I've never had P0300 come up on any of my vehicles but hopefully this will send you in new directions. Nissan Versa P0300: Engine Misfire Detected | Drivetrain Resource I know some models of the Versa had fuel regulator issues. If that's not the problem I'd try testing the cam/crank sensors and check the EGR system is operating properly. I would think that a cam/crank sensor and probably EGR problems would set other codes as well.
P0300 Random Misfire with no luck pinpointing it.
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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Thanks, I'll check out the fuel regulator and EGR system.
My first guess would have been a vacuum leak but if that were the case I'd think you'd also have other lean codes.
Have you tried changing out ignition coils? What shape were your plugs when they were replaced? If they had carbon build up, I would start with the coils. Just my .02
Edit: Additionally, what brand spark plugs did you purchase? Did you go oem or aftermarket?
Edit: Additionally, what brand spark plugs did you purchase? Did you go oem or aftermarket?
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.
Oh, i replaced the plugs with NGK Iridium plugs.
I think at this point I'd try to find out how to run a diagnostic on the cam/crank sensors. Often if the crank sensor is bad the engine won't start and run but that's often not the case with the cam sensor.
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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I had to replace the cam sensor on my '02 Ford Escort this summer. I had code P0340 which is a cam position code. There were several drivability issues poor fuel mileage, rough idle and often stalling when stopping at a stop sign/light or when hitting the gas to take off from a stop. After replacing CPS all the drivability issues were gone.
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.
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?
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?
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.
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.
Dang, I'm running out of suggestions. I'd go back and check the wiring harness going to #2 to be sure there's not problem there since that's the specific cylinder code it spit out. Might also want to move that coil to another cylinder to be sure the misfire doesn't move. If it does you got a bad coil. If I come up with any other ideas I'll post them. I know you said compression was good but was there any cylinder that was low enough that it might be caused by a bad head gasket and could possibly be the cause of the misfire? Or two side by side cylinders where the compression was lower and the gasket could be bad between those two?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.
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.
Doesn't look like the compression numbers vary enough that it should be having any impact. Bad head gasket was just a thought.
When you find the problem please post what the problem was so if anyone else runs into this problem they'll have an idea what to look for. Here's a thread where someone else was having a similar problem but they didn't post the solution to the problem. P302 Cylinder 2 Misfire, What Else Could it Be?
Will do, definitely!
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.
I would have never thought it would burn up aftermarket coils and pop the coil fuse within 20 miles.
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