Throttle body of an automobile engine. Free Technical Library article

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Automotive engine throttle body

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Encyclopedia of radio electronics and electrical engineering / Automobile. Electronic fuel injection

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The throttle body (KDZ 2112-1148010-32) is an electromechanical unit of the injection system and largely determines the normal operation of the engine.

The throttle body includes a mechanical throttle actuator, fittings for connecting the hoses of the KDZ heating system, a fitting for connecting the hose of the engine crankcase ventilation system at idle (idling), a fitting for connecting the canister purge system hose (if there is no adsorber in the system, this fitting a plug is installed), a throttle position sensor and an idle speed controller, a screw for adjusting the extreme throttle position and two screws for factory (technological) adjustments.

For better mixture formation, heating is provided in the throttle body. This channel (see photo 2) is connected to the engine cooling system.

During engine operation, the coolant circulates through the throttle body and, after the engine warms up, provides heating of the short-circuit valve. As it passes through the throttle body, the intake air is also heated.

During the operation of the car, it is necessary to monitor the condition of the hoses, because. in some places they are subject to abrasion due to contact with other engine elements.

Photo 3 shows a hose connecting the channel of the throttle body to remove crankcase gases from the engine to the cylinder head.

This channel provides the supply of gases from the engine crankcase to the throttle space. Further along the intake tract, crankcase gases are mixed with air and enter with it into the combustion chambers of the engine. Thus, crankcase gases are removed from the engine at idle (idling). Accordingly, malfunctions of the engine or oil separator can lead to an increase in the CO content in the exhaust gases.

If an adsorber is installed on the car, to purge it in the throttle body, a channel is provided for supplying fuel vapors to the throttle space through the channel for additional air supply of the idle speed controller (IAC) (see photo 4). Like air through the IAC, fuel vapors from the canister enter the intake tract bypassing the throttle. Accordingly, if the adsorber purge valve (CPA) malfunctions, the fuel mixture may not be sufficiently enriched in some engine operating modes, which may affect engine operation.

With the correct operation of all elements, the throttle body, as a rule, does not need any adjustments. However, in this design, in my opinion, there is an unfortunate drawback. The fact is that although there is a separate channel for the minimum air supply in the throttle body, it is not used and is muffled. Thus, if a situation occurs when the throttle is closed, and the IAC for some reason (for example, is faulty) did not provide air supply bypassing the throttle, the engine will simply stall (because there is no air flow, there will be no fuel supply). This situation is also possible for a number of other reasons. However, you can get to the parking lot of the car or car service without any problems if you adjust the initial throttle position accordingly. There is a screw on the throttle body for this adjustment (see photo 5).

Using this screw, you should try to adjust the minimum idle speed (usually ~ 600-650 rpm.). But it should be remembered that a slightly open throttle will inevitably shift the initial position of the TPS (throttle position sensor). In this regard, it will also be necessary to adjust the initial position of the TPS. Adjustment of the minimum idling speed should be carried out with the engine warmed up to operating temperature and with the engine power consumers turned off.

Sequencing:

1. warm up the engine to operating temperature
2. turn off the ignition and connect the necessary measuring devices
3. disconnect the idle speed controller connector
4. loosen the screws securing the throttle position sensor 5. slightly open the throttle valve to a larger angle with the screw
6. start the engine
7. Adjust the throttle limit screw to adjust the minimum idle speed
8. adjust the initial position of the TPS and fix it
9. turn off the ignition
10. disconnect the battery and non-standard measuring devices
11. Connect the idle speed controller connector.
12. connect battery
13. smoke :o)

However, this operation is not as easy as it seems at first glance. The problem is that the manufacturer "took care" to make this setting problematic, and for some, impossible. The adjusting screw is planted on the paint and it is extremely rare to turn it. Possible solutions to this problem coming soon...

Publication: cxem.net

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