First you are going to need to take out the number one plug to find TDC (top dead center). To find TDC, you will need to either place a piece of electrical tape over the hole where the #1 plug was or have a helper place their finger over the hole. After that you will need to turn the engine over very gently or in quick bursts until the tape is blown off or your helper feels a quick burst of air from the whole. to wnsure you have TDC, try it a couple of times until you find the exact point where the piston is in its highest position. Once you have found TDC, you can replace the distributor. Make sure that when the distributor is going in you will need to offset the rotor button so it will line up with the #1 plug wire. You may have to try it a couple of times until you get it right. If the distributor does not go all the way down then the oil pump is not lining up. No worries, while the distributor is in and lined up slowly turn the crank until it drops nicely into its place. bolt it up and fire it up. you should be set at this point. Get a timing light and check just to make sure. You can tell if the timing is set right by the sound of the engine.
the 1996 s-10 blazer 4.3 vortec has the computer in the engine compartment on the left hand side....if this is true, you cannot, I repeat, cannot adjust the timing.....the computer adjust the timing....you should be able to read it on the sticker under the hood..... ------- The timing is computer controlled - no way to adjust it, the computer does all of that for you.
There is no adjustment on the timing, It is controled by the computer. If you did not have the distributor out then there is no reason to worry about the timing, Unless the check engine light is on and you had it scanned with a engine scanner and it said that the timing was off. You will then need to hook scanner up to engine and go into the timing mode and move the distributor until the light goes out. Then tighten dist. and the computer will do the rest.
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.
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.
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