Description
Throttle bodies are a single chamber horizontal flow design (except for the D16Y7 engine) and vertical flow (engine D16Y7). The lower part of the throttle valve is heated by the engine coolant from the cylinder head. Idle speed adjustment screw, which increases/decreases air flow and the inlet of the fuel vapor accumulator tank (D16Y6, В16А2, В16А4, В16А5, В16А6) located on the top of the throttle body.
Inspection
In addition to the D16Y7 engine:
Attention. Do not adjust the throttle stop screw. It is installed at the factory.
1. Start the engine. Leave at 3000 rpm no load (A/T in [N] or [P], M/T in neutral) until the radiator fan comes on, then leave it at idle.
2. Disconnect the vacuum hose (to the EVAP fuel vapor accumulator reservoir) from the top of the throttle body, attach a vacuum gauge to the throttle body.
3. Leave the engine idling and check that the pressure gauge detects that there is no vacuum.
If there is vacuum, check the throttle cable.
4. Check that the vacuum is indicated on the pressure gauge when the throttle is slightly open from idle.
If the pressure gauge indicates no vacuum, check the throttle body inlet. If the throttle body inlet is clogged, clean it with carburetor cleaner.
5. Stop the engine and check that the throttle cable operates smoothly without binding or pinching.
If there is any abnormality in the above steps, check:
- Excessive wear or play in the throttle shaft.
- The throttle lever is stuck or pinched in the fully closed position.
- The gap between the throttle stop screw and the throttle lever in the fully closed position.
Replace the throttle body if there is excessive play in the throttle shaft or if the shaft is binding or pinched.
Engine D16Y7:
1. Check that the throttle cable operates smoothly without binding or pinching.
If there is any abnormality in the above steps, check:
Excessive wear or play in the throttle shaft.
Removal
The throttle lever is stuck or pinched in the fully closed position.
The gap between the throttle stop screw and the throttle lever in the fully closed position.
Replace the throttle body if there is excessive play in the throttle shaft or if the shaft is binding or pinched.
Warning:
- throttle stop screw in non-adjustable,
- after reassembly, adjust the throttle cable and throttle control cable,
- The throttle position sensor is not replaceable.