Hi all,

a week ago I removed the throttle, and I found the plenum to be ok to my eyes.

But when I cleaned it with some white paper, the paper became black !

Engine is 1000 miles old.

Do you think it could be due to reversion ?

Have to try to retard intake cam of a pair of degrees ?

TIA !

Bye...

 

Your post makes little sense, but i would say its exhaust gas recirculation doing its thing and to not mess with timing at all.

 

Sorry, i forgot to tell you that i have no more the egr...

 

If you got no more EGR then it must be the remaining molybdenum grease on the TB plate that the mitsu assembler overserviced from the factory.

Also, if you still have the rubber ducting it's netorious of yeilding black crud. For example, take a wet cloth and wipe the inside of the hose - black, do it again - same, the rubber will just give off the crap as long as it's in there.

 

No, I don't think it comes from before the throttle... I changed every rubber ducting to silicone ones !

 

It probably developed between the time the car was first started and the removal of the EGR.

 

Nope... as I told the engine was rebuilt 1000 miles ago...

 

probably didnt clean out the intake manifold. dude its not a big deal, insides of engines get dirty.

 

crank case oil gets aerated and sent back into the intake system. It is a normal occurrence, but many people install oil catch cans to remove this, because it robs power from the engine, forcing it to burn that recirculated oil.

 

Exactly,

in fact I routed to atmo the oil vapours many years ago...

 

Broddy... good call. I forgot all about that!