Originally Posted by Loki
What is engine timing ?
How does it effect the proper running of an engine?
What are the signs of a truck being out of time ?
Does engine timing effect gas mileage ?
Engine ignition timing is when the plugs fire versus where the piston is on the compression stroke. It can cause all sorts of problems, but if the distributor is in there good and tight, I would think that the timing hasn't moved.
You'll need a timing light to check it. Pull the SPOUT connector
Start the engine up and watch the timing pointer against the engine balancer with the timing light on plug wire #1 (front left cylinder)
Mark the line I have marked in red on the engine's front pulley (10BTDC) with a fine point marker to help with the timing procedure. You can typically get away with 12 degrees for slightly better performance, but if you hear any spark knock, you'll want to bump it back down.
To adjust the timing, you loosen the distributor and turn it until you get the correct amount of degrees of base timing.
I would start with a basic tune up, plugs, wires, rotor, cap, fuel filter. Would be helpful to do a fuel pressure check to test the fuel pressure regulator as this can be the cause of too much fuel getting into the engine, either by it not regulating the fuel correctly (too high) or it simply has ruptured (common problem, check for gas in vacuum line after truck has been ran).
And be sure to pull codes from the computer.
Once you're done, put the SPOUT back in. This essentially prevents/allows the computer to advance the timing.