And sometimes the indicators are reversed. To make things more confusing: Sometimes the timing marks are found on the flywheel or even on the fan pulley. By manipulating the distributor cap (turning it slightly clockwise or counterclockwise), you can adjust that timing of the spark delivery. The strobing timing light "freezes" the motion of the pulley and allows you to see how many degrees before or after TDC the spark is firing. The engine has a mark right next to the pulley that represents TDC. On some vehicles, the crankshaft pulley has a bunch of degree marks and numbers on it. The degrees refer to how far the crankshaft has rotated relative to the Number 1 cylinder's piston at top dead center (TDC) of the compression stroke. Instead, the timing of the spark is measured in terms of degrees. Obviously, you don't see the actual piston's location. Through a phenomenon known as the stroboscopic effect, a properly aimed timing light will indicate where the Number 1 piston is in its up-and-down travel when the spark fires. When you pull the trigger of the timing light (with the engine running), each time the Number 1 plug fires, the timing light flashes a beam of light. These inductive timing lights are able to detect the jolt of electricity each time the spark plug fires, similar to a doctor using a stethoscope to determine your body's pulse. Most light units on the market today, however, clip right to the spark plug wire itself. With a few of the timing lights out there, you might have to attach the unit's spark signal pick-up wire directly to the spark plug tip.
#TIMING LIGHT AUTOZONE MANUAL#
(If you're not sure which is the "Number 1" spark plug wire, stop! And get thee to a service manual or online owners' forum for your vehicle.) Lastly, you take the signal wire and clamp it directly to the Number 1 spark plug wire. With the engine off, you merely clamp the timing light's red wire to the battery's positive terminal, then the black wire to the battery's negative terminal. Getting your timing light ready for action is breathtakingly simple. That is, as long as your car runs and is connected to a working 12-volt battery. One cool thing about timing lights is that unlike a flashlight, you never have to worry about running out of juice to power the light. Newer cars with distributorless ignition systems use a computer to control the ignition process.) (This information, by the way, applies to mostly older vehicles, which use a distributor to send electrical energy to the spark plugs. More importantly, the more expensive the timing light is, the more likely it will be easier to read even in bright conditions. But most people would probably prefer the much cooler, ray gun-shaped, "pistol grip" variety.because they're more ergonomic inside the close confines of a car's engine bay (yeah, that's it). The simplest and least expensive timing lights fit into a basic pen shape. And who doesn't want that?įirst, you should know that timing lights come in a few different shapes and sizes, and range in features from bare-bones functionality to lots of bells and whistles. Properly adjusted timing, in turn, helps to make sure your engine works at peak power and efficiency. Whether it's motor oil, car batteries, brakes, or headlights for quick easy DIY jobs, or a more complex project like replacing your vehicle's head gasket or exhaust pipes, you'll find everything you need right here at Pep Boys.Simply put, a timing light helps to fine tune when the spark fires from the spark plug and ignites your car's fuel. Quickly and easily search for the parts you need based on the year, make, and model of your vehicle. Pep Boys carries the OEM and aftermarket parts and accessories you need to repair, maintain, or customize your vehicle. We know there's more to driving than keeping your vehicle running. Price Match PolicyThe purpose of the Pep Boys Price Match Policy is to ensure that we are the automotive solutions provider of choice for the value-oriented customer, putting the customer first by offering the best value available.įor retail: We will match any local competitor's advertised or every-day price, on any comparable merchandise normally stocked as active in our stores' inventory or outside purchase, within 30 days of purchase with the original receipt.įor tires: We will match any local competitor's advertised or every-day price, on comparable tires within 90 days of purchase with the original receipt.įor service: We will match a local competitor's advertised or every-day price, on comparable automotive services utilizing comparable merchandise.Ĭar & Truck Replacement PartsPep Boys carries the parts you need to keep your car or truck running for years to come.
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