1999 q45, has very steady idle at col start, once engine warms up, its not rough, but can feel multiple missfire

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Asked by Jun 14, 2013 at 11:44 PM about the 1999 INFINITI Q45 4 Dr STD Sedan

Question type: Shopping & Pricing

does not feel like it wants to shut off, its not rough and has no problem at acceleration, but u can hear the missfire at the tailpipe and can feel the miss every time it misses

6 Answers

the ambient sensor what tells the ECU sees only a cold condition as the motor warms starts chokin with incorrect air/fuel ratio~

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i dont smell raw fuel, it is a slight missfire, like it shuts off a cylinder for an instance and back on, but constant on both banks

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no not RAW fuel...an uncomfortable air/fuel ratio which will foul plugs and run black~ perhaps it is an air temperature sensor---will not know until we have your diagnostic trouble codes read...get them at any autoparts store or get your very own OBD-II coder reader~

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THE CODES THAT I GOT BEFORE CLEARING THEM WERE KNOCK SENSOR BANK 2 AND HEATER SENSOR BANK 2, CLEARED THE CODES, REPLACED ALL SPARK PLUGS, REPLACED RAFDIATOR CAUSE IT WAS LEAKING, STARTED VEHICLE AND HAS THE EXACT SYMPTOMS BEFORE DOING THE PARTS REPLACEMENT, CHECK ENGINE HAS NOT COME ON YET, AND NEVER GOT ONE FOR RANDOM MISSFIRE

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You've already replaced the last 02 sensor on the exhaust pipe?

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no, i have not, now im getting random missfire with code reader

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