You may also want to replace the Crankcase Vent Valve as it can also fill up with oil and carbon and replacement can be done at the same time as the ICV.Īdd a new Bosch ICV to your M50 Manifold Upgrade to save time and money! There is also a hard rubber seal between the ICV and the manifold and this should be replaced as well. It can be cleaned with carb cleaner but for seriously dirty or old ICVs you may want to replace the whole unit with a new one. The ICV will typically need to be cleaned or replaced every 100k miles. Worst case, the electric motor inside will freeze which will stall the engine. Over time, the ICV can become gummed up with oil and carbon, resulting in slow or blocked operation. The ICV is basically a electrically-driven throttle body that regulates the air/fuel mixture at light throttle openings. The idle control valve is one of the areas that you can check to fix these issues.
Rough or hunting idle? Stalling? Sputtering? These are all symptoms of poor fuel delivery or a vacuum leak in your intake system.
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