The timing chain on your 1999 chev s-10 4 cylinder engine was rattling quite some time then it went out truck died and realize the at first when these go does do exte?

When a timing chain on a 1999 Chevy S-10 4-cylinder engine fails, it doesn't usually go suddenly without warning. The rattling you heard was the chain stretching and slapping against the timing cover. As it continues to fail, the timing is increasingly off, leading to a misfire and eventually a complete engine stop.

What happens *before* complete failure often includes:

* Rattling noise: This is the most common early symptom, worsening over time.

* Rough running: The engine may run poorly, misfire, or hesitate, especially at idle or under load.

* Reduced power: The engine may lack power or struggle to accelerate.

* Check engine light: The light might illuminate, indicating a misfire or other problem related to the engine's timing.

The "extending" you mention is likely referring to the timing chain's slack increasing over time. It doesn't "extend" in length like a rubber band, but the components wear, allowing the chain to move around more freely and ultimately jump timing. This jump is what typically causes a complete engine failure.

Once the chain is completely out of time: the pistons and valves can collide, causing catastrophic internal engine damage. This can be very expensive to repair. This collision is what happens when the engine simply dies suddenly after a period of rattling. The damage can range from bent valves to cracked pistons or even a hole in the engine block.

In short: The rattling is a clear warning sign. Ignoring a rattling timing chain can lead to significant, and costly engine damage. If you hear a rattling noise from your engine, especially one that's related to timing, it needs immediate professional attention.