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Discussion Starter · #1 ·
Hello, first post, great info on here. I have a 2016 Versa Note with a P0300 code and running horrible. I replaced plugs, crank sensor, battery, made sure it had good fuel, replaced the intake gaskets, couldn't find any vacuum leaks, compression is good. What might i be missing? If i understand things correct, if it is a bad coil or fuel injector I should get a specific cylinder misfire and not a random code correct? Could a failing fuel pump be the problem?
 

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Discussion Starter · #6 ·
Well, I replaced the fuel pump, which has the regulator pump and filter in one unit. I thought it was fixed, ran great for about 30 miles, then started missing again. I'll have to check out the EGR system. Hopefully that is the problem.
 

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Discussion Starter · #9 ·
I think that may be my next move. I have already replaced the crank sensor, and that’s the hard one. I have tried to find info on the EGR, but it seems these don’t have one. Maybe the PCV system?
 

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Discussion Starter · #12 ·
Well, replaced the cam sensor and all the coils just in case. Took it for a drive and thought it might actually be fixed, ran great! then about five miles later I got a check engine light with a P0300 and P0302. Then about a mile later it died and wouldn’t restart. Im about to give up.
 

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Discussion Starter · #14 ·
Typically people don’t work on their own cars to save the trouble. I might think about taking it in if I knew of a reputable shop. Heck, I had a coolant leak on my truck that I took in recently. I figured the dealer should know what they are doing. But they literally threw parts at it trying to find the problem. It was in and out of the shop for over a month. Total bill for what ended up being an oil cooler was over $3500. They ended up replacing the hoses, water pump, 3 way coolant valve, and egr cooler before finding out the coolant was leaking into the crankcase.
But I enjoy working on them. And under normal circumstances, I can narrow a problem down to a few things. If I can replace them both for the cost of a shop replacing one, then I’m ahead. I also received the knowledge from the experience.
 

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Discussion Starter · #16 ·
Thanks for the suggestions, I appreciate it. I’m going to yank the intake off today and replace the new coil with the old one and double check the wiring. Compression was 172-165-168-175.
 

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Discussion Starter · #20 ·
Well, had it towed to to the local shop, they couldn’t figure it out but they thought it was the computer. Charged me $150 and said it would need to go to the dealer because they can’t program the computer. Had it towed an hour to the nearest dealer. They said the Nissan’s do not like any aftermarket coils. I told them to go ahead if they thought it would fix it. Sure enough $1500 later and it’s running great again.
I would have never thought it would burn up aftermarket coils and pop the coil fuse within 20 miles.
 

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Discussion Starter · #21 ·
Well long needed update. So about 4 months after the coils, it starts missing again, back to the shop it goes, figured one of the coils went bad again, $2000 dollars later they said the MAF sensor needed replaced and the 4 month old spark plugs. Ran ok for about 2 weeks then started missing again. I heard a funny rattle in the exhaust so I yanked it off. Looks like the misfires took out my cat and shot the particles into the muffler. I was hoping the particles plugged the exhaust a bit to cause the miss so I Hollowed out the cat to test out my theory and put on a new muffler. Still misses. Back to the dealer it goes…. I hate this car…
 

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Discussion Starter · #22 ·
I am very sorry that your Versa gives you so much trouble, where you spent a lot of time and replaced a bunch of parts. Not to mention a lot of frustration.

Now, looking back, do you think it would be less trouble to bring your car in the first place to the reliable shop, where they do a proper diagnostic before they change parts, and attempt to fix it right the first time? Do you think even with their fees it still would be less expensive than the amount you already spent?
As it sits right now, definitely not, it seems the reliable shop is throwing much more expensive parts at it with no fix yet. I think I’m $3200 in at the dealer and I’m not any closer to finding the problem.
 

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Discussion Starter · #24 ·
Sounds like it was just a bad coil. The car doesn't know what kind is on there.

Now cross's your fingers and hope that p0420 doesn't pop up soon from the misfire!

For future readers, these don't have egr valves. The same effect is achieved with variable valve timing.
Actually, I still have not found the problem. So far I have replaced, the cam sensors, crank sensors, coils twice, spark plugs twice, intake gaskets twice, MAF sensor, fuel pump, fuel filter, hollowed out the cat (because it had melted from the misfire), the muffler, and had the fuel system professionally cleaned.

It still misfires. I hate this car....
 

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Discussion Starter · #26 ·
This is a little out there, but is there any chance a rodent chewed on any of the wiring and something is shorting out - occasionally. Can you do a visual inspection of your wiring??

The reason I bring this up is... my neighbor had a large truck that was his tow rig for his camper. Mice or rats or some type of rodent made a meal out of some injector wiring, sometimes the wires would short out (going around a turn, hitting a bump, etc.) other times the current flowed, as the wires weren't grounding out.

I found the chewed area doing a quick visual inspection. As a test, I put liquid electrical tape on the exposed wire. Reset the ECM and had him drive it.. no more misfires. So he ordered up a new wiring harness as a permanent fix.
Thats a good thought, I never saw any chewed wires, but that doesnt mean there may be some wires that wore through the insulation. I'll have to chase the wiring harness and see if i find anything.
 
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