Solid core and some special application aftermarket spark plug wires can cause improper operation of the timing light. However, it may be necessary to move the timing light andlor inductive pickup a short distance away from sources of EMI if the display reading or light functions improperly. The MT2261A is internally shielded to help eliminate EMI (electromagnetic interference, which includes RFI, radio frequency interference) produced by alternators, battery cables, electric motors, spark plug wires, etc. Add this 1° or 2° at the timing mark for actual timing reading. The fluctuation can be eliminated by entering 1° or 2° of timing light advance. This may also occur at higher engine speeds (above 1930 RPM), but is more evident on engines running poorly, idling slow, equipped with light weight flywheels, and those built for racing applications. When checking timing on engines with low or unstable speeds, timing marks may fluctuate. If dwell is adjustable (distributor points) it should be checked and adjusted to specification prior to timing checks or adjustments. Engine may be considered at normal operating temperatyre when upper radiator hose is hot. For accurate test results, engine should be at normal operating temperature. NOTE: Some vehicles that are equipped with compllterized engine control systems may not have a timing procedure or specifications and manufacturer may just state "NONADJUSTABLE". Locating this information in a manual will require some or all of the following data: year of manufacture, vehicle indentification number (VIN), engine displacement, type of transmission, and whether it is equipped for Federal or California emission standards. MT2261A Computerized Tach/Advance Timing Light a Vehicle Emission Control Label, refer to a reliable service manual. If a vehicle's timing procedure and specification are not readily available on 3 Procedures and specifications may vary from vehicle to vehicle, even if they are of the same manufacturer, year, vehicle model, engine, etc. Always refer to applicable manufacturer's test procedures and specifications before testing vehicle. Dry with air hose, keeping nozzle at least 6" away.ģ. Spray surface with plastic tube tip 1" away. Clean with CRC Lectra - Motive 05018 Cleaner or equivalent. Occasionally inspect the inductive pickup for dirt or other foreign matter buildup on the ferrite cores. Dropping or sharp blows can damage the ferrite cores. CAUTION: Do not allow core pieces to contact metal objects. If the MT2261 A fails to operate, check power leads for good connections and the proper polarity, make sure inductive pickup jaws are firmly seated and that latch is in the lock position, and inspect inductive pickup's ferrite cores for cleanliness and damage. If the battery terminals are difficult to access, an auxiliary battery may be used, or you can connect the positive lead to the alternator output terminal and the negative lead to a good vehicle ground.Ģ. If the test vehicle has a different electrical system (6 or 24 volt system, etc), an auxiliary 12 volt battery may be used to power the timing light. The MT2261 A Computerized Tach/Advance TIming Light can be powered by a negative or positive ground 12 volt DC power source. (Reset) automatically zeroes degrees of advance that have been entered with the ~ (Increase) key. Pressing ->-(Decrease) when display reads "0" sets timing light to 180 It operates in the same manner as the ~ (Increase) key. ~ (Decrease) decreases degrees of timing light advance that have been entered. After key is depressed one second, the MT2261 A begins rapid advance. (Increase) increases degrees oftiming light advance up to 180 (Flash) is an "ON-OFF" switch for the flash function. CONTROL PANEL has the following five function keys: ( i, )lj (Tach/Advance) is depressed to select tachometer "Err" will be displayed if RPM exceeds 9990. LED DISPLAY displays engine speed from 0 to 9990 RPM and timing degrees from O Its signal controls the light flashes and is used for computing the RPM and timing reading. INDUCTIVE PICKUP clamps over #1 cylinder spark plug wire (usually - see Equipment & Testing Tips #10) to monitor high voltage surges. Red lead connects to positive (+) terminal of 12 volt battery and black to a good vehicle ground. Oįunctional Description POWER LEADS have color-coded clip boots. Specifications Operating Temperature Range. (Reset) is also used to clear and restart the timing light if erroneous data is displayed. Is displayed momentarily when / / (Reset) is pressed. MT2261 AComputerized Tach/Advance Timing light MT2261 Computerized Tach/Advance Timing light MT2261A Computerized Tach/Advance Timing Light
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