Fuel Delivery/fault Isolation: Other Kia Optima I рестайлинг

Checking Condition

Engine coolant temperature : 80~95°C (176~205°F)

Scheme 67

Scheme 68

1. Disconnect the vacuum hose from the throttle body EVAP Canister purge hose fitting and connect a vacuum pump.
2. Start the engine and check to see that, after increasing the engine speed, vacuum raises fairly constant. NOTE: If there is no vacuum created, it is possible that the throttle body port may be restricted and required cleaning.

Scheme 69

Scheme 70

Scheme 71

Scheme 72

1. Reduce the internal pressure of the fuel pipes and hoses by the following procedures. Open the trunk door and disconnect the fuel pump harness connector in the trunk room. Start the engine and after it stalls, turn the ignition switch to the OFF position. Disconnect the battery negative (-) terminal. Connect the fuel pump harness connector.
2. Remove the bolt connecting the fuel line to the fuel delivery pipe. WARNING: Cover the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure in the fuel line.
3. Using the fuel pressure gauge adapter, install the fuel-pressure gauge to the fuel pressure gauge adaptor. Tighten the bolt to the specified torque. Fuel pressure gauge to fuel delivery pipe : 25~35 Nm (250~350 kg.cm, 18~26 lb-ft)
4. Connect the battery's negative (-) terminal.
5. Apply battery voltage to the terminal for the pump drive and activate the fuel pump: then, with fuel pressure applied, check that there is no fuel leakage from the pressure gauge or connection part.
6. Start and run the engine at curb idle speed.
7. Disconnect the vacuum hose from the pressure regulator, and plug the hose end. Measure the fuel pressure at idle. Standard value : 320~340 kPa (3.26~3.47 kg/cm 2 , 46~49 psi)
8. Measure the fuel pressure when the vacuum hose is connected to the pressure regulator. Standard value : Approx. 255 kPa (2.57 kg/cm 2 , 37 psi)
9. If the results of the measurements made in steps (7) and (8) are not within the standard value, use the table below to determine the probable cause, and make the necessary repairs.
10. Stop the engine and check for a change in the fuel pressure gauge reading, which should hold for approximately 5 minutes. If the gauge indication drops, observe the rate of drop. Determine and remove the causes according to the following table. PROBABLE CAUSE Condition Probable cause Remedy Fuel pressure drops slowly after engine is stopped . Injector leakage . Replace injector Fuel pressure drops immediately after engine is stopped . The check valve within the fuel pump is open . Replace fuel pump
11. Reduce the pressure in the fuel line.
12. Disconnect the hose and the gauge. WARNING: Cover the hose connection with a shop towel to prevent splashing of fuel caused by fuel residual pressure in the fuel line.
13. Replace the O-ring of the end of the hose.
14. Connect the fuel hose to the delivery pipe and tighten with the specified.
15. Check for fuel leakage.

Scheme 73

1. Reduce the internal pressure of the fuel lines and hoses and perform the following operations. Disconnect the fuel pump harness connector in the trunk room. Start the engine and, after it stops, turn the ignition switch to OFF. Disconnect the battery negative (-) terminal. Connect the fuel pump harness connector.
2. Remove the two fitting nuts while holding the fuel filter nuts securely.
3. Remove the fuel filter mounting bolts, and then remove the fuel filter from the fuel filter clamp. Tightening torque Fuel filter fitting nut : 25~35 Nm (250~350 kg.cm, 18~25 lb.ft)

THROTTLE BODY CLEANING

Note. Disconnect the intake air hose from the throttle body, and check the throttle valve surface for carbon deposits. Spray cleaning solvent on the valve to remove carbon deposits.

Scheme 74

Scheme 75

1. Warm up the engine, then stop it.
2. Remove the intake air hose from the throttle body.
3. Plug the bypass passage inlet of the throttle body. NOTE: Make sure the solvent does not enter the by-pass passage.
4. Spray cleaning solvent onto the valve through the throttle body intake port and let it soak for about 5 minutes.
5. Start the engine, race it several times and allow the engine to idle for 1 minute.
6. Repeat Steps 4 and 5.
7. Unplug the bypass passage inlet.
8. Attach the intake air hose.
9. Disconnect the battery ground cable for more than 10 seconds.
10. Adjust the SAS (Speed Adjusting Screw)

Engine coolant temperature: 80~95°C (176~205°F)

Scheme 76

Scheme 77

1. Disconnect the vacuum hose from the throttle body EVAP canister purge hose fitting and connect a vacuum gauge.
2. Start the engine and check that, after raising the engine speed, vacuum remains fairly constant. NOTE: If there is no vacuum, it is possible that the throttle body port may be clogged and require cleaning.