IAC Valve Problems?

Answer An idle air control (IAC) motor adjusts the engine's idle speed, or RPM, by opening or closing an air bypass valve located in the throttle body. IAC valve problems can develop for many reasons, but... Read More »

Top Q&A For: IAC Valve Problems

Problems With a Bad PCV Valve?

The PCV (Positive Crankcase Ventilation) valve is part of a vehicle's emission control system. The standard PCV valve controls the recirculation of the unburned gases and fresh air. The valve conne... Read More »

How to Troubleshoot PCV Valve Problems?

The Positive Crankcase Ventilation (PCV) valve on your vehicle allows gasses that escape from the combustion chamber to be recirculated and burned again instead of being released to the atmosphere.... Read More »

Ford 4.6 EGR Valve Problems?

The Ford 4.6-liter engine has been used in a variety of Ford, Lincoln and Mercury models since 1991. All versions are equipped with an exhaust gas recirculation (EGR) system to improve vehicle emis... Read More »

Exhaust Valve Problems?

Inside a vehicle's engine houses a myriad of intricately moving parts to propel the car forward. Parts, such as exhaust valves, play a key role in the functioning of the engine's cylinder assemblies.