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Rough idle

Tiny
MARSHALL
  • MEMBER
  • 2004 MAZDA 6
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 130,000 MILES
Rough idle. Codes read Random Misfire on idle speed, lean on bank 1 and 2. Plugs, wires, coil new. Mass air sensor new, throttle body replaced has bout 50k on it, pulled O2s and cleaned them. Mazda said my 04 with a 2.3, car doesn't have a air idle control valve. No fix. Any thoughts?
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Friday, February 4th, 2011 AT 7:41 PM

2 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
For more info go to this link:https://www.2carpros.com/articles/engine-misfires-or-runs-rough
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Friday, February 4th, 2011 AT 7:43 PM
Tiny
MAZDA_TECH_TORONTO
  • MEMBER
  • 25 POSTS
Idle air control valve is built into the trottle body. Wascode p2187 p2188 p0300. Most times the pcm needs recalibrated with updated software. Other option could be the pcv hose and valve located behind the intake manifold. Check the maf sensor connector for broken wires. Also check for vacuum leaks. Intake manifold gaskets. Imrc solenoids on the top of the intake. Try these things out.
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Saturday, February 5th, 2011 AT 3:01 AM

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