89 Chevy Silverado 350 engine c1500

Checked compression on 350 engine,126 each cylinder and spark plugs are dry no oil. But still smokes only when I start the engine.

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My 89 Chevy Silverado C 1500 compression cylinders126 each ,spark plugs dry no oil why does it smoke only when I start my vehicle?


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Joe Ram, You did not say but will assume you mean a little blue type smoke(oil burning) at initial start. Possible worn/missing valve seals, worn valve guides letting oil run down into cylinder after it has sat a while. If compression is close to 126 in all cylinders, this is runable but maybe showing signs of wear. The only thing a compression test will tell you is the difference between the cylinders. With all plugs out, add approx. a teaspoon of oil to one cylinder at a time before checking compression and see if compression comes up considerably, if it does then yes rings/cylinders are showing signs of wear. If compression does not increase quite considerably, this indicates a problem with the cylinders valves or head gasket usually. What you may want to do is a cylinder leak down test to tell you exactly what is wrong with engine, not only will it tell you what is wrong, it will tell you how bad it is. Below links may help explain correct ways and trouble shooting while doing a compression/leak down test. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.




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