You notice your vehicle running rough or you just want to perform a regular tune-up, an advance timing light comes in handy.
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.
Hook up the timing light, connect the inductive pickup to the number one spark-plug wire and the other two leads to the positive (12-volt source) and negative (ground) battery terminals.
Most light units on the market today, however, clip right to the spark plug wire itself.
The battery connections power the advance timing light and by means of the third cable, the induction pickup registering the secondary ignition voltage causes the strobe light to flash.
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By replacing them with lighter springs and different weights (available from several performance manufacturers such as accel), the total advance can be changed to improve performance.
The distributor can be rotated slightly until the reference pointer aligns with the specified point on the timing scale.
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.
Advance the dial until the timing mark is sitting at 0 degrees and then look at the dial.
-injected engines, or engines with microprocessor controls may require special procedures to allow basic spark timing to be observed without control effects from the engine computer.
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Now, when you aim the timing light at the timing marks, you can no longer see them.
Keep in mind that a defective ignition system can cause the timing light to flash erratically.
Choose a timing light from a top seller when possible to ensure you get the best possible customer service.
After completing general engine preparation, clean the timing mark on the harmonic balancer and then mark it with either white chalk or a paint pen.
If it is not within the specified limits, you must then adjust the engine timing.
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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.
Set timing advance when your engine has no degree scale, simply set the advance on this timing light and align the timing mark to the tdc indicator on your engine.
With a good timing light and an understanding of how to set timing, better performance is available at almost no cost.
The apparent position of the marks, frozen by the stroboscopic effect, indicates the current timing of the spark in relation to piston position.
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.
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By manipulating the distributor cap (turning it slightly clockwise or counterclockwise), you can adjust that timing of the spark delivery.
The timing light features an led indicator light to insure proper hookup as well as a rubber nose to protect the unit from damage.
To make things more confusing: sometimes the timing marks are found on the flywheel or even on the fan pulley.
Prepare the engine for timing, you must follow the instructions on the vehicle emissions control label.
To make the necessary adjustments, point the timing light at the balancer and timing marks once more and rotate the distributor until the timing mark is in the specified position.
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1 terminal, mark the housing position to keep initial timing in range after reinstallation, and unhook the holddown clamp and all wires.
Whether you rotate the distributor clockwise or counterclockwise to make your adjustments depends on the type of engine you are working with, and whether the timing is advanced or retarded.
To calculate the total timing of your engine, rev the engine to 3,000 rpms and maintain it there.
You can use more advanced procedures (for instance, adjusting the vacuum timing) to wring even more finely tuned performance out of your vehicle.
Hand-held instruments like this diagnostic tester (right) can be used to show engine rpm while monitoring total ignition timing.
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Rotate the dial on the timing light until you see the timing mark begin to recede on the timing tab.
Be sure to keep some tension on the bolt so that the distributor housing will not easily move after the timing has been set.
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.
Detachable leadsled indicator light insures proper hookuphigh impact abs housingrubber nose protects the unit from damagebright xenon bulb.
Put, a timing light helps to fine tune when the spark fires from the spark plug and ignites your car's fuel.