtt31
http://https://1drv.ms/u/s!AslbSZfglHIahRqBDLisdAv_KTT_

People , looking for the solution to the problem caused by the code P0300, I came across this. None of my friends knew there was a fuse between coil and plug. I found myself in need of buying a replacement coil so that I would remove coil by coil until I found the faulty one, but it was a surprise to me to found a fuse between the coil and the plug. I hope this information will help others who have the same problem as me. Since the coil is OK , my scanner don’t say anything about the cylinder number ( supposed P0301 }

Usually happens to me in the cold weather and goes away when it warms up. Common problem with intakes.