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Ignition Timing R. Bortignon.

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Presentation on theme: "Ignition Timing R. Bortignon."— Presentation transcript:

1 Ignition Timing R. Bortignon

2 What is Ignition Timing?
ignition timing determines when the spark occurs in relation to piston/crankshaft position ignition timing is stated in degrees of crankshaft rotation TDC = Top Dead Center BTDC = Before Top Dead Center ATDC = After Top Dead Center ignition timing adjustment must be set correctly for best vehicle performance, fuel economy & lowest emission levels ignition timing is not the same procedure as valve timing on vehicles with distributors, ignition timing should be checked & readjusted during tune-ups & after the distributor has been removed & reinstalled from the engine timing can only be adjusted on vehicles with distributors! vehicles with DIS or direct ignition has the timing controlled by the computer and is not adjustable

3 How to Check & Adjust Ignition Timing
connect the timing light to the spark plug wire on cylinder #1 timing light flashes every time #1 spark plug fires timing specs can be located in the under-hood tune-up decal or in Mitchell/Alldata

4 Follow timing preparation procedures…
this prepares the engine for ignition timing refer to the under-hood tune-up decal engine at normal operating temperature vacuum advance disconnected? correct idle speed computer controlled engines disable computer’s influence on timing

5 Checking & Adjusting the Timing
clean & paint the timing scale & notch (with engine off)

6 Adjusting the Timing slowly rotate the distributor while the engine is running until the marks are aligned tighten distributor hold-down bolt then re-check timing


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