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September 28th, 2015, 13:08
#1
 Smokin!
In my '69 GP (400-4bbl) Making the trip back from the fall Pontiac car show at the museum in Pontiac, IL...noticed white smoke from the exhaust when I let up on the pedal on the hwy. Low on oil when I got home. Valve prob, right? Also started backfiring? Ideas??
Mark
Currently own a '69 Pontiac Grand Prix Model J
Once owned...1963 Grand Prix, 1967 Bonneville coupe, 1968 GTO Convertible, 1969 Grand Prix model J, 1972 Grand Prix Model J, 1977 Grand Prix LJ, 1979 Grand Prix
Check out www.classicpontiacmuscle.com!
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October 2nd, 2015, 00:19
#2
White smoke is usually coolant and blue is oil but it may have just looked white to you. Valve guides/seals could be your problem. The back firing could be fouled plugs. I would have a compression test and if that doesn't show anything a leak down test performed. If the engine has a lot of miles on it fixing the top end will usually lead to bottom end problems showing up after. Prepare for an overhaul.
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October 19th, 2015, 05:26
#3
Also could be a bad transmission vacuum modulator...
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