350z Misfire! Nothings working.
#1
New Member
Thread Starter
350z Misfire! Nothings working.
I have a 350z 6MT and it is currently throwing a P0300 (Random/Multiple Misfire). I did many things and I cant seem to find the problem. It was recently engine swapped because the old one spun a bearing at 140k. I swapped a G35 ( VQ35DE ) engine in and it was missing. I changed the plugs, the coilpacks, crankshaft position sensor, camshaft position sensor ( driver and passenger side ), changed fuel rail and injectors, changed ignition coil sub harness. I have no idea what to do. Any advice?
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350zRomano (01-18-2018)
#3
New Member
Thread Starter
No injectors are good, yes plugs are good, everything was installed correctly, no motor wasnt damaged and did a compression test it was all good aswell. And yes did a vacuum leak test. Im thinking maybe a wiring issue im hoping not
#4
350Z-holic
iTrader: (13)
are you 10,000% sure you didnt swap coil plug #6 and #4? They are inherently/logically backwards?
Take a picture of your driver side bank and post it.
Take a picture of your driver side bank and post it.
Last edited by bealljk; 01-13-2018 at 09:49 AM.
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350zRomano (01-18-2018),
Cux350z (01-13-2018)
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350zRomano (01-18-2018)
#6
350Z-holic
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I know I'm bat-**** crazy ...
Last edited by bealljk; 01-13-2018 at 11:35 PM.
The following 2 users liked this post by bealljk:
350zRomano (01-17-2018),
BluestreamDE (01-14-2018)
#7
350Z/370Z Tech Moderator
MY350Z.COM
MY350Z.COM
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350zRomano (01-17-2018)
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#8
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Thread Starter
thank you my man i appreciate that picture but im almost sure i have them correctly plugged but i will check. Im starting to think its going to come down to a grounding issue.
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350zRomano (01-17-2018)
#10
New Member
Thread Starter
thanks for all advice. I have not yet got to work on my car due to snowy freezing weather which is effecting me because i also have a fan issue so its hard to ru up the car because it is too loud and too cold. I would appreciate if you guys have more details on grounding wires. The FSM doesnt give too much about them and it is kind of difficult to find them all especially the ones related to my issue.
#11
New Member
I don't know what you're talking about. Section PG of the FSM has all the info on ground points you could ever need.
#13
New Member
Okay, so SPECIFICALLY, which grounding points are you trying to find, assuming you can't get your hands on a wiring diagram?
#14
New Member
Thread Starter
Solved !
Hey fellas, i worked on her yesterday and the first thing i checked was the plugs ( #4 and #6 ) and of course they were swapped!! So angry at myself for not doing this first and not checking this before i did all those other things but atrleast now I know my car is in fantastic shape. It has stopped throwing the code and it is running like a beauty. Thank you for all your advice !!! Drift safe my fellow Z members
#15
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