Switch off the air conditioner, on the automatic transmission set the lever to the position "R".
Switch off electrical consumers. Connect the tachometer and CO meter according to their instructions, leave the air filter fixed.
crankcase breather hose (see arrow), as well as a vacuum hose for the accelerator pump (near right) remove and mute.
Start the engine and let it idle.
Check intake system for tightness. To do this, lubricate all the places of the intake system seals with gasoline using a brush. If the engine speed is increased briefly at the same time, the engine draws in additional air. Locate leaks and eliminate leaks.
Attention: Do not inhale fuel vapours, poisonous! Do not splash gasoline on hot parts or the ignition system. Flammable!
Check if the throttle lever is on the idle stop. To do this, slightly raise the throttle lever and increase the speed to about 2500 rpm. Then release the lever, while it should independently return to the idle stop. Otherwise, lubricate and adjust the throttle levers.
If so, check the tempomat adjustment. First version with cable - the cable must be tension-free on the control lever, otherwise turn the adjusting nut to the appropriate position. Second version: unhook the connecting rod and pull down as far as it will go. Rotate the ball cup on the rod until it is directly against the ball head. Then unscrew the ball cup 2 turns and secure with a lock nut. Attach the connecting rod.
Adjust the idle speed with the adjusting screw (68) to the control value.
Unscrew the plug bolt of the front exhaust pipe on the front of the exhaust manifold (cylinders 1-3) and connect a CO meter. Check the CO content, note the measured value.
Then unscrew the plug bolt on the rear exhaust pipe (cylinders 4-6) and connect a CO meter. Plug the front exhaust pipe.
Check the CO content and compare this value with the value measured earlier (cylinders 1-3). Both values should be approximately the same and be within the scatter of the reference value.
Otherwise, adjust the CO values using two adjusting screws (see arrows). The arrow on the right in the figure points to the screw for cylinders 1-3, while the screw for cylinders 4-6 is shown with an arrow on the left. When the screw is unscrewed, the mixture becomes richer, when screwed in, it becomes poorer. Shut off the exhaust manifold.
Adjust the adjusting rod so that when the gas is applied, the transmission of movement to the rocker arm occurs without play.
Adjust vacuum regulator.