What happens when IAC is stuck at idle?
An obstructed or stuck-shut IAC will result in a rich air-fuel ratio at idle, so the engine will start very easily while cold and then die suddenly after a slight puff of black tail-pipe smoke. A stuck-open IAC might start fine while warm and may continue to run if the engine reaches high-enough RPM.
What are the symptoms of a failing IAC valve?
Symptoms of a failing idle air control valve. Your check engine light is on: The computer monitors the IAC valve to make sure it’s working correctly. If something’s wrong, it will turn on the check engine light. 3. The car stalls: A faulty IAC valve can prevent the engine from getting enough air to idle properly. As a result, the car may stall.
Where is the IAC valve on an engine?
It accomplishes this by controlling the amount of air that gets around the throttle plate and enters the engine. Typically, the IAC valve is mounted on the throttle body, which is seen in the diagram. The engine’s computer controls the valve by sending voltage pulses to it.
How do you take O2 sensor out of Jeep Wrangler?
Took both sensors out, using the 7/8″ special socket and wrench. Downstream was tough, had to heat up exhaust pipe to get the sensor out. Pretty easy to get to them but limited space.
What happens if you have a bad IAC valve?
The engine will run fast even though you’re not moving. A bad IAC valve can also cause a surging condition at idle, where the RPMs will increase and then drop back to normal. 2. Your check engine light is on: The computer monitors the IAC valve to make sure it’s working correctly.
What was the problem with my 2002 Jeep Wrangler?
Start run, a little rough, but accelerating fine. After 10 of driving 2800 rpm problem returns. Code P0303 back. Drove the Jeep to the store in very cold temps. Ran rougher than before and got a new code P0135 02 Sensor error, P0300, P0304, P0303, P0305, P0306
How did we solve the 2002 Wrangler misfire problem?
2002 Wrangler Misfire problem solved!!!!!! Hey everyone! Enter your ride HERE to be a part of MAY’s Ride of the Month Challenge! All, there have been varying degrees of success solving the misfire problem from what I can see. Here are my notes on how we solved in my Wrangler. I have 2002 Wrangler Sport 4.0 stock engine with 141,000 miles.