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Engine starts with high RPM

Tiny
ADIRO
  • MEMBER
  • 2012 MAZDA 2
  • 1.4L
  • 4 CYL
  • FWD
  • MANUAL
  • 78,000 MILES
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?
Friday, March 18th, 2016 AT 7:27 PM

5 Replies

Tiny
CAR-MAN145
  • MECHANIC
  • 321 POSTS
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.
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Saturday, March 19th, 2016 AT 7:21 AM
Tiny
ADIRO
  • MEMBER
  • 3 POSTS
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.
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Saturday, March 19th, 2016 AT 9:27 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Did adding coolant help, do you have a coolant leak?
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Saturday, March 19th, 2016 AT 9:31 PM
Tiny
ADIRO
  • MEMBER
  • 3 POSTS
It was a bit low, but not under minimum level
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Sunday, March 20th, 2016 AT 6:22 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides with choke cleaner and look for a vacuum leak maybe
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Sunday, March 20th, 2016 AT 3:20 PM

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