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Mazda Millenia

Why does the car hesitate or power down when accelerating with a cold engine?


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2011-09-14 00:07:51
2011-09-14 00:07:51

If I remember right there is a technical service bulletin about water getting into the ecm. If I am right he may find the computer either full of water or if you live in a climate that has freezing weather, the case may even be cracked. In the past we have been able to perform the recommended repair according to the tsb sucessfully, in some cases had to replace the ecm. Unfortunatley this question was moved from the Old FAQ, and pertinent information is now missing. This particular answer related to a particular car that is no longer mentioned.

AnswerYour o2 sensor may be bad. AnswerOr your EGR valve/sensor.


If its a EFI motor it is more then likely dirty fuel injectors, they just can't get enough fuel through them when its cold. Compare it to a older carby car that didn't have enough choke..

Usually the computer will not look at the O2 sensor when the motor is cold.


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The computer turns the AC clutch off when accelerating for maximum engine power. The AC compressor uses up some engine horse power.

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all engines hesitate when cold they need to get to proper running temp

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Most likely needs a tuneup done. Check the timing and change the normal tuneup part.

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No, it does not loose power but when the engine is cold, it is just harder to turn over.

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