I have a Mercedes 1976 280C and it does not pass smog test. CO is 11% Hydrocarbons are three time allowed level. It looks like fuel mixture too rich. Car has lots of power. Replaced spark plugs
and points engine running fine my next step wiil be to lean the carburetor by turning fuel mix screws in. On the carburetor it says SOLEX A1. The problem is I cannot find the fuel mixture screws I can see a screw on the bottom front left of the carburetor. I think that is one There is suppose to be another on on the left but there are connections there instead. Where are the fuel mixture adjust screws? Or does it only have one it seems to be a double barrel carburettor.
JA: What specifically didn't pass the test? When was your last oil change?
Customer: I mean another on the right when standing in front of the car
JA: What is the model of your '76 Mercedes?
Customer: 280C I do not drive it much oil change 2 years ago .
JA: Are you fixing your vehicle yourself? What have you tried so far?
Customer: I have only replaced the spark plugs and the points and reset the idle. I have put in a new air filter.
JA: Anything else you want the mechanic to know before I connect you?
Customer: That is all i can think of