I used Oven Cleaner Foam in My Air Intake With Engine Running, to clean out carbon fuel deposits from EGR Valve, Cooler, Inlet Manifold, Actuator Gate Valve, Catalytic Converter, without taking my VW Sharan 1.9 TDI to bits.
The Product I used is Mr Muscle, which cost £1.89. It consists of Sodium Hydroxide, which is very effective at removing baked on carbon and unburned fuel exhaust deposits that block up the EGR valve and prevent adequate air intake. I was confident to do this when I saw it being used to clean a turbocharger and waste gate valve, so I took it to the next level by spraying it directly into the Exhaust Gas Recirculation valve through the air intake pipe.
Seafoam contains potassium hydroxide and is sprayed directly into a running engine through the air inlet. It reacts with aluminium just like MR Muscle Oven cleaner, which contains sodium hydroxide does.
Our car has an intermittent problem with going into limp mode and although it has improved greatly, it still goes into limp mode and the engine management light comes on.
After this treatment, there has been a huge improvement in performance and economy over 800 miles of motorway driving. We were getting around 32-36 miles per gallon. Now we are getting 44.5 miles per gallon, although significantly less than this around town.
