1995 Honda Civic Idle Surging

HONDA CIVIC
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SKADALOZ
  • MEMBER
  • 3 POSTS
when i start up my 95 civic ex the idle jumps up and down from 1000-2000 rpm on cold start...and on warm start it jumps from 1000-1500...so i dont know whats wrong with it
Apr 26, 2006 at 2:24 PM
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BRUCE HUNT
  • ✓Experienced Mechanic
  • 3,754 POSTS
I call this surging and there are a number of issues that can cause it. If it happens all the time, would suspect the throttle body's IAC valve or a sticking air flow sensor. Another cause is the coolant level is too low or has air in the system. Try bleeding the system at the two bleeders. Is there a check engine light on? Gently tap the sensor that is located directly across from the throttle linkage. That is the air flow sensor. The IAC valve is located on the throttle body and could be taken off and cleaned. Coolant runs throught this rascal.
Apr 28, 2006 at 6:24 AM

Suggested Repair

Bleed air from the cooling system at both bleeders and confirm the coolant level. Clean the IAC valve on the throttle body, check for a check engine light, and test the airflow sensor across from the throttle linkage by gently tapping it.

Conversation Summary

The owner of a 1995 Honda Civic EX reports idle surging from about 1000-2000 rpm on cold starts and 1000-1500 rpm when warm. The expert attributes the surging to a possible IAC valve problem, a sticking airflow sensor, or low coolant or air in the cooling system, and recommends bleeding the system, checking for a check engine light, tapping the airflow sensor, and cleaning the IAC valve.

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