Sub-EGR Valve
- Check to make sure that when the sub EGR valve is pulled by hand, it moves smoothly. If the valve is hard to move, remove and check it for carbon, dust and other deposits. If necessary, clean with a solvent and apply oil sparingly.
- If still hard to move, replace the sub EGR valve. When the sub EGR valve can not be moved easily, spray with a solvent several times from the outside with the rubber boot removed. Turn the valve and remove it.