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High RPM after starting the car

Tiny
CHARMANDER
  • MEMBER
  • 1997 MAZDA 323
  • 250,000 MILES
I have an automatic, 1997 Mazda 323. It would start fine however, the rpm would go up to 2500 and will stay there for a while. When I shift the gear to Reverse or Drive Mode, rpm would go down to normal. However, when I shift it back to Neutral or Park mode, the rpm would again go up to 2500. It will stay on that state for several minutes but once I drive it off and the engine warms up, it gradually lowers the RPM to about? 750 RPM. It's quite alarming since I think this would make the car use up more fuel. Hope you could help. Thanks in advance.


I had the alternator, ignition coil and cerbo kit checked, and according to the mechanic, there's nothing wrong with them. Also, the ignition and cerbo were cleaned.

Please help. Thanks
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Sunday, May 20th, 2012 AT 6:47 AM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Did they scan for codes and check for vacuum leaks?
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Sunday, May 20th, 2012 AT 6:57 AM
Tiny
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  • 2 POSTS
Not yet. May I asked how do you scan for codes?
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Sunday, May 20th, 2012 AT 7:31 AM
Tiny
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  • MECHANIC
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You require a scanner that plugs into the OBD11 access port, all mechanics can do this and some larger parts retailers will do this as a free service I understand.
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Sunday, May 20th, 2012 AT 7:48 AM
Tiny
RASMATAZ
  • MECHANIC
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If you're located in the US within the 48th States-Go to Autozone or Advance Auto and have it scanned there-you'll also know where to hook-up your scantool to the OBD2 DLC in the future
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Sunday, May 20th, 2012 AT 8:36 AM

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