I am getting blue smoke out the tail pipe- only in the morning after I start the car. It then goes away. At first I thought maybe an issue with a ring or valve seats, etc, but now it appears that maybe trans fluid might be getting into a cylinder? Can a bad vacuum modulator cause this? What else? THANKS>
Chevrolet Q&AAsk Your Question
1996 Chevrolet Lumina Question: Blowing Blue SMoke
Answer #1Victor Mufflers October 10, 2011, 12:25Enthusiast
The problem could be a problem with piston rings; however, it is virtually impossible for transmission fluid to get into the combustion chamber, and just as unlikely that a vaccuum modulator could cause this issue. It is most likely a failed gasket or worn seal as blue smoke is caused by the presense of oil in the combustion chamber during the ignition cycle.
ReplyQuicksword, October 10, 2011, 14:41Rookie
Thank you for your input. I have read the following online about trans fluid getting into the combustion chamber:
When the vacuum modulator diaphram ruptures the fluid is sucked out of the transmission and burnt in the engine. Here is another one:
if you know anything about cars, take a look at possible vacuum lines attached to the transmission. on cheap old american cars there was a vacuum activated transmission gear kick-down, and often the membrane in the vacuum link would rupture causing transmission fluid to be sucked through the vacuum line and into the combustion chamber and hence out the exhaust. So now I am confused?