Instead, they tend to be a symptom of another condition. When these fibers tug or pull on the retinal surface, it can cause flashes or light sparks from the friction.įlashes of light in the eye are typically not a condition on their own. Tiny fibers float in the clear vitreous fluid some are attached to the retina’s surface. This means that anything stimulating the retina, including pushing or pulling on the retina, can lead to the transmission of a light impulse – even in a totally darkened room. The retina knows only one “language,” and that’s light. It protects the retina and helps your eye maintain its shape. The vitreous humor is a clear jelly-like fluid that takes up a large part of the back of your eye. The retina’s job is to process the focused light that comes in through your pupil and let your brain convert this information into a picture. It transmits electrical signals to your brain via the optic nerve. Contact the manufacturers of these parts for instructions on how to use an inductive pickup with their systems.The retina is a thin, light-sensitive tissue that lines the back of the inside of your eye. Some ignition systems and/or specialty spark plug wires (solid core wires, racing wires, off- road wires) radiate above normal Electro- Magnetic Interference (EMI) and Radio Frequency Interference (RFI) which can cause improper operation of testing equipment. Try moving the inductive pickup clip to a new location on the plug wire to improve operation. Low spark plug voltage or a faulty spark plug wire may cause the Timing Light to operate erratically. If the timing light flashes, service the No. 1 spark plug is working properly:Ĭonnect the inductive pickup clip to another spark plug cable, and press the On/Off switch. Make sure the inductive pickup clip is properly connected to the No. If necessary, clean the inductive pickup clip as described in MAIN- TENANCE. Make sure the upper and lower ferrite cores of the inductive pickup clip are clean. Make sure the battery clip polarity is correct (red battery clip is connected to the positive ( +) battery terminal, black battery clip is connected to the negative ( –) battery terminal). Make sure the battery clips are firmly connected to the battery terminals. If the timing light fails to operate or operates erratically, make the following checks: Refer to your vehicle's service manual for specifications and procedures.Ī vacuum pump equipped with a vacuum gauge is required to check vacuum retard. The procedures for checking vacuum/electronic retard and electronic advance vary between vehicles and manufacturers. Unplug and reconnect the vacuum hose to the distributor's vacuum port.Ĭhecking Vacuum/Electronic Retard and Electronic Advance Turn off the ignition and disconnect the timing light and vacuum pump from the engine. Repeat the test, as needed, for each amount of vacuum specified by the manufacturer's instructions. Compare this value with the manufacturer's specifications for vacuum advance. The difference between the reading obtained in step 3 (initial (base) timing) and the value obtained in step 5 is the vehicle's vacuum advance. Using the vacuum pump, apply the manufacturer's specified amount of vacuum to the distributor's vacuum port.Īim the timing light at the timing marks and rotate the Advance Control Knob clockwise until the timing marks are realigned to the initial (base) timing mark as recorded in step 3.
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