Loud 6.7 Engine When Cold

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Jan 24, 2019 | 07:14 PM

leejk

Thread Starter

Mountain Pass

Joined: Sep 2008

Posts: 187

Likes: 0

Loud 6.7 Engine When Cold

Hi All,

My first winter with the truck. I’ve noticed that when temps are below freezing, the engine is noticeably louder than when the engine is warm. After a few minutes it sounds normal. Was wondering if something in upper engine is being oil starved. Truck hasn’t had first oil change yet. Has anyone experienced this?

thx

Jan 24, 2019 | 07:19 PM

jameslecount

Junior User

Joined: Dec 2018

Posts: 53

Likes: 0

Yes it’s a diesel lol mines the same way so is my Duramax so is every diesel I’ve ever owned

Jan 24, 2019 | 08:09 PM

maxum96

Tuned

Joined: Jan 2010

Posts: 419

Likes: 3

Normal. All diesel engines are louder when they're really cold. You should have heard my 2006 6.0 on a cold winter morning here in Colorado. It would wake the dead! lol

Jan 24, 2019 | 08:14 PM

BillyE

Fleet Mechanic

Joined: Feb 2018

Posts: 1,592

Likes: 204

Pilot injection is not used until engine temp gets to ~60 F in my experience.

Jan 24, 2019 | 09:24 PM

screwy

Cargo Master

Joined: Aug 2002

Posts: 2,117

Likes: 8

From: Over Yonder, MN

Quote:

Originally Posted by BillyE

Pilot injection is not used until engine temp gets to ~60 F in my experience.

This. Pilot injection is what makes modern diesels so quiet, but, for reasons unknown to me, it's not used when the engine is really cold. Ford actually put out a marketing video many years ago where they ran a 6.7 and switched pilot injection on and off so you could hear the difference, but I wasn't able to find it.

Edit, found it: