I HAVE JUST BOUGHT THIS Q45

  • Tiny
  • /209JOHN\
  • 2002 Infiniti Q45
  • 230,000 miles

I have just bought this Q45. It runs great on the fwy. However, acceleration from a start is not smooth. I have a smell of fuel or exhaust from the manifold area. I have a scanner and pulled 3 engine codes.

Here's the codes:

1. P0306 - Cylinder 6 Misfire Detected ( could it be a coil or fouled plug? )

2. P0330 - Sensor 2 Ckt Malfunction Bank 2 ( what should I do? Replace the knock sensor? What is the term "Ckt"? )

3. P0505 - Idle Control System Malfunction ( Should I inspect and clean the throttle body with a spray? )

Thanks in advance.

Monday, December 24th, 2012 AT 8:29 PM

5 Answers

  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

Do you have a constant miss fire at idle?

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Monday, December 24th, 2012 AT 8:57 PM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

I would try cleaning the idle air control valve. But let's hold off on the knock code till we fix the miss fire code code be setting the knock code.

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Monday, December 24th, 2012 AT 9:00 PM
  • Tiny
  • Docfixit
  • Expert
  • 18,991 posts

1. Yes also injector pull plug take a look maybe fouled
2. Maybe open or short in circuit[CKT] or knock sensor
3. Either faulty throttle actuator or intake leak
Would start with plug inspect then erase codes drive see what resets

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Monday, December 24th, 2012 AT 9:04 PM
  • Tiny
  • /209JOHN\
  • Member

Here's an update: Today I took off my intake and cleaned my "MAF SENSOR" with CRC maf cleaner.

Also, I bought "sea foam" throttle body cleaner and sprayed and wiped the throttle plate.

I cleared the codes and test drove it.

CEL came back on again. This time one 1 code though. It was "P0505" Idle control malfunction. ( IAC VALVE. Should I replace it? )

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Tuesday, December 25th, 2012 AT 4:04 AM
  • Tiny
  • saturntech9
  • Expert
  • 28,434 posts

The first thing you need to do is see if you have a vaccuum leak?

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Tuesday, December 25th, 2012 AT 10:31 PM

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