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CARQUEST by BWD is an aftermarket leader, providing a premium line of engine management products. Cam 88 engine use low primary resistance (about .5 ohms) and are manufactured by the same company (Marshall). The high voltage flows through the coil high tension lead to the distributor cap where the rotor distributes it to one of the spark plug terminals in the distributor cap.
The following procedures can be used to determine whether the ignition system is working or not.
Special ToolsTo perform the following tests, two special tools are needed; the ignition test jumper shown in the illustration and a modified spark plug.
With the ignition off, turn the engine over by hand until one of the teeth on the distributor armature aligns with the magnet in the pickup coil. In the harness side of the connector(s), connect the special test jumper (see Special Tools, above) between the leads which connect to the green and black leads of the module pig tails. If there is no spark, the problem is probably in the primary circuit through the ignition switch, the coil, the green lead or the black lead, or the ground connection in the distributor; Perform STEP 3. If there is no spark, the problem is probably in the green lead, the coil, or the coil feed circuit: perform STEP 5. If there is spark, the problem is probably in the black lead or the distributor ground connection: perform STEP 4. Disconnect the test jumper from the green lead and ground and connect it between the TACH-TEST terminal of the coil and a good ground to the engine.
Connect a voltmeter between the orange and purple leads on the harness side of the module connectors.


On catalytic converter equipped vans, disconnect the air supply line between the Thermactor bypass valve and the manifold before cranking the engine with the ignition off. CARQUEST customers can now take advantage of all Advance online promotions, plus enjoy the convenience of ordering online and picking up at their nearest CARQUEST store, or shipping to home. BWD manufactures and distributes high technology critical components for late model domestic and import vehicles. When the armature spokes approach the magnetic pickup coil assembly, they induce the voltage which tells the amplifier to turn the coil primary current off. Install the modified spark plug (see Special Tools, above) in the coil wire terminal and using heavy gloves and insulated pliers, hold the spark plug shell against the engine block. With the meter on its lowest scale, there should be no measurable resistance in the circuit. If the meter does not oscillate, check the circuit through the magnetic pick-up in the distributor for open, shorts, shorts to ground and resistance. To mark this measurement, it will be necessary to pierce the red wire with a straight pin and connect the voltmeter to the straight pin and to ground. Install the modified spark plug mentioned under Special Tools, above, in the coil wire and ground it to engine metal either by its spring clip (Spark Tester) or by holding the spark plug shell against the engine block with insulated pliers.
If there is good spark, the problem is probably in distributor cap, rotor, ignition cables or spark plugs.
A timing circuit in the amplifier module will turn the current on again after the coil field has collapsed.
Circuit failures may be caused by shorts, corroded or dirty terminals, loose connections, defective wire insulation, cracked distributor cap or rotor, defective pick-up coil assembly or amplifier module, defective distributor points or fouled spark plugs.If an engine starting or operating trouble is attributed to the ignition system, start the engine and verify the complaint.
If the boots or nipples are removed on 8mm ignition wires, reline the inside of each with new silicone dielectric compound (Motorcraft WA-10). The problem is probably in the distributor pick-up, the module red wire, or the module: perform STEP 6. If there is resistance, check the distributor ground connection and the black lead from the module.
After testing, run the engine for at least 3 minutes before reconnecting the bypass valve, to clear excess fuel from the exhaust system. Resistance between the orange and purple leads should be 400-1,000 ohms, and between each lead and ground should be more than 70,000 ohms. To mark this measurement, it will be necessary to pierce the white wire with a straight pin and connect the voltmeter to the straight pin and to ground.


If the readings are not within 1 volt of each other, check and repair the feed through the ignition switch to the coil. When the current is on, it flows from the battery through the ignition switch, the primary windings of the ignition coil, and through the amplifier module circuits to ground.
On engines that will not start, be sure that there is gasoline in the fuel tank and the fuel is reaching the carburetor. If the readings are within 1 volt of each other, the problem is probably in the ignition module.
When the current is off, the magnetic field built up in the ignition coil is allowed to collapse, inducing a high voltage into the secondary windings of the coil. Ford makes a special tool called a Spark Tester for this purpose, which besides not having a side electrode is equipped with a spring clip so that it can be grounded to engine metal. If there is no spark, the problem is probably in the primary circuit running through the ignition switch to the coil BAT terminal, or in the coil itself.
The battery voltage and the voltage at the white wire should be within 1 volt of each other. Check coil resistance (test given later in this section), and check the coil for internal shorts or opens. If the readings are not within 1 volt of each other, check and repair the feed through the ignition switch to the white wire. When DuraSpark is used in conjunction with the EEC, the EEC computer tells the DuraSpark module when to turn the coil primary current off or on. In this case, the armature position is only a reference signal of engine timing, used by the EEC computer in combination with other reference signals to determine optimum ignition spark timing.
If the readings are within 1 volt of each other, or if there is still no spark after the power feed to white wire is repaired, proceed to Step 4.
Check for an open or short, repair as necessary, reconnect all connectors and repeat STEP 1.



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