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find the distributor and at the bottom of it there is a bolt that you loosen that loosens the hold down plate that keeps it tight against the engine block, once you loosen the bolt the distributor will turn right or left, start the engine and then slowly turn the distributor one way or the other until you hear the engine RPM increase, when it increases you are advancing the timing.
Your mechanic has put the distributor in wrong or he has the plug wires on the cap wrong.
The way the rotor rotates retards. If the distributor turns clockwise, then turning the distributor clockwise retards the timing.
By advancing or retarding the spark.
To set the timing on a Toyota 22R engine find the distributor. The engine will have marks at which the distributor can be set. The OEM setting for a 22R engine is 5 degrees.
To advance ignition timing, loosen the distributor clamp and in very small increments turn the distributor body in the OPPOSITE direction of the rotor's normal rotation. If you don't know which way the rotor turns, you can find out easily by removing the distributor cap and having a helper turn the engine over with the ignition key switch. To advance the timing turn the distributor counter clockwise.
The difference between increasing the horsepower by advancing the timing, and advancing the timing to where it causes severe pre-ignition and engine damage is so slight it isn't worth considering. As an "increasing horsepower" idea, it is best left at the starting gate.
Put the engine at top dead center cylinder #1 by removing the plug and bringing the piston to the top. Mark the balancer and timing cover where ever is easier to see. Use an advancing timing light set at 10* and turn the distributor until both marks meet.
The 4.3L V6 GM engine does not have a timing belt it has a chain, and it does not directly drive the distributor.
If you have the 3.8L engine, ignition timing is controlled by the computer and cannot be altered without making changes to the computer. If you have the 3.1L engine, which has a distributor, you can set the timing as you would on any engine with a distributor.
The timing on that engine is controled by the computer. You can not use a timing light. The only thing you can do is move the distributor enough to get the engine to run and have power and that is called the base timing. When it does run and the engine light is not on then you got lucky, but if the check engine light comes on, then you will have to get an engine scanner and hook it up and go into the timing mode and move the distributor until you get the cam and crank in time. The scanner will show you when it is in time and the engine light will go off. Tighten distributor and your done. The computer will do the rest.
Distributor timing is adjusted by rotating the distributor. A scan tool is required to put the engine computer in distributor sync mode. The distributor is then set to zero degrees.