As one expert put it, on a V8 engine, it looks a bit like a rubber octopus! Older vehicles use a distributor that has spark plug cables sprouting out in all directions. In a gasoline engine, ignition timing sends an electric current to each spark plug at precise time intervals and in a predetermined sequence (diesel engines don’t have spark plugs).
If you have the right setup, these tools can also be used for bench testing. Your engine doesn’t have to be in the vehicle to check its timing. We’ve also included a number of recommendations that showcase the variety of high-quality, great-value tools available. To help clarify the important timing light features, we’ve put together this comprehensive buying guide. The not so good news is that if you’re looking to buy your first timing light, the capabilities and jargon can be a bit confusing. All those things add up to excess stress on the engine - and your wallet! The good news is that there are plenty of timing lights to choose from, and something for any budget.
If your spark plug timing is off, all kinds of things can go wrong, from difficulty starting, poor acceleration, and an overall drop in performance to backfiring, strange “pinging” noises, and higher gas consumption. Checking and setting the timing correctly isn’t a complicated job for the home mechanic as long as you have an accurate timing light. That firing is controlled by the ignition timing. In order for your engine to run properly, the spark plugs have to fire at exactly the right moment.
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