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Check Air leakage

(1)

Check gasket is contaminated or misinstalled.

▶ Installation or any damage of Throttle body gasket

▶ Installation or any damage of the gasket between intake manifold and surge tank.

▶ Clogging of intake manifold or injectors resulting from foreign materials.

▶ Open stuck of PCSV caused by foreign materials between surge tank and PCSV.

(2)

Has a problem been found ?

YES

▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

▶ Go to "Check Fuel Line Inspection" as follows.

Check Fuel Line Inspection

(1)

Check clog, contamination and installation of each hose as follows.

▶ Check connection of each fuel line.

▶ Check damage, interference and installation of vaccum hose connected to fuel line.

▶ Check that fuel pipe in the fuel line is bent and sqeezed.

▶ Check any fuel leakage from fuel pipe in the fuel line.

(2)

Has a problem been found ?

YES

▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair" procedure.

▶ Go to "Check fuel pressure" as follows.

Check Fuel Pressure

caution

Be cautious that Fuel is explosive and an empty fuel tank can still contain explosive gases.When working on fuel system make sure to supply adequate ventilation to the work area. Do not smoke, and keep sparks and open flames away.

The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of presonal injury or fire damage to vehicle components.

(1)

Start the engine and disconnect the fuel pump relay.

(2)

Wait until fuel in fuel line is exhausted and the engine stalls.

(3)

Turn the ignition switch OFF position.

(4)

Install the fuel special service tool for measuring the fuel pressure between the delivery pipe and the fuel feed hose.

(5)

Connect the fuel pump relay.

(6)

With fuel pressure applied, check that there is no fuel leakage from the fuel pressure gauge or connection part.

(7)

Start the engine and measure the fuel pressure at idle.

Specifications : 374 ~ 384 kPa(3.82 ~ 3.92 kg/cm², 54.3 ~ 55.8 psi)

(8)

Stop the engine and check for a change in the fuel pressure gauge reading.

Specifications : After engine stops, the gauge rdading should hold for about 5 minutes.

(9)

Is the measured fuel pressure within specifications ?

YES

Go to "Component Inspection" procedure.

Repair or replace according to the table below.

Condition	Possible Cause	Suspected area
Fuel pressure too low	Clogged fuel filter	Fuel filter
Fuel leak on the fuel-pressure regulator that is assembled on fuel pump because of poor seating of the fuel-pressure regulator	Fuel pressure regulator
Fuel pressure too high	Sticking fuel pressure regulator	Fuel pressure regulator
Fuel pressure drops slowly after engine is stopped	Injector leak	Injector
Fuel pressure drops immediately after engine is stopped	The check valve within the fuel pump is open	Fuel pump