K-Jetronic, engine with the designation KR
Note: For engines with the KE-Motronic system, designated 9A, the idle speed is only checked, but not adjusted. In addition, before checking, it is necessary to interrogate the memory device of the control unit, for which you should contact a VAG workshop. The prescribed values are: for the idle speed of the crankshaft - 800 ±100 1/min, for the CO content measured through the sampling pipe in the engine compartment - 0.2-1.2% by volume. Testing and adjustment conditions (4 subsequent points) as with the K-Jetronic system.
Warm up the engine until the engine oil temperature is not lower than +80°C.
Turn off all electrical consumers, including the air conditioning system.
If the fuel lines have been disconnected or replaced, before checking, the engine shaft must be brought to a speed of 3000 1/min several times, and then the engine must be left to idle for at least two minutes.
Check the ignition timing, see chapter "Ignition system".
Disconnect hoses -1 and -2 of the crankcase ventilation system from the breather housing and lay them so that only fresh air can be sucked in. Loosen the hose clamps beforehand. Connecting element "4" with a calibrated hole must remain in hose "2".
The idle speed stabilization system control valve should vibrate and buzz. If necessary, check the stabilization system, see below.
Attention: Connect the devices only when the ignition is off.
Connect the tachometer and CO measuring device in accordance with the service manual, paying attention to the safety precautions when working with electronic ignition systems, see chapter "Ignition system".
Disconnect plug connector "1" near the ignition coil.
Attention: When carrying out inspection and adjustment work, the cooling system fan must not rotate.
Check the crankshaft speed at idle. Specified value: 1000 ±50 1/min.
Check the CO content. The prescribed value is 1.0 ±0.5% by volume.
If necessary, adjust the above parameters by alternately rotating the idle speed adjustment screws "A" and the CO content "B".
Pull out the safety cap of the CO adjustment screw. To do this, drill a 2.5 mm drill into the cap and screw a 3 mm screw into the drilled hole. Use pliers to pull out the cap by the screw.
Adjust the CO content using a 3 mm Allen key (arrow), e.g. HAZET 4516.
Caution: When adjusting the CO content, do not press the adjusting screw down or, respectively, do not lift it. Do not apply gas when the adjusting key is inserted (danger of bending).
After each adjustment, remove the adjusting key immediately and briefly apply gas.
Caution: If the engine speed is not regulated to the specified value, check the idle speed control system.
After adjustment, insert a new safety cap using the pin.
Reconnect the high tension wire near the ignition coil.
Connect the crankcase ventilation hoses to the cylinder head and secure with clamps.
Note: If the CO content has now increased, the reason is not incorrect adjustment, but rather the enrichment of the combustible mixture due to the influx of gasoline vapors from the crankcase, where gasoline gets mainly during short-distance trips.
During long, continuous trips, the proportion of gasoline in the engine oil decreases, and the CO content in the exhaust gases returns to normal. This can also happen quickly after about a 30-minute trip or another oil change.
Measuring instruments must be switched off when the ignition is off.
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