Motorola GM Series Kurulum Kılavuzu - Sayfa 32

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4.2

Ignition System Interference

4.2.1

Engine Maintenance and Tune-Up

The most important step in reducing ignition noise is insuring that the engine is in proper tune. Pay

particular attention to the following points if the noise interference from the ignition system is severe:

Be sure the spark plugs distributor points, and condenser are in good condition.

Be sure ignition timing is properly adjusted.

Be sure the distributor cap and rotor are in good condition. They should be replaced at least

every 30,000 miles.

Be sure that spark plug wires make good, solid contact at each end and are routed as far as

possible from low voltage leads.

Many late-model automobiles are equipped with a shield over the distributor points. Check to

see that this shield is properly positioned and securely attached.

4.2.2

Available Noise Reduction Kits

Motorola offers two noise reduction kits: Model TLN8845_ for alternator-equipped vehicles; Model

TLN6252_ for generator-equipped vehicles. These kits are for suppression of noise in the primary

and secondary of the ignition coil and for bleeding of static charges on the hood. The TLN6252_

also is used to suppress noise from the generator and voltage regulator. Figure 2-3 TLN8845_

Noise Reduction Kit for Alternator-Equipped Vehicles and Figure 2-4 TLN6252_ Noise Reduction Kit

for Generator-Equipped Vehicles show the contents of the kits and their usage.

Motorola also offers wheel static collectors (Motorola Part No. 0100534254-regular type and

0100563173-small type). Use of these items are described in section "4.7 Wheel Static" on page 12.

Most auto parts dealers can supply 0.05 µF bypass capacitors (condensers), resistive ignition wires,

and resistor spark plugs. The type of spark suppression used in noise reduction should always be in

accordance with the recommendations of the vehicle manufacturer, that is, if spark plugs are to be

replaced with built-in suppressor types, they should be in the proper heat ranges and thread sizes

for the particular engine. In each ignition system, there is a maximum amount of resistance that may

be connected between the distributor and a spark plug. If resistance-type ignition wire is used, the

length of each wire must be limited so that its resistance does not exceed the allowable maximum.

4.2.3

Ignition Coil Interference

This type of interference is characterized by a popping sound which is most noticeable when the

engine is running slowly. To suppress the noise, connect a 0.1 µF coaxial capacitor (Motorola Part

No. 0882571B02) from the battery side of the ignition coil to vehicle ground (see Figure 2-5 Ignition

Coil Noise Suppression). This keeps the distributor noise from being conducted through the battery

lead into the electrical system of the vehicle. Note that some electronic ignition systems do not route

the battery lead to the ignition coil; proper operation of the ignition system can be impaired if the

"input" terminal is bypassed.

REDUCING NOISE INTERFERENCE