1998 Audi A4 Quick Tips Pdf

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Quick Tips Audi A4 page 1 page 26 3800 Hamlin Road Auburn Hills, Michigan 48326 http://www.audi.com Quick TipsTM is not intended as a substitute for your Owners Manual or Sound System booklet. If you have a question or concern that is not resolved by your Audi Dealership, please call Audis Customer Relations Department at 1-800-822-2834, 9 a.m. to 7 p.m. eastern time. ©1997 Audi of America, Inc. Quick TipsTM is a trademark of Calcar. "Audi", "A4", "quattro", and the four rings emblem are registered trademarks of Audi AG. "Avant" is a trademark of Audi AG. "Dolby" is a registered trademark of Dolby Laboratories. "Tiptronic" is a registered trademark of Dr. Ing. h. c. F. Porsche AG. 8/97 Printed in U.S.A Part No. W42 552 304 24 It has always been Audis policy to continuously improve its products. Audi, therefore, reserves the right to make changes in design and specifications, and to make additions or improvements..

Servicing injection system
The engine control unit has a self-diagnosis capability. Before carrying out repairs and fault finding the fault memory must be interrogated. The vacuum hoses and connections must also be checked (unmetered air).
♦ Fuel hoses in engine compartment must only be secured with spring-type clips. Clamping-type or screw-type clips must not be used.
♦ A voltage of at least 11.5 V is required for proper operation of the electrical components.
♦ Do not use sealants containing silicone. Particles of silicone drawn into the engine will not be burnt in the engine and will damage the Lambda probe.
♦ The vehicles are fitted with a crash/fuel shut-off system. This system is designed to reduce the risk of a vehicle fire after a crash by deactivating the fuel pump via the fuel pump relay.
♦ At the same time, this system also improves the engine’s starting performance. When the driver’s door is opened, the fuel pump is activated for 2 seconds in order to build up pressure in the fuel system → Chapter (page 1).

The fuel system is pressurised. The fuel pressure in the high-pressure part of the injection system must be reduced to a residual pressure prior to opening; for procedure see → Chapter (page 3). The connection must be opened IMMEDIATELY after reducing the pressure by wrapping a cloth around the connection and allowing the residual pressure (approx. 6 bar) to dissipate.


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