2003 NISSAN MAXIMA RANDOM MISFIRE

  • Tiny
  • Bilgerat710
  • 2003 Nissan Maxima
  • 130,000 miles

At random my car will misfire and through a p300. I have sent all the injectors in to be checked. They checkout great. I replaced all the coils. All cats were replaced. I replaced the crank sensor. I also replaced the fuel pump and filter. I also put an 2004 rear valve cover on to fix th 2003 oil leak. When the car is running fine the output voltage is 14.1-14.0. When it is running rough it drops down to 13.7-13.6. The mass air flow sensor is also new. Running out of options.

Monday, June 17th, 2013 AT 6:23 PM

3 Answers

  • Tiny
  • hmac300
  • Expert
  • 41,713 posts

As this can be many things that cause this have a pro scan it so he can narrow things down.

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Tuesday, June 18th, 2013 AT 5:57 AM
  • Tiny
  • Bilgerat710
  • Member

I have scanned and reviewed all live data. Everything is within spec both when it is running rough or smooth.

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Sunday, June 23rd, 2013 AT 6:19 PM
  • Tiny
  • hmac300
  • Expert
  • 41,713 posts

If you don't have a pro type scanner it won't pick up what needs to be. Your maf can be bad as well as low compression on cylinder, a lean injector etc. If you have an auto parts type scanner it can't read a lot of that stuff. Fuel pressure must be within spec as well and check all grommets for air leaks.

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Monday, June 24th, 2013 AT 6:50 AM

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