Hi everyone, this is my first post on here.
I currently own a 1.6, 8 valve petrol mark 4 Astra estate.
I`m looking to change to the 1.7 16v dti or cdti estate, again in the mark 4 bodyshape.
I went to look at a nice clean dti example yesterday, well priced, but a couple of issues bothered me.
Firstly, after starting the engine from cold, I noticed the coolant seemed to be re-circulating via the coolant header tank. Is this normal on this model of engine, or could it be pointing to cooling system / head gasket problems?
Secondly, when the engine was revved (with the car stationary) there seemed a distinct change in engine noise ( but not a rattle ) about a third to halfway up the rev range. The noise returned to a normal diesel tickover as the revs dropped.
The only other diesel I`ve owned was the old 1.7 non turbo Astravan, and the engine noise didn`t alter at all when it was revved.
Again, do all dti`s do this, is it just the turbo affecting the engine note?
Hope you can help.