I don't think those are injectors i think they are Bosch cold start valves off of some of the early 80's Bosch systems
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As long as you don't hear any rattling noises from the blower and keep an eye on the fluid i wouldn't worry about it...
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Prob just the seal leaking boost into snout then.. I always fill the fluid just to the bottom thread of the fill plug hole...
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They will also leak from vent if snout oil is over full... I just figured you would have checked that already.... Does blower make any rattling noises kinda like a rock tumbler? A coupler will rattle at idle if rotor bearings or gears are failing it will rattle off idle have someone hold it...
Without knowing all the info on your car i would say that the rotor bearings were going...the material from the bearings going is what destroyed your coupler.... And with the play in the bearings boost is leaking past the seal or the seal is just bad... Zzp was selling rotor packs for like 400$...
From the research I did a while back.
Series 3
N/a engines went to aluminum upper intake
Heads- intake port improvements and intake valves are 1.83 vs 1.80 on series 2. the exhaust valve is also slightly larger but this was done on some of the later series 2 also
Series 3 all drive by wire...