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02 Infiniti I-35 P0303 Rough Idle


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i35
New User

Jan 24, 2018, 6:35 PM

Post #1 of 7 (352 views)
  post locked   02 Infiniti I-35 P0303 Rough Idle  

A year ago my car would always Idle rough when low on gas. The problem always went away by restarting the car. This time around nothing stops the poor idle, and I get a code for misfire in Cyl 3.
Although the plugs and coils have not been changed, I believe this is actually the fuel injector due to the history of this same rough Idle. Any suggestions?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 24, 2018, 6:42 PM

Post #2 of 7 (348 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  

Yes, I have a couple of suggestions

Stop running you car low on fuel or you will be buying a new fuel pump

Don't ignore the ignition that should have been replaced before trying to look beyond for other problems.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Discretesignals
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Jan 24, 2018, 6:54 PM

Post #3 of 7 (337 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  

You need to figure out what is causing cylinder number 3 to misfire. Is it no spark, no fuel, a mechanical problem, or a vacuum leak causing that cylinder to not contribute? You'll have to do some diagnosis instead of guessing if you don't want to waste time and money just throwing parts at it.





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(This post was edited by Discretesignals on Jan 24, 2018, 6:56 PM)


i35
New User

Jan 25, 2018, 6:27 PM

Post #4 of 7 (302 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  

ok


(This post was edited by i35 on Jan 25, 2018, 6:28 PM)


i35
New User

Jan 25, 2018, 6:28 PM

Post #5 of 7 (298 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  


In Reply To
Yes, I have a couple of suggestions

Stop running you car low on fuel or you will be buying a new fuel pump

Don't ignore the ignition that should have been replaced before trying to look beyond for other problems.


Your false assumptions and suggestions are very unhelpful. you could have just ignored this post, but I guess you have extra time on your hands. Unsure


i35
New User

Jan 25, 2018, 6:35 PM

Post #6 of 7 (296 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  


In Reply To
You need to figure out what is causing cylinder number 3 to misfire. Is it no spark, no fuel, a mechanical problem, or a vacuum leak causing that cylinder to not contribute? You'll have to do some diagnosis instead of guessing if you don't want to waste time and money just throwing parts at it.

Im not guessing, Im diagnosing based on the problems it has, and had leading up to this. Ive deleted the code several times but the same code comes back up immediately. From what Ive experienced it usually a vaccum problem when its a random misfire, not specific. Therefor it has to be the plugs/coil, or fuel delivery. I may just change the plugs coils , and injectors


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jan 25, 2018, 6:44 PM

Post #7 of 7 (292 views)
  post locked   Re: 02 Infiniti I-35 P0303 Rough Idle  

Great idea. Doesn't sound like you need us.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







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