6.2 liter questions

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Aug 18, 2013 | 03:06 PM

Detroit diesel fan

Thread Starter

Newbie

Joined: Aug 2013

Posts: 6

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6.2 liter questions

I just bought a 1986 K20 6.2 liter N/A 4 Speed with granny low 4x4. It smokes when idling, mostly on drivers side clears up then comes back. While driving on the road it clears up. Good power at all times. Any ideas?

Aug 18, 2013 | 04:52 PM

Mayhem

Diesel Wrench

Joined: Jun 2012

Posts: 1,258

Likes: 128

From: Middle of nowhere Tn

Injectors

Aug 22, 2013 | 12:29 AM

cviola2005

Diesel Enthusiast

Joined: Apr 2012

Posts: 312

Likes: 18

From: Clarkrange, TN

What color smoke? My first thought is valve stem seals.

Sep 15, 2013 | 10:41 PM

fommy100

Diesel Fan

Joined: Feb 2011

Posts: 36

Likes: 1

From: San Antonio TX

Run power services, through it at the next fill up. will clean out gum and tarnish from the fuel lines and injection pump. If this dose not help then its new injectors time

Sep 17, 2013 | 08:16 PM

racer55

Diesel Bomber

Joined: Oct 2012

Posts: 1,848

Likes: 103

From: Scugog Island ONT.

Color of the smoke is important to know.

Blue-oil or way too much fuel from a bad injector?
Grey-incomplete combustion from low compression or many weak injectors?
White-coolant?