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Timing poser

Question : WHILE timing my Toyota Corolla with a timing light, I noticed that the advance mark did not move when I revved the engine.

What could be wrong?

Answer : This is a common problem with older cars using distributors. Most of the time when mechanics service the ignition system, they neglect to check if the mechanical advance is working properly and very often through wear and tear, lack of lubrication and corrosion the advance shaft in the distributor seizes up, causing no spark advance.

Take the distributor cap off and manually move the rotor. It should move and spring back.

If this does not happen, the distributor must be removed, disassembled, freed up and lubricated.

Be careful when you remove the distributor and make sure you have the rotor position marked or else on replacement, you will have a nightmare trying to get the timing correct.

On cars with electronic ignition systems, the computer controls the advance and there is no mechanical advance in the distributor.

 
 

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