Attention: The following describes the adjustment on a 112 hp engine. (designation DZ). Differences in the adjustment of other engines are given at the end of the chapter.
Warm up the engine, oil temperature +80°С.
Turn off all electrical consumers, including the air conditioner.
If the injection lines were loosened or replaced before the test, give gas to 3000 rpm several times and leave to idle for at least 2 minutes.
Check ignition timing.
Clamp the hose from the dual-line valves with a clamp -1- to increase the idle speed.
Detach hose -2- for crankcase breather at cylinder head and position so that fresh air can be drawn in. If the hose is reinforced with a wire clamp, the special pliers HAZET 798-4 should be used.
Attention: Connect measuring instruments only when the ignition is switched off.
Connect the tachometer and CO measuring device according to the instructions.
Attention: The fan regulator must not operate during the check and adjustment.
Check the idle speed, it should be: 900±100 rpm.
Check the CO content, it should be: 1.0±0.5%.
If necessary, achieve the required values with the idle speed adjusting screws -A-, and the CO content -B-.
Remove the plug of the CO adjustment screw. To do this, drill it with a 2.5 mm drill, screw in a 3 mm self-tapping screw and remove it together with the plug with pliers.
Set the CO content with a 3 mm Allen key -arrow-, eg HAZET4516.
Caution: When adjusting the CO, do not press the adjusting screw either up or down with a wrench. With the key on, do not give gas.
After each adjustment, immediately remove the key and let it go.
After adjustment, press in a new plug with a suitable rod.
Fit the crankcase ventilation hose and secure with a clamp.
Attention: If the CO content now rises, the cause is not an incorrect adjustment, but an enrichment of the mixture from the crankcase due to dilution of the oil by gasoline during short trips in cold weather.
With a longer trip, the proportion of fuel in the oil decreases and the CO content returns to normal. This can be achieved with a 30 minute drive or a scheduled oil change.
Switch off the measuring devices with the ignition off.
Remove hose clamp.
5 cylinder engine
Connect an ammeter with a VAG 1315A/2 connecting wire to the idle speed stabilization control valve. If there is no connecting wire, connect an ammeter in series between the removed plug and the control valve.
Attention: Only connect the measuring device with the ignition switched off.
115 hp engine: Clamp off crankcase breather hose -1- with a suitable screw clamp. Remove the oil level indicator. Place a cloth under the guide rail to avoid splashing.
136 hp engine: Disconnect the crankcase ventilation hose and plug it with a suitable plug.
Start the engine and let it idle.
Check control current; it should be within 430±10 mA, and fluctuate slightly.
Check CO content; should be: 1.0±0.2%.
If necessary, achieve the required values by turning the adjusting screws -A- for idling, -B- for the CO content.
Check the idle speed. Should be: 750-850 rpm.
If the parameters are out of range, check idle speed stabilization. This should also be done if the measured control current (470 mA) does not change when adjusting screw -A- is turned.
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