Random Misfire. P0300
11-25-2011, 05:33 PM
#22
New Member
iTrader: (1)
Join Date: Aug 2007
Location: Cleburne, TX
Posts: 465
Likes: 0
Received 0 Likes
on
0 Posts
It's a bad fuel injector. It should be closing before the valve but it can't and the fuel it sprays bounces off the closed valve and blows up into the plenum and gets sucked in by the other cylinders. The engine senses the overly rich condition and thinks it's misfiring and throws a PO300. Pull all your spark plugs and inspect them one by one. Whichever is carbon fouled, that's your stuck injector, change it.
08-15-2016, 10:35 AM
#24
Registered User
Join Date: Aug 2016
Location: maryland
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
I have had a random misfire code for quite a while now> p0300. I have recently done all of the following.
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
05-07-2021, 01:43 PM
#25
I have had a random misfire code for quite a while now> p0300. I have recently done all of the following.
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
ever find out? Lolol needs to knowww
05-07-2021, 07:07 PM
#26
350Z/370Z Tech Moderator
MY350Z.COM
MY350Z.COM
This is the sixth time this week. People, check the dates of the posts you’re tempted to ask questions about. This post was the last time (likely their first and only time) they posted here.
Net net, don’t expect an answer.
Net net, don’t expect an answer.
05-07-2021, 07:10 PM
#27
I checked the date, taking a random stab. Don’t see the harm done bucko
05-07-2021, 07:14 PM
#28
350Z/370Z Tech Moderator
MY350Z.COM
MY350Z.COM
05-12-2022, 12:00 PM
#30
Registered User
Join Date: May 2022
Location: AL
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
I have had a random misfire code for quite a while now> p0300. I have recently done all of the following.
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
-New coil packs
-New spark plugs
-Replaced all 6 injectors
-Valve Cover gasket
-RTV the plug well seals to stop the oil from getting into cylinder
-Even did a new PCV just in case there was bad pressure.
Any other suggestions on what could be causing the problem? My car has full throttle up until about 4k RPM then falls on its face and literally does have any *** passed that> And running extremely rich.
2004 350z
i've been trying to fix the same exact issue on my friend's car
i've done:
6 new injectors
intake manifold gasket set
new MAF
knock sensor
knock sensor harness
crank sensor
6 new spark plugs
08-20-2023, 11:50 AM
#31
Registered User
Join Date: Aug 2023
Location: sacramento, CA
Posts: 1
Likes: 0
Received 0 Likes
on
0 Posts
Thread
Thread Starter
Forum
Replies
Last Post
AbyteZero
Engine, Drivetrain & Forced-Induction (DIY)
3
09-22-2015 09:17 AM
