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Rant: Timing a diesel by sound feels like a lost art now | Diesel Mechanics - Thought Shares

Rant: Timing a diesel by sound feels like a lost art now

I remember when we timed engines just by listening. Now, everyone uses scan tools. But here's a tip: if your scanner says timing is off, try listening for the knock. It can save you from replacing parts that are fine. Old skills still come in handy, like last week when I caught a bad sensor this way.

4 comments

4 Comments

josephadams7mo ago

Those scan tools exist for a reason. Modern engines have way too many sensors for your ears to figure out. You'll miss something just listening for a knock.

wren6386mo ago

That story about the 7.3 Powerstroke is exactly why this stuff matters. It's so easy to just trust the computer readout and start throwing expensive parts at a problem. But sometimes the computer is getting lied to by a cheap sensor, and your ears know the real sound of a healthy engine. Keeping that old skill alive doesn't mean you ignore the scanner, it just gives you a second opinion that can save a ton of money and headache.

the_harper7mo ago

Seriously, my buddy has an old 7.3 Powerstroke. His new scanner kept showing a wild timing error code. He was about to order a whole new injector pump setup. But his dad came over, listened for about thirty seconds to that classic diesel rattle, and pointed right at the valve cover. Turns out it was just one stupid glow plug sensor giving the computer a fake reading. Saved him over a grand in parts he didn't need.

wade_wells7mo ago

Man that hits home. My neighbor's Duramax was throwing a code for a bad injector, had the whole shop ready to pull the engine apart. I was over there drinking a beer when he showed me the scan tool readout. Told him to check the wiring harness by the firewall first, sure enough it was rubbed raw and shorting. Fixed it with some tape and a new connector.