Having problems with your 1993 GMC Sierra ?

Why does my 1993 gmc smoke blue when i start it but clears up a little when it warms up

\015 Why does my 1993 gmc sierra put out slightly blue smoke when i first start it and kinda clear up when it warms up?\015 Posted / edited by AnonymousUser on : 15-10-2018

Answers :

There is wear in the engine which allows it to burn a little oil. When cold, the clearances are looser, and a bit more oil gets through. It will be either the piston rings, or valve guides and seals, which need attention.

A compression test, which you can do yourself, will probably show a loss in compression in one or more cylinders. Do that to get a baseline, then squirt a teaspoon of oil into the spark plug hole and repeat the test. If the test result improves, the rings are worn. If not, the valve guides and seals need work.

http://autos.yahoo.com/maintain/repairqa/engine/ques056_1.html
Repair Help & Product Troubleshooting for 1993 GMC Sierra

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