May be (probably) the cold start valve. I'm not sure how to check it to see if that's the problem. They are expensive even if purchased aftermarket. Good luck!
firing order is1432
Premium. Always.
test
This is a job for a quailified repair specialist not for a DIYer.
If you have a 1989 or a 1990 2.6 Liter automantic transmission Mercedes Benz,then there is no PCV. It has already passed emissions.
call the dealership give the vin #,and they will give you the radio code
Check your battery connections. If the terminals are good then check the starter.
Contact a Mercedes dealer. Febi/bilstein Part# 08972 comes in 1 liter bottles. The power steering capacity is 0.6 liters(0.6US qt)for a 1990 190E 2.6
You might try 33343. It is the one I use for my 1991 model
It is under the transmisson. the wat to check the level is by the dip stck with the red cap just behind the last spark plud
As per page 95 of the owners manual The electrode gap is 0.8 mm (0.032 in)
Try Fuel Pump relay behind battery small silver box with a fuse ontop.