1997 Acura CL hunting idle?

  • 1997 ACURA CL
  • 6 CYL
  • FWD
  • 22,209 MILES
I just replaced my 3.0engine in this acura motor runs great except for a hunting idle between 1500 and 3000 rpm and idles at 1300 and is supposed to be 750? Ive changed all the sensors no vacuum leaks? Im lost any help?
Do you
have the same problem?
Monday, September 22nd, 2008 AT 3:17 PM

1 Reply

Hello, has it thrown any codes? You might try this


The table shows symptoms and probable causes for problems that DO NOT cause the Malfunction indicator Lamp (MIL) to come on. If the MIL was reported on, Troubleshoot each probable cause in the order listed (from left to right) until the symptom is eliminated. The probable cause and troubleshooting references can be found it the table.

Other Probable Causes for an engine that will not start:

Intake air leakage
Engine locked up
Timing belt
Starting system


Adjust the idle speed using a Honda PGM Tester if possible. If not, use the following procedure:


Leave the IAC valve connected.
Before setting the idle speed, check the following items:
The MIL has not been reported on.
Ignition timing
Spark plugs
Air cleaner
PCV system
Disconnect the EVAP purge control solenoid valve 2P connector.


Connect a tachometer.
Start the engine. Hold the engine at 3,000 rpm with no load (Park or neutral) until the radiator fan comes on, then let it idle.
Check the idle speed with no-load conditions: headlights, blower fan, rear defogger, radiator fan, and air conditioner are not operating. Idle speed should be: 750 50 rpm (in Park or neutral)


Adjust the idle speed, if necessary, by removing the cap and turning the idle adjusting screw 1/4-turn clockwise or counterclockwise.
After turning the idle adjusting screw 1/4-turn, check the idle speed again. If it is out of spec, turn the idle adjusting screw 1/4-turn again. NOTE: Do not turn the idle adjusting screw more than 1/4-turn without checking the idle speed.
Let the engine idle for one minute with the heater fan switch at HI and air conditioner on, then check the idle speed. Idle speed should be: 750 50 rpm (in Park or neutral) NOTE:
Do not turn the idle adjusting screw when the air conditioner is on.
Reconnect the EVAP purge control solenoid valve 2P connector.
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Saturday, October 11th, 2008 AT 12:40 AM

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