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Changing spark plugs on a 1996-2001 A4/S4

On 4/12/2002 4:10:00 PM, LaShanta Freeman wrote:


Richard Hicks is changing the sparks on his 1999 1/2 Audi A4 1.8 liter. While surfing the Audi A4/S4 Repair manual for model years 1996 to 2001 he was only able to locate three lines stating to remove the spark plug and put in a new one.

Can some one please give a better outline of this procedure.


Your manual is an "Official Factory Service Manual". That means you've got the official information from Audi that their service technicians use when they are working on your vehicle.

However, that also means that the information is presented as a professional factory-trained service professional would need it. Certain procedures are glossed over, as they assume the mechanic does not need guidance.

We also produce a paper service manual:
Audi A4: 1996-2001 Service Manual 1.8L Turbo, 2.8L, including Avant and quattro
This book is an edited and condensed version of the factory service information, with certain additions, such as some basic maintenance procedures.

It includes a bit more on your spark plug change procedure, which I have briefly summarized below.
Hope this helps,
Chris Miller, Bentley Publishers


Spark plugs, replacing

Spark plugs used on all Audi engines are classified as "long life" by their manufacturers and generally need replacement only during scheduled maintenance services.

Spark plugs are generally pre-gapped by the manufacturer during production but should be checked before installation.

Specification

Spark plugs (AEB, 1.8L engine)

  • Gap 0.70 to 0.90 mm (0.029 to 0.035 in)
    Spark plugs (ATW, AWM, 1.8L engine)
  • Gap 0.80 mm maximum (0.032 in)
    Spark Plugs (AFC, ATQ, 2.8L engine)
  • Gap 0.90 to 1.10 mm (0.035 to 0.043 in)
    Spark Plugs (AHA, 2.8L engine)
  • Gap 1.6 mm (0.063 in)
  • Audi specifies spark plugs made by several different manufacturers and some engines use different heat ranges depending on the model year. Specifications and part numbers can also change. For these reasons, it is advisable to always check with an authorized Audi Dealerís parts department or aftermarket parts specialist for the latest parts information. Spark plug specifications and part numbers may also be found in the applicable Fuel Injection and Ignition section, Repair Group 28.

    Spark plug replacement depends on ignition system configuration. Four cylinder engines and some 6-cylinder engines use a system with the ignition coil mounted directly above the spark plug. With this version (individual coils), the coil must first be removed. Earlier 6-cylinder engines use 3 double ended coils mounted at the front of the engine with conventional spark plug wires.

    Spark plug replacement, individual coils

    Remove sound absorber panel(s) (see illustrations).


    Sound absorbing panel over 4-cylinder engine, removing

    Note: Later production 1.8-liter turbo engine shown, earlier 1.8-liter turbo is similar.


    Sound absorbing panel over 6-cylinder engine, removing

    Note: 2.8-liter 5V V6 engine shown; earlier 2V V6 is similar.


    Disconnect harness connector (1) from cylinder #1 ignition coil (2). See illustration.

    Ignition coils, removing

    Remove coil securing bolts and ignition coil. If coil is stuck, use a twisting movement to remove.
    Remove spark plug with a 5/8 inch (16 mm) spark plug socket and extension or with special tool 3122B.
    Replace spark plug.
    Reinstall ignition coil and harness connector for cylinder #1.
    Repeat procedure for remaining cylinders.
    Reinstall sound absorber(s) as required.

    Spark plug replacement, double ended coils

    Remove sound absorber panel(s) as previously described.
    Remove first spark plug wire with a suitable puller. Do not pull directly on wires.
    Remove spark plug with a 5/8 inch (16 mm) spark plug socket and extension or with special tool 3122B.
    Replace spark plug and reinstall wire.
    Repeat procedure for remaining cylinders.
    Reinstall sound absorber(s) as required.

    Tightening torque

    Spark plug to cylinder head (all engines) 30 Nm (22 ft-lb)


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