Originally Posted by joefrontier2
Can you tell me what you did to set your timing? Did you see a different? What was the timing to begin with and what did you have to do change it exactly?
I changed the factory timing from the normal -10 BTDC to -13.5 BTDC originally while living in Colorado, as the thinner air at higher elevation permits a bit more advancement on the timing. The advanced timing can help maximize fuel economy, increase power, and ensure fuel is ignited most efficiently.
Now that I'm back to sea level and after having done the knock sensor bypass, it's imperative to have correct timing because the engine has no way of detecting spark knock, which occurs when the timing is too far advanced. What happens is the spark plug ignites the fuel/air mixture while the piston is still traveling upwards. Very bad things can happen, like holes in pistons.
You can hear the spark knock as a harsh "rattling sound" under heavy throttle, usually at lower RPMs. I was hearing this at times, so I changed the timing to 9 degrees BTDC which is within the factory spec of 10 BTDC +/- 2 degees. It fixed the problem as there is no more pinging.
You just undo the bolt near the distributor cap. After having performed the procedure above (letting the engine warm up, revving it and such), you first shine your timing light down at the arrow that points to the crankshaft pulley. In the crankshaft pulley itself are five notches indicating from left to right 0 - 5 - 10 - 15 - 20. They are not labeled, but the center notch is correct value. The timing light will only light up when the spark plug fires, and it's so quick that it will show you exactly where on those indicators that the spark plug is firing. Then just turn the distributor either clockwise or counterclockwise to change the timing while looking at the notches w/ the light to see what the changes are doing. Find your desired setting, then screw the bolt back down. And you're done.
Hope this helps.