High voltage wire
Usually thick high voltage wires from the ignition coil to the spark plugs (or to the distributor) cause no problems.
They must be firmly inserted with their anti-interference plugs (against radio interference) into the sockets of the cover of the ignition distributor or ignition coils. Their plug connectors must not be oxidized, and they must have good contact with the plug connectors.
If the high voltage wire has become hard and brittle, then you must put in a new wire. They are sold for all motor assemblies with the appropriate connectors.
Audi cannot use any type of spark plug connector. The connectors must have an internal resistance suitable for the ignition system.
Adviсe: «Leaky» areas on the high voltage wire are easy to detect if you look into the engine compartment at night with the engine running. Then the spark jumping on the wire is clearly visible. On the contrary, weak light flashes do not cause concern, «fleeing» along the wire.
If the engine constantly or occasionally (in wet weather) not all cylinders work, the reason is sometimes in defective plug connectors. There, through the insulating material, spark breakdowns occur between the metal sheath and the high voltage electrode. Most often, the candle connector is not visible whether it breaks through or not. To check, replace the spark plug connector with another one. Temporary travel aid: remove the metal shield of the connector.
Ignition sequence
For balanced engine operation, the fuel-air mixture ignites in the cylinders not in a row 1-2-3-4 (-5-6), but interspersed. According to this ignition sequence, the ignition wires are inserted into the distributor cap of the 1.6L engine. If the distributor finger, with the distributor cap and dust cover removed, indicates a mark on the edge of the housing, then the ignition moment falls on the 1st cylinder (the first one along the way).
Our engines have the following ignition sequence:
Four-cylinder engine: 1-3-4-2. The distributor finger in the 1.6 liter engine rotates to the right (clockwise). In the 1.8L 92kW engine, the ignition coil for cylinder 3 also supplies power to cylinder 2 via the high voltage wire. The ignition coil of the 4th cylinder also supplies power to the 1st cylinder via a high voltage wire. With the 1.8 liter engine and 110 kW, there is no danger of confusion due to separate ignition coils.
Six-cylinder engine: 1-4-3-6-2-5. There is no ignition distributor - the location of the high voltage wire connectors on the ignition coil pack corresponds to the location of the cylinders. Example: The high-voltage wire in the connection point at the rear right goes to the cylinder at the rear right.
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