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Engine idle speed

Tiny
ZEMORZEMOR
  • MEMBER
  • 2000 MAZDA PROTEGE
  • 1.6L
  • 4 CYL
  • 2WD
  • MANUAL
  • 180,000 MILES
The idle speed is at 850 with all accessories off. In the sticker underneath the hood it says it should be 700. What are the causes? I checked for vacuum leak, none.

Thank you
Wednesday, April 25th, 2018 AT 6:53 AM

3 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
May be a faulty idle control motor. Also, if the A/C is on the base idle will be elevated as well.
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Wednesday, April 25th, 2018 AT 7:12 AM
Tiny
ZEMORZEMOR
  • MEMBER
  • 486 POSTS
When the car was idling I unplug the IAC connector, no change at the rpm. So I guess the IAC is closed. The TPS was reading zero percent. My questions are, what the TPS should read at idle? The throttle body has two screws one on the spring loaded lever where the accelerator cable hooked too. And another one screw in the throttle body I think it restrict the air going in. Because that screw it like plug a bypass if I screw it in and allow air goes more when I do not. So do I need to adjust those screws?
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Thursday, April 26th, 2018 AT 8:41 PM
Tiny
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  • 486 POSTS
Okay, the first screw is called throttle body plate stop screw. The second is called idle adjustment screw. Forgot to tell you the idle went up after I cleaned the throttle body and for your information. I do not have AC.
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Thursday, April 26th, 2018 AT 9:16 PM

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