Engine smokes after it idles awhile

[blsstang]

Any ideas on why my 200 CI Mustang smokes after it idles awhile? It seems to be okay when it first starts but then as I drive it and sit at a stop light and then go, it will blow some blue smoke. Once I am driving again, it seems to get better. Thoughts?

 

[blsstang]

Forgot to mention that the engine runs great otherwise. Starts right up and idles smoothly. Has a newer Holley 490? one barrel carb with an auto choke.

 

[tony1963]

What you are describing sounds like worn valve guides, leaking valve seals, worn rings, worn bore, poorly performing PCV valve or a combination of all three.

 

[Junk-Falcon]

thats probly valve seals ,, guides might be warn too but these seals fallapart after 20 years

 

[jamyers]

Valve seals and maybe guides as well.

Had the exact same thing on Mustang 289, if it idled for more than 2-3 minutes, when you took off it blew a HUGE cloud of oil smoke.

 

[blsstang]

Thanks for the feedback. I'll let you know what I find out.