It is not adjustable......
It has been pre set at the factory.
In the throttle body.
As far as I know the only road speed governor would be an aftermarker unit. It can be removed but you would have to know what you're doing. The ones I've seen take the thottle cable off the thottle body and run it to the aftermarket unit. Then a new cable from the unit back to the thottle body. I guess you could hook the original cable back to the thottle body and "by-pass" the unit. Rich
lookin at engine from the front it is located to the right above the valve cover close to the thottle body. has a wire and vacume hoses on it
The MAPP sensor is located on the passengers side of the thottle body. Remove the "dog box" and when looking from the inside of the vehicle you should see it on the right side of the thottle body. It's kinda tricky to remove ...but it is do-able. Good Luck ... hope this helps. MR. X
right in front of the thermostat on the bottom rad hose beside the thottle body
On the V6 acc. just connected under the thottle body.
If it's an EFI engine you do not adjust the mixture screw. The mixture is computer controlled.
I believe it is on the driver side, top of the engine block, below the point where the air filter canister connects to the thottle body. look for a single bolt thru a sensor (diameter of a quarter) and wires attached. Do I relpace the snser from under the hood or do I have to get under the car?
engine will run but will not idle you could possibily block of both ends and adjust throtle body stop screw
To adjust the throttle body on a 1978 Mercedes 450SL, first ensure the engine is turned off and cool. Locate the throttle linkage and check for any play or binding, then adjust the idle speed screw to set the desired idle RPM. If necessary, you can also adjust the throttle position by loosening the bolts that secure the throttle body and repositioning it slightly. Always recheck the idle speed after making adjustments and ensure all connections are secure before starting the engine.
NO there is no ADJUSTMENT on the TBI / Throttle body. If the check engine light is on then you need to have the engine scanned with an engine scanner to see what is going on with the emissions system / engine sensers.
This is generally the explanation when you get a PO401 check engine code. It is ussually caused when the carbon builds up in the channel leading from the EGR through and into the thottle body. Most of the time it can be fixed by cleaning the passage with a good carb cleaner and a wire pipe cleaner restoring the flow of air through the passage. Sometimes you might have the replace any one of the EGR Value, EGR Solinoid or the EGR Pressure Sensor. These can be costly, so begin with the cleaner. You may have to remove the thottle body face plate to gain better access to the channel.