Hello chaps.
Bought R5 87 Automatic C2J.
It goes quite good but with constant ticking noise from the engine. The ticking rises with acceleration and slows with deceleration...i.e. it exactly follows engine normal running tact. The fuel consumption is approx. twice higher too

~200 MPG.
the rest is just fine.
any idea what can cause that noise?
any help appriciated.
dmitri