A 1996 Chevy 4x4 with a 5.7L Vortec V8 uses a timing chain, not a belt. This is crucial because the procedure for setting timing is completely different. You don't "reset" a timing chain. If the timing chain is off, the engine won't run, and you have a serious mechanical problem that likely needs professional attention.
Trying to adjust the timing on a chain-driven system like this without the proper tools and knowledge is extremely risky. You could bend valves or cause other serious engine damage.
If your engine is running poorly, here's what you should consider before even thinking about the timing chain:
* Diagnostic trouble codes (DTCs): Use an OBD-II scanner to read any stored codes. This will give you a clue about what's wrong.
* Check the basics: Make sure the battery is charged, all connections are tight, there's enough fuel, and the air filter isn't clogged.
* Ignition system: Check spark plugs, wires, distributor cap (if applicable), and ignition coil.
* Fuel system: Inspect fuel pressure and the fuel filter.
If you suspect a timing chain issue (unlikely to just need a "reset"):
* This is a major repair job requiring specialized tools and expertise. It's best handled by a qualified mechanic.
* A rattling noise from the engine could be a sign of a stretched or failing timing chain, but there are other potential causes for noise.
In short, you need more information to accurately diagnose the problem. Provide more details about the symptoms, and consider taking your truck to a mechanic for proper diagnosis and repair. Attempting a timing chain adjustment without sufficient mechanical knowledge is strongly discouraged.
