Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1994 Audi S4FACTORY OEM SERVICE PROCEDURE
Spark Test
WARNING:
During the test, DO NOT touch ignition coil mounting bracket or spark plugs. There is a danger of electrical shock.
- Remove screws from ignition coil mounting bracket (arrows). See Fig 1 . Remove spark plugs. Disconnect harness connectors from all 5 fuel injectors.
- Install spark plugs in the spark plug connectors (if necessary, use new spark plugs) and place on the cylinder head cover as shown in the illustration. See Fig 2
. Operate starter and check for spark at spark plugs.WARNING: During the test, DO NOT touch ignition coil mounting bracket or spark plugs. There is a danger of electrical shock.
- If there is weak or missing spark on one or more of the spark plugs, repeat test using other spark plugs.
- If spark is still unsatisfactory, see IGNITION SYSTEMS in SYSTEM & COMPONENT TESTING article.
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.