![]() ![]() And if the distributor shaft does not rotate, the computer will not receive the position sensor signals and the ignition system will not work to produce spark.ĬASE 3: You got NO spark and the distributor rotor DOES turn. A broken timing belt won't rotate the camshaft and by extension, the distributor rotor. The camshaft is rotated by the crankshaft via the timing belt. How? Well, the distributor is physically connected to the camshaft. Here's why: The crankshaft rotates the distributor rotor via the timing belt. ![]() This is the result of a timing belt that has broken. Confirmed that the ignition coil is sparking.ĬASE 2: You got NO spark and the distributor rotor DOES NOT turn.Confirmed that none of the spark plug wires are sparking (TEST 1).With this test result you can conclude that the distributor cap and distributor rotor are bad if you have: It lets you know that the ignition coil is good and that the timing belt is not busted. The car cannot/should not be cranked without the ignition coil being grounded by a spark tester.ġ.) Spark and the distributor rotor turns.Ģ.) No spark and the distributor rotor DOES NOT turn.ģ.) No spark and the distributor rotor DOES turn.ĬASE 1: You got spark and the distributor rotor turns. It's important that this test be done with a spark tester attached to the ignition coil. IMPORTANT: This test requires that the ignition coil be tested with the distributor cap off of the distributor. If the ignition coil does not spark, then the next step is to make sure that the ignition coil is getting power (TEST 4). If the ignition coil's tower sparks, then we can conclude that that the distributor cap and rotor are bad are behind the no-spark test result from all of the spark plug wires. In this test section, we're gonna' remove the distributor cap and test the ignition coil's tower for spark. TEST 3: Testing For Spark Directly On The Ignition Coil This corrosion increases the resistance to spark and over time (as more corrosion is created) this same corrosion stops the spark from passing thru' to the spark plug wires. Here's why: As the distributor cap ages, the terminals that transmit the spark to the spark plug wires corrode. Replace the distributor cap and rotor with a new set. Confirmed that the distributor cap tower you just tested for spark DID NOT spark.Confirmed that some but not all of the spark plug wires sparked in TEST 1.You can conclude that the distributor cap is bad if you have: spark plug wires don't last forever, especially after-market ones (average life-span is 3 to 4 years).ĬASE 2: The spark tester DID NOT spark. This will either cause a misfire, or a lack of power, or a no-start condition. Here's why: As the spark plug wire ages, its normal resistance to spark increases to the point that the wire can not and does not transmit the spark to the spark plug. Replace all of the spark plug wires with a new set. Confirmed that the spark plug wire that connects to that tower DID NOT spark in TEST 1.You can also conclude that the spark plug wire is bad (that connects to that tower) if you have: This is the correct and expected test result. ![]()
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