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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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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.
 

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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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2016 Nissan Versa S (manual transmission)
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It still misfires. I hate this car....
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.
 

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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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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.
I have one other suggestion, but it is not free.
There are companies on ebay and for $100+/- they will test/fix your PCM/ECM and see if there could be anything wrong with the injector driver in the computer.
I've never used any of these companies, but since you have already poured a lot of money into the car, maybe another $100 to rule out the PCM/ECM may be worth the investment.
These companies can also VIN code a used PCM/ECM from a junkyard and you could swap in a different computer and see if the misfire still exists??
 

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There is still quite a bit that can be tested, bit at this point I'd recommend finding a local diagnostic tech to just tell you what it needs.

You really want to ignite everything you e done and follow the data where it leads, but it doesn't sound like you have the equipment to do this accurately, and it takes knowledge/experience to evaluate the data.

There is still injectors and compression that I didn't see mentioned. In theory I believe bad belt tension could cause the computer to think there is a misfire. How did you test for vacuum leaks?
 
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