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How do I fix misfiring

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My car is sputtering on acceleration and even on idle.  P0300 code per computer controller. 

2016 Nissan Versa Note.. 4cyl

Tune up was done a few months ago..  Spark plugs, wires , etc..

Catalytic converter replaced recently and then P0300 starting to present.  Vacuum seals on intake manifold? Any other possibilities? Fuel Pump or Filter maybe?

 

Thanks!

 

Jeff

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6 Answers
4
Posted by: @jsnow1970

If it is a distributer cap or vacuum seal would there be another more specific code thrown back?

There is no distributor cap in your vehicle. There's also no wires. A 2016 Nissan certainly has coils on plugs. 

 

Live Data is key to diagnosing a misfire. It can be as simple as a detached vacuum hose to as complicated as a blown head gasket, bad piston rings, worn out timing chain or really anything of that sort (the likelihood of those are very slim, especially if you don't really notice much being "off" when it runs). You really need live data to diagnose this. Lean and rich running mixtures cause misfires, which can be caused by dirty air filters and fuel filters. The fuel /air mixture isn't igniting and burning like the computer is expecting.

 

You said it was tuned up recently-check that the plugs haven't loosened up. I noticed my '79 Catalina randomly started running weird a year ago and I smelled fuel under the hood. All I needed to do was re-tighten the plugs. Two had worked themselves loose. 

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Alot of things can cause a misfire, lack of fuel, bad data to the computer such as a faulty MAF, corrosion on a coil, headgasket. Are you losing coolant, and do you have anyway to look at some live data?

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Topic starter

I double-checked the download at Advanced Auto,  The p0300 is the only code being pulled. No other codes specifically pointing to another issue.  No leaks that I can detect.  I cannot look at live data since I don't have the equipment.  When the catalytic converter was replaced it was pretty much a wreck. Pieces jangling inside when he shook it.  Don't think that is supposed to happen. If it is a distributer cap or vacuum seal would there be another more specific code thrown back?

 

 

one thing you can do to start, is check each coil while the car is running, other things may include bad injectors. also catalytic converter is part of the exhaust, even if it's bad, it's just an outlet, if something is bad, it has to be within your engine's block.

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Posted by: @jsnow1970

catalytic converter was replaced it was pretty much a wreck.

engine has probably been misfiring for some time. See the FAQ for troubleshooting tests.

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Probably a bad coil.  There are no plug wires.

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Posted by: @jsnow1970

I cannot look at live data since I don't have the equipment. 

All it takes is a $50 scan tool. Check the FAQ for recommendations.

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