Engine tuning

ENGINE TUNING

Service repair no - 19.22.13

The position of the Idle Air Control (IAC) valve can be checked using TestBook and adjusted if necessary through the by-pass screw in the plenum chamber. The by-pass screw is covered by a tamper proof plug

FUEL TANK DRAIN

which can be extracted using a self tapping screw. Service repair no - 19.55.02

All vehicles:

1. Ensure air conditioning and all electical loads are off. Vehicle must be in neutral or park.
2. Carry out tuning or base idle setting procedure

carrying out following instructions.

as applicable using TestBook.

FUEL SYSTEM DEPRESSURISE around components to prevent ingress of foreign matter into fuel system. Service repair no - 19.50.02

WARNING: Fuel pressure of up to 2.5 bar₂ (36lbf/in ) will be present in the system, even if the engine has not been run for some time. Always depressurise the system before disconnecting any components in the fuel feed line (between fuel pump and pressure regulator). The spilling of fuel is unavoidable during this operation. Ensure that all precautions are taken to prevent fire and explosion. fuel tank. Follow the fuel bowser manufacturers instructions for safe use of bowser. NOTE: Fuel pressure can be relieved at fuel rail feed union or fuel filter unions.

1. Position cloth around relevant union to protect against fuel spray.
2. Carefully loosen union.
3. Tighten union to correct torque once pressure is relieved.

• WARNING: Ensure that Fuel Handling
• Precautions given in Section 01 -
• Introduction are strictly adhered to when

CAUTION: Before disconnecting any part of the fuel system, it is imperative that all dust, dirt and debris is removed from

1. Disconnect battery negative lead.
2. Remove fuel filler cap.
3. Using a fuel bowser with an 18 mm (0.75 in) outside diameter hose, pass hose into tank through filler neck.

• NOTE: Because the fuel tank filler stub
• houses a restrictor, repeated attempts may
• be necessary to enter the hose into the

4. Siphon fuel from fuel tank.
5. Fit filler cap.