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
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