EGR valve stuck open by lumps of carbon
My 156JTD 20 valve went into James Bond mode again this weekend putting out some very impressive smokescreens at low revs.
The culprits, for the second time in 15 months, were lumps of solid carbon in the EGR valve about the size of a match head which had jammed the valve in the open position.
It was fairly easy to fix, just a question of removing the valve from the car and prising the lumps (about 5 or 6 of them) from between the valve and its seat, but not something I
would prefer to spend my weekends doing .....
As this has now happened twice I am starting to worry where these lumps of hard carbon are coming from, and also how many are actually getting through and recycled into the engine. Does anyone have any idea what might be causing their formation and
whether there is anything I can do to prevent a further repetition?