Mono-Jetronic, RP motors, IF Mono-Motronic, RP motors, AAM, ABS, ADZ
Caution: The idling speed and the CO content must be checked together. Both parameters are not adjustable.
Test prerequisite: The exhaust system has been checked. All piping connections must be tight.
Warm up the engine to an engine oil temperature of at least +80°C.
Turn off all electrical consumers. Turn off the air conditioning system.
Check oxygen sensor adjustment. To do this, interrogate the storage device, eliminate the existing malfunctions.
Check ignition timing, see chapter «Ignition system».
Attention: Only connect devices with the ignition switched off.
Connect the crankshaft speed meter according to the service manual.
Connect the CO measuring device to the CO sampling tube in the engine compartment. The CO sampling tube is welded to the front exhaust pipe and is usually closed with a light blue cap.
Caution: Push the hose of the measuring device firmly onto the sampling tube and make sure that the connection is tight.
Start the engine and let it idle.
Attention: During the check and adjustment work, the fan of the cooling system must not work.
Check the engine speed when idling. Prescribed values:
Check CO content. prescribed value (for all engines): 0.2-1.2% by volume.
CO and idling speed values are not adjustable. In the event of a deviation from the prescribed values, check the intake system in the following sequence and rectify the faults. Check all vacuum hoses for porosity and tight connections. Check the tightness of the connection between the flanges of the central injection system and the inlet pipes. After that, check the activated carbon system for fuel tank ventilation (workshop work).
Switch off measuring devices with the ignition off.
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