Thread: Direct injection carbon build up

I read a while back the early NT 2007 Pajeros had carbon build up. The solution was manifold off for a clean.

Our Peugeot was suspected of having carbon build up as the cause of engine surging. I was charged for some chemical treatment that was suppose to clean the manifold. An EGR blanking plate ended the problem.

Sounds like someone on Utube making a good story re "direct injection engines-- not cleaning back of valves etc". All diesels have the diesel injected into the chamber after the valves, whether indirect (chamber) or direct injection.
EGR blanking-- there shouldn't now be any carbon in the inlet manifold or back of inlet valves!

You will find a hell of a lot of gunk in the manifold that will need cleaning out. Thick black sticky **** . Comes through from the ERG valve.

Originally Posted by 33chinacars

You will find a hell of a lot of gunk in the manifold that will need cleaning out. Thick black sticky **** . Comes through from the ERG valve.

Just got rid of the ERG valve . Used a blank of ebay. I could not believe the amount of sticky black carcenagenic looking crud in there. I will be pulling the manifold off at next service & giving it a good clean. Only driven 10 ks so far down to Avalon & back but it seems quiter & idling smoother already. Now for a remap & cat back exhaust system.

I'm sure you will be happy & so will your motor

this is an issue that has come up with the new DI petrol engines. Diesels have had DI for decades (300tdi) and I've not come across problems on a DI diesel.

VW have added a 2nd set of injectors on the mk7 GTI and R. the primary injectors in the cylinder and the 2nd set adding fuel into the manifold to prevent this issue.

I've had the head off mine, and the carbon build up was mild, but there. Nothing to get in a twist about and it had 230,000KM on it. EGR blanking was fitted a couple of years ago. Bigger problem as mentioned is the thick black sludge that will be in your inlet manifold from the EGR. It's bloody hard to shift too. I had my manifolds in my mates spin wash for 8 hours solid to loosen it all up, but the were sparkling clean when I reinstalled them.

I took the opportunity to pop all the valves out anyway and clean them up, as well as the inlet tracks on the head. Engine runs very smooth now, but no idea if that's anything to do with what I've done, but it sure didn't hurt.

Originally Posted by Defender Mike

Just got rid of the ERG valve . Used a blank of ebay. I could not believe the amount of sticky black carcenagenic looking crud in there. I will be pulling the manifold off at next service & giving it a good clean. Only driven 10 ks so far down to Avalon & back but it seems quiter & idling smoother already. Now for a remap & cat back exhaust system.

Then a transmission rebuild...