Engine sounds like a diesel during cold morning starts

phillypoet313

Original poster
Member
Dec 23, 2012
5
I have a 2002 4.2 I6 LS Trailblazer that makes somewhat of a diesel sound (engine) in the morning, then quiets after a few miles. Can anyone suggest any type of oil or additive for this? I have no issues with the truck, just the annoying sound from the engine (during cold morning starts...only).
 

Wooluf1952

Member
Nov 20, 2011
2,663
Milwaukee, Wisconsin
Are you talking about noisy lifter clattering sound? Or a fan roar?
 

The_Roadie

Lifetime VIP Donor
Member
Nov 19, 2011
9,957
Portland, OR
Or a cracked exhaust manifold that seals up (for now) when it gets warm.
 

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