Question about 1992 GMC Sierra K1500

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1992 gmc sierra turbo diesel starts and idles fine until warm up

My 6.5 L Turbo Diesel has been working very well until a week ago. The truck still starts right up and idles well, but as soon as the engine warms to the point that it would idle down a bit, it begins to run rough and puffs of smoke begin coming out of the exhaust. The smoke is blue, so definitely oil, but there is no smoke at all during the period that it idles fine, which is on a cold start for several minutes only. If I attempt to use the truck it lacks in power and more blue smoke from the exhaust. It will continue to run if I just let it sit, but the smoke will persist until I let it cool and it will start fine all over again. My fuel is fine, my lift pump is pumping away, and my filter is clean as new. Why is it running so rough and where can I look to diagnose this problem.

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  • GMC Master
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It's time for a Italian tune up!

The blue smoke can be one of two thing.

oil drop from the valve stem (from engine head to cyclinders)
or
diesel soot collect inside the exhaust system.

===
I will take a 5-10 minutes high rpm (not redline) ran on the highway.
Pay close attention to the rear view mirror and look for black diesel soot.
=== I will use Diesel Cleen or similar product to condition the fuel. (keep moisture down)
Use the recommended amount of SEAFOAM oil additive to condition the valve stem seal/rubber parts.

I can not rule out excessive blown by.
Can you get a diesel compression tester?
When was the last valve adjustment?

Please post the actual odometer on the engine and I will follow up on it.

Posted on Aug 24, 2009

  • murphster Jan 13, 2011

    i have the same issue only it never occured until i ran out of fuel cause appearently my gauge is stuck i need some help

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Posted on Jan 02, 2017

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