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oil filter on a Mercedes 190E 1986 is in the back of engine
I would ask Google.
Why does my fuel pump keep running on my 1984 190E
nope
The 1986 Mercedes-Benz timing marks can be found on the main pulley. The timing marks will be scattered around the outside of the pulley.
Information can be found easily on the web - join a club! There are thousands of enthusiastic 190E drivers out there willing to help!
It is not impossible but it would be a nightmare working out the electronics, and the transmission is not compatible
NO
You already have one. Under the hood on a placard & possibly in your owner's manual.
1986 Pontiac Firebird 2.8 Liter Firing Order
The firing order for a 2.0 L. is 1423.
Located just behind the front license plate. Looks like a little pencil.