Hello everyone,
I have been trying to figure out why our '89 190e 2.6 seems sluggish and sometimes knocks bad during acceleration. Sometimes it is smooth and peppy. Could the timing not be advancing correctly? and how would I check it? Thanks to all, Have a good holiday tomorrow!

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German autos!!!
'67 250se coupe
'89 190e 2.6
'05 BMW x5
'59 0319 diesel Omnibus.
Italian bikes!!!
'64 Lambretta Special 185 hot rod scooter
'66 Lambretta SX200
'59 Lambretta 250 race bike
'70 Lambretta GP200
'77 860gt ducati
'66 ducati monza