engine starts with high rpm

2012 MAZDA 2
78,000 MILES • 1.4L • 4 CYL • FWD • MANUAL
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ADIRO
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Hi there, since last week or so, in the morning my car starts up with high rpm's 1500-1600, after one minute it drops down to 1000-1100 for few minutes and finally arrives at 800 rpm. I wonder what went wrong, there's no warning lights on?
Mar 18, 2016 at 7:27 PM
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CAR-MAN145
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This is controlled by the ECM the RPM is higher when colder and as it warms it goes down. If you think there is a problem then I would think it would be with the coolant temperature sensor, but if the idle goes down after a short time then I would think it is normal.
Mar 19, 2016 at 7:21 AM
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ADIRO
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as a new car it used to start up at 1000-1100 rpm shortly it dropped 700-800, now it is up to 1600 rpm and it takes much longer to reach the 800 rpm level, however you are right, I just noticed that coolant level is low, I'll bring it to correct level and see what happens. I will keep you informed. Thanks for your help.
Mar 19, 2016 at 9:27 AM
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STRAILER
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Did adding coolant help, do you have a coolant leak?
Mar 19, 2016 at 9:31 PM
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ADIRO
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it was a bit low, but not under minimum level
Mar 20, 2016 at 6:22 AM
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HMAC300
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try cleaning throttle plate on both sides with choke cleaner and look for a vacuum leak maybe
Mar 20, 2016 at 3:20 PM