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High engine idle?

Tiny
KHURRAMNCP
  • MEMBER
  • 2004 TOYOTA COROLLA
  • 1.3L
  • 4 CYL
  • 2WD
  • MANUAL
  • 600,000 MILES
In the morning the RPM goes to 1500 at startup and then slowly decreases to 900. The engine vibrates a lot in idle mode. New throttle body has been installed but no improvement. Sometimes engine is not is not started in first attempt.
Sunday, October 16th, 2022 AT 8:02 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,702 POSTS
This sounds like a classic vacuum leak. Please check for leaks by following this guide when the engine is cold:

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Also, this guide may help as well:

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

Please go over these guides and report back.
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Monday, October 17th, 2022 AT 9:58 AM

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