Vehicle ignition system Mercedes S-Class (W126)

General information about the ignition system
The ignition system generates an ignition spark for each cylinder at a specific point in time. This causes the incoming working mixture to ignite. In the ignition coil,...

Operation of the transistor ignition system
The transistor ignition system is a contactless ignition system. The ignition distributor is equipped with a maintenance-free inductive sensor. The inductive sensor...

Safety precautions for transistor ignition system
In the electronic ignition system, voltage reaches values of up to 30 kV. Under unfavorable circumstances, such as humidity in the engine compartment, voltage surges can...

Checking the ignition system
If the engine does not start, this may be caused, among other things, by a defect in the ignition system. Connect the voltmeter to the battery terminals. Turn on the...

Checking the ignition coil
The ignition coil can be checked with an ohmmeter. Disconnect the ground cable from the battery. Remove the ignition coil cover. Disconnect the spring with a wide...

Checking the ignition wires
Remove the ground cable from the battery. Remove the distributor cap and pull out the spark plug tip. As a rule, the ignition timing is not adjustable. A stroboscope is...

Checking and adjusting the ignition timing
As a rule, the ignition timing is not adjustable. A stroboscope is required for checking. Warm up the engine to operating temperature: the coolant temperature should be...

Ignition distributor — general information
Ignition distributors in all cars are basically the same, with a centrifugal and vacuum regulator. The vacuum chamber is designed to adjust the ignition timing. To...

Ignition distributor — removal and installation
Removal Disconnect the ground cable from the battery. Pull out the green wire plug on the distributor, having first disconnected the retaining bar. Remove the...

Spark plugs — description and marking
The spark plug consists of a middle electrode, an insulator with a housing and a ground electrode. The ground electrode is hermetically secured in the insulator, the...

Checking the distributor cap
The electronic ignition system is basically maintenance-free, but as part of maintenance it is still necessary to check the connections and spark plugs. Remove the...

Checking electrical connections
Check all electrical connections on the ignition coil and distributor for tightness. Replace cracked terminals. Clean corroded connections with a wire brush or...

Checking spark plugs
Spark plugs should be checked every 10,000 km and replaced every 20,000 km. Platinum plugs generally have a longer service life. They should be replaced when the middle...

Ignition system fault diagnostics
Cause of malfunction Method of elimination No spark. Distributor cap is wet and dirty Clean and dry the distributor cap, spray the inside with a special compound Cracks...

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W140 (1991-1998)