Question about 2003 Mazda Mazda6

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I have a 2003 Mazda 6. Sometimes while its in park or I have stopped at a red light the engine dies. Yesterday the rpm needle dropped almost to zero and the car reved up on its own. When listening to the motor run it seems as if is missing from time to time.

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Check the Iac sensor

Posted on Jul 22, 2009

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The car hesitates when idling or stopped at light/ stop sign, and the rpm drops to zero then goes back up.


The battery was a red herring - it would not have anything to do with the problem.
Faulty spark plugs could cause a miss but probably not make the engine stall.
What you described is a classic example of a faulty idle air control valve or a dirty throttle body. The computer controls idle speed by regulating how much air enters the intake. It opens the control valve to raise idle speed when necessary.
I would check the control valve and the throttle body.

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1 Answer

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Hi! The MAF (mass air flow) sensor is surely faulty. The MAF has big contribution on the engine performance specially on the idling an vacuum supply. If the MAF is faulty the rpm will drop eratically or die. Regarding the overheating problem, you may want to check the radiator blower for it may be tripping that sometimes it works and sometimes won't. This can be a good cause. Hope this helps and thank you for using FixYa!

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