Thorough cleaning of the Intake Manifold itself, the EGR Valve and Intake Pipes should be done every 50,000km. Oil vapours on Diesel engines are introduced into the intake system by a breather hose that vents the crankcase next to the oil fill cap to meet emissions standards. This combined with NoX gases from the EGR system causes the vapours to build up and eventually choke off the intake and air supply to the engine, causing a loss of power, poor fuel economy and in some instances excessive exhaust smoke on vehicles not fitted with particulate filters.

Holden Colorado 2.8L RG Series 2 (Pre-DPF) 2014-2016 ECU Remap