The replacement procedure is the same for all spark plugs.
Please note: all work on the car – AUDI 100 (4A, C4) – should be done with the engine switched off.
Carry out replacement in the following order:
Step 1
Open the hood.
Step 2
Use a fender protection cover to prevent damaging paintwork and plastic parts of the car.
Step 3
Disconnect the spark plug wires from the spark plugs. Use pincers.
Replacement: spark plugs – AUDI 100 (4A, C4). Tip:
Be careful to avoid damaging spark plug wires.
Step 4
Clean dirt, dust and debris from inside the spark plug wells.
Step 5
Unscrew the spark plugs. Use the spark plug socket #21. Use a ratchet wrench.
Step 6
Take out the spark plugs.
Step 7
Apply a thin layer of a special high temperature anti-seize lubricant to the threads of the new spark plugs.
Step 8
Install the new spark plugs into their mounting seats. Use the spark plug socket #21.
Step 9
Screw new spark plugs and tighten them. Use the spark plug socket #21. Use a torque wrench. Tighten it to 25 nm torque.
Replacement: spark plugs – AUDI 100 (4A, C4). Tip from AUTODOC experts:
Don't tighten the plugs with excessive force. Exceeding tightening torque can damage the thread connection. Be careful when working with a spark plug wrench. Its skewing can cause damage to the threaded connection.
Step 10
Connect the spark plug wires to the spark plugs.
Replacement: spark plugs – AUDI 100 (4A, C4). Professionals recommend:
Follow the installation sequence.
Step 11
Run the engine for a few minutes. This is necessary in order to make sure that the component operates properly.
Step 12
Shut off the engine.
Step 13
Remove the fender protection cover.
Step 14
Close the hood.
Was this manual helpful?
Please rate this manual on a scale from 1 to 5. If you have any questions, feel free to ask us.
It can track car expenses, keep a car log and replacement schedule, and save favourite materials, notes and documents
Install the AUTODOC CLUB app!
Your personal car expenses manager, maintenance tips, reminders about upcoming appointments and service intervals, DIY repair instructions – all this on your phone.
Scan
To download the app:
- scan the QR code
- download from App Store
- download from Google Play
Tips & tricks for your AUDI 100 Saloon (4A2, C4)
View more
How to swap the engine on a BMW E30 Turbo | SUPERCAR AUTODOC
How to find and change a fuse | AUTODOC
Car checks you need to carry out on your car after the winter | AUTODOC tips