While I was finishing a tuneup on my '83 380SL, a neighbor who is a mechanic took it upon himself to try adjusting the allen nut adjustment which is accessible through the air filter cover...my guess is that its a fuel regulator of some sort??? In any event, the car runs great but the mileage dropped to only 9-10 mpg...UGH!!!
My question is this: is there a way I can adjust this back to optimize the mileage again? (if I try to adjust it while the engine is running it dies out right away)
Many thanks,Jeff

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JEFF & JO and our 3 Golden retrievers:
SUNNY, CHEYENNE, and POCO (the little Chupacabra)

'84 380SL (mine) 222K, still strong but showing its age
'91 300CE (hers) 135K, near mint in and out
'83 380SL (mostly mine) 150K, mint in & out