Note: Before adjusting, check that the ignition system is properly adjusted, the air filter is clean and the engine is in good mechanical condition.
1. With the engine at normal operating temperature, connect a tachometer to the engine in accordance with the manufacturer's instructions.
2. Let the engine idle and compare the idle speed with the value specified in Specifications. If adjustment is necessary, loosen the lock nut and turn the quantity screw to obtain the desired speed. The quantity screw is located at the rear of the throttle body (see figure 3.52). After completing the adjustment, tighten the lock nut.
Figure 3.52. Quantity screw
3. To check the composition of the mixture (cO content in exhaust) connect the gas analyzer in accordance with the manufacturer's instructions. With the engine running at the specified idle speed, measure the CO content and compare it with Specifications.
4. If adjustment is necessary, remove the plug from the quantity screw located on the air flow sensor (see photo). Turn the screw clockwise to enrich the mixture or counterclockwise to combine it.
Photo 22.4. Plug (shown by arrow), closing the quality screw.
5. Upon completion, adjust idle speed as necessary.
6. If you are unable to achieve the desired CO content in the exhaust, this indicates a malfunction of the injection system or severe engine wear.
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