Heard a guy at the truck stop in Billings say his injectors were 'singing'

I was grabbing coffee yesterday and overheard a driver telling another mechanic his 6.7 Powerstroke had a high-pitched hum before it lost power. He called it 'singing'. I'd always just called it injector noise, but that word made me listen closer to a Duramax I was working on today. Sure enough, there was a faint whistle in the rail I almost missed. Has anyone else picked up on a specific sound that tipped them off before a code even tripped?

3 comments

3 Comments

tara_palmer20d ago

Yeah, saw a forum post about that exact thing on a diesel page. They called it the "death whistle" before a high pressure fuel pump goes, lol. Makes you listen for all the little noises now.

fisher.mason20d ago

Death whistle" sounds a bit dramatic... is that a real thing or just forum talk? My old diesel makes weird noises all the time and it's still going.

james5331d ago

That "death whistle" thing is wild, lol. So is it a specific pitch or like a change in the normal injector tick? Trying to figure out what to actually listen for.