Vehicle ignition system Audi 100 C4, petrol

What can ignition
In order for a spark plug in the combustion chamber to spark at all, there must be a voltage of at least 30,000 V between the spark plug electrodes. The...

When does ignition occur?
The spark should jump right at the right time. However, it is not so easy to establish when this most necessary moment will be. Combustion will be most...

Various ignition systems
The ignition system is an integral element of the electronic engine system in almost all Audi-100 models. But what looks complex on paper is actually...

This is how a spark is born
The basic principle of ignition is that the current from the battery is first supplied to the primary winding of the ignition coil. This winding consists of...

Executive agency
Electronic transistor switch The electronic switch contains a powerful transistor that turns the current supply to the ignition coil on and off (or ignition...

The «brain» of the system
Control block For most engines, the ignition system control is integrated with the injection system control. The only exceptions are models with a 5-cylinder...

Impulses for the control unit
Hall Sensor The switching on and off of the current to the ignition coil mentioned in the section is provided (passing also through the control unit and the...

Knock control
Except 74 kW motors Knocking combustion that occurs if the ignition timing has been moved too far to the side «ignition timing», damages the engine. The...

Safety measures when working with the ignition system
In the engine compartment of the Audi-100, a special plate warns of high voltage in the ignition system, and this is not at all unreasonable: voltages of up to...

Repair of the ignition system
«Shutdown» ignition systems The control unit or the electronic switch of the ignition coil will certainly be damaged if, with the high-voltage cable removed,...

Diagnostics of the ignition system
Anyone who wants to find a malfunction in the ignition system must act on the system. By a simple test of the secondary voltage, it can be ascertained whether...

Ignition distributor
The ignition distributor is in a certain sense of the word two-level. Each level has different activities: In the high-voltage element, the distributor slider...

Detonation combustion sensor
Except 74 kW motors Checking the knock sensor is carried out by polling the memory of the fault memory (see also chapter « Regular maintenance »). There are no...

High voltage elements
High voltage wires The high-voltage part of the ignition system includes, along with the ignition coil and distributor - they have already been discussed -...

Replacing spark plugs
MOT No. 36 The maintenance plan calls for the replacement of spark plugs every 30,000 km. This interval seems real to us and it is not worth extending it. It...

Spark plug
Spark plug designations With the designations shown in the table on the next page, you will get the right spark plug for your vehicle. What is behind the...

Ignition timing check
MOT No. 6 The moment of ignition, in fact, in the electronically controlled ignition systems of the Audi-100 cannot go astray. The workshop also controls the...

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100(C4, 1990-1994)

100(C4, 1990-1994, petrol)

100(C3, 1982-1990)

100(C3, 1982-1990, petrol)

100(C3, 1982-1990, diesel)