White smoke from exaust - Team Camaro Tech
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post #1 of 3 (permalink) Old Jun 11th, 03, 10:39 AM Thread Starter
Tech Team
Join Date: Oct 2000
Location: Stockton, Ca
Posts: 74

Hello, the topic of "white smoke" coming from the exaust has been touched on before, I am hoping for a refresher course. I have a 68 camaro, 350, very mild for the most part. I have a decent cam, intake and a good Edelbrock carb. I drive the car everyday in CA. Temp. out here right now is about low 90's. The car usually runs between 160-170 degrees. Lately I have noticed a small abount of white smoke coming from my exaust. Only periodically will it come. I have a clean air cleaner, new fuel filter, clean carb, and I don't leak any radiator fluid. The car does not run any hotter, I also haven't lost any power either. But... I'd still like to get a handle on this thing now, in case it becomes a bigger problem. What should I be checking to see whats going on? Please cut it down to as basic as possible, I'm still learning all the termonology of car maintence. Thanks.
bigtedards is offline  
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post #2 of 3 (permalink) Old Jun 11th, 03, 11:07 AM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

White smoke can be water vapor from a coolant leak. To verify, check the plugs. The cylinders that burn water will be scoured white. Whitish-blue smoke is oil. Could be from rings not sealing either on an old worn out engine or a fresh one that isn't broke in yet. Valve guides can leak oil past the intake valve. You'll notice this problem upon deaccelleration or initial startup. This problem can be compounded by plugged up drain-back holes in the head which will allow oil to pool above the valve guide. Other sources of white smoke are tranny fluid being sucked up through a perferated vacuum modulator or a bad PCV system.


68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 3 (permalink) Old Jun 12th, 03, 07:52 AM
Senior Tech
Join Date: Nov 2002
Location: Aiea, Hawaii
Posts: 571

Nothing left but make sure you have fresh oil and filter. If the oil is blackish change it. Crude is black. Car oil is clear [img]smile.gif[/img]
In days of old after hard runs of 120 plus I'd end up stopping at a light and see smoke coming out. Never could figure if it was oil or cooked muffler crud. Only showed up after extended rpms. Was and always will be a firm believer in fresh 10w40.
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