High voltage wires
The high-voltage part of the ignition system includes, along with the ignition coil and distributor - they have already been discussed - also high-voltage wires, wire lugs with an interference suppression resistor and, of course, spark plugs.
Thick connecting wires from the ignition coil to the distributor or from the distributor to the spark plugs (models with 6-cylinder engine without distributor), usually don't cause any problems. They must be firmly inserted with their lugs with interference suppression resistors (radio interference elimination) into the ignition distributor cover. Their plug connections must not be oxidized and they must have good contact with the spark plug tips.
TDC - the position of the ignition distributor: the contact board of the distributor slider must be opposite the mark on the edge of the housing (arrow). The mark is visible when the dust cover is removed.
If high-voltage wires become rigid and brittle, new ones should be installed. For a 6-cylinder engine, they can be bought complete with both plugs.
For 4- and 5-cylinder engines, you need to purchase the required piece of high voltage wire and the related brass terminals for the cable ends from the parts store. Squeeze the brass terminals at the ends of the cable, put on the tips of the spark plugs and the tips with interference suppression resistors until they are fixed.
Clue: «leaky» places in high-voltage wires can be easily seen if you look into the engine compartment at night with the engine running. Then the ignition sparks that jump on the cable are clearly visible.
Candle tips, tips with interference suppression resistors
Audi can only use certain spark plug tips. Suitable tips should have a self-resistance of 4-6 kOhm.
The same applies to tips with interference suppression resistors installed on the connections of the distributor and the ignition coil. Their own resistance should be 0.6-1.4 kOhm.
The ignition distributor runner must also have a certain noise suppression resistor of 0.6-1.4 kOhm. It is labeled «R1».
Hint: if the engine constantly or occasionally (in wet weather) does not work on all cylinders, this can often be due to faulty spark plug tips. There, a spark escapes through the insulating material between the metal sheath and the high voltage electrode. To check, replace the tip of the candle with another one. Help on the road: remove the metal shield of the plug.
Ignition order
For smooth operation of the engine, the cylinders, for example, of a 4-cylinder engine, are not ignited in the order 1-2-3-4, but in a certain sense of the word randomly. According to the order of ignition, high-voltage wires are connected to the cover of the ignition distributor. If the distributor slider with the distributor cap removed and the dust cover removed points to the mark on the edge of the distributor housing, then cylinder 1 (first in direction of travel) is at the point of ignition. This is the starting point when putting on the wires.
Ignition order (the order of the cylinders) in our engines is:
4-cylinder engine: 1-3-4-2, distributor runner rotates to the right (clockwise).
5-cylinder engine: 1-2-4-5-3, distributor runner rotates to the right (clockwise).
6-cylinder engine: 1-4-3-6-2-5. There is no distributor - the order of connecting high voltage wires to the ignition coil pack corresponds to the order of the cylinders. Example: A high-voltage wire from a connection at the rear right leads to a cylinder at the rear right.
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