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Engine has a high idle speed?

Tiny
SEMUJJU
  • MEMBER
  • 1998 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 210,883 MILES
Hello, I have the car listed above with 5a-fe engine. It has a high idle speed that's about 1,500 RPMs both when hot and cold. Tried replacing throttle body, ECU but still the problem remains, what could be the issue? Thanks
Sunday, January 21st, 2024 AT 5:43 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
When you say throttle body did you replace the IAC motor? Toyotas had a problem with this part. please watch this video to show you and I have included a guide and the location of the IAC for your car in the images below.

https://youtu.be/XMB16Gg-qNg?si=jjuqHXl7dFHJa6R7

and

https://www.2carpros.com/articles/engine-idles-too-high

Also, please disconnect the throttle cable to see if the problem goes away which means the cable is too tight. Check out the images (below). Please upload pictures or videos in your response to the problem so we can see what's going on.

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Sunday, January 21st, 2024 AT 11:40 AM
Tiny
SEMUJJU
  • MEMBER
  • 2 POSTS
I have disconnected the cable but still the problem remains.
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Monday, January 22nd, 2024 AT 10:34 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,643 POSTS
Did you change out or clean the IAC unit? Did you watch the video?
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Tuesday, January 23rd, 2024 AT 10:03 AM

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