idle problem on 2001 Honda CR-V

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when i first start the car it runs good
after the car starts to warm up
when i stop the car stalls
and atarts back up with no problem
after the car warms up the idle goes up and down
(1) Answer
(3) Comments
Vehicle Application: 1999 Honda CR-V EX 2.0L

Customer Concern: Low idle and stalling when cold.
Tests/Procedures: 1. This engine has had a lot of exhaust valve problems. The valves get tight and burn. To verify, perform a leak down test on the cylinder with the low compression.

2. Remove the valve cover and check the valve clearance. If the exhaust valve is burnt, then the cylinder head will need to be replaced or rebuilt.
Potential Causes: Exhaust Valves
Burnt Exhaust Valves

Tech Tips: Refer to Honda TSB #03-038.
Vehicle Application: 2001 Honda CR-V EX 2.0L

Customer Concern: The idle surges up and down when warm.
Tests/Procedures: 1. Verify that the warm base idle is set correctly, the base idle speed should be 480-530 RPM with a warm engine and the Idle Air Control (IAC) valve unplugged. If the base idle cannot be set, check for a vacuum leak and verify that the IAC valve is not sticking open slightly. Also cover the throttle body.

2. Check the fast idle valve on the bottom of the throttle body. When the coolant temperature is over 90 degrees, the fast idle valve should be closed and there should be no airflow on the 7 o'clock port in front of the throttle plates. Always verify that the coolant level and coolant flow to the fast idle valve.

3. Verify that the Engine Coolant Temperature (ECT) sensor is not reading warmer than actual engine temperature. If the ECM thinks that the engine is warm, it would not expect a high idle and the idle will surge.
Potential Causes: Incorrect Base Idle Speed
Insufficient Coolant Level
Engine Coolant Temperature (ECT) Sensor
Leaking Engine Vacuum
Fast Idle Valve
Insufficient Fast Idle Valve Coolant Flow

103450 miles just had valve job done last week
mec. worked on idle,changed idle, car stalls more then before change
after it drops from high idle
auto trans AWD
no check eng. light