P0300 error on y62

[anonymouse59]

recently bought a 2011 Y62 and its got this really frustrating p0300 misfire that occurs oly on gasoline regardless of a disabled lpg system that suggests potential electrical issues. I tried swapping the coils, replaced plugs and some other extreme efforts and discussions at a Nissan dealership including VVEL adjustments. also replaced the timing chain of it, and some other repairs ALL to no avail. I guess im running out of luck on this one. the misfire is mainly on cylinders 1 and 8, goes back accompanied by fuel trim spikes and failed obd tests. WIggling wires often helps, it hints electrical problems. im now only left with 3 engine modes, misfiring, slight vibrations and smooth running with no clear cause. honestly im exhausted by thinking of ways on how to resolve everything especially when im running out of juice to spend. a little help?

 

[8BitAlchemist88]

yo, sounds like a nightmare. did u check the fuel injectors? sometimes they get clogged. also, maybe look at the crankshaft position sensor. had a similar prob once, turned out to be that. good luck!

 

[iamtheonewhoknocks]

Hi! I'm not technical really so I just did a quick search for you. I think it's related to the wiring connected to the ignition system or fuel injectors for cylinders 1 and 8, which are the ones doing the misfires at the moment you said. Bring it to the dealerrr. It's not something you can do much on your own if you're not really knowledgeable about the electrical shiz. I suggest you check preliminary and see if there's some wear and tear in the wiring harness. Next don't touch anything and let the dealer handle it.

 

[the_aristocrat]

look dear, if wiggling wires changes things, you've got a wiring or connector issue, plain and simple. I'd stop chasing parts and start tracing the harness, especially around coil grounds and ECU plugs cos it sounds like a brittle wire or broken pin. Burnt out yet, but you're close, just dig into the loom already i guess

disclaimer...I could just be wrong too

 

[f.n8ty]

recently bought a 2011 Y62 and its got this really frustrating p0300 misfire that occurs oly on gasoline regardless of a disabled lpg system that suggests potential electrical issues. I tried swapping the coils, replaced plugs and some other extreme efforts and discussions at a Nissan dealership including VVEL adjustments. also replaced the timing chain of it, and some other repairs ALL to no avail. I guess im running out of luck on this one. the misfire is mainly on cylinders 1 and 8, goes back accompanied by fuel trim spikes and failed obd tests. WIggling wires often helps, it hints electrical problems. im now only left with 3 engine modes, misfiring, slight vibrations and smooth running with no clear cause. honestly im exhausted by thinking of ways on how to resolve everything especially when im running out of juice to spend. a little help?

Have you sorted this one out?
With all the symptoms you mentioned, even the fuel trim spikes, it points out to an electrical issue.
What you have to check are hidden wire breaks, chafing, corroded or loose connectors.
Dielectric grease on connectors might be able to help!
An oscilloscope can be handy so you can see signal drops to the misfiring cylinders when you wiggle the wires!