Have an 85 12a streetport, just got it running, and it has some known history, but who knows how good that is. The car lets out a tiny bit of white smoke on start up, but really puts out the smoke after revving past 6k, then shifting. Will not do it at all if I don't get it high in the band. Shifting or not. I just recently put freeze plugs in the intake water pieces. It only makes a single big puff, and doesn't seem to smoke at all otherwise. I tried to search, but no one mentioned anything about a high RPM smoke puff.
I haven't driven it enough to check for coolant loss. What could be the problem?

 

You sure it's not oil smoke? Because mine does what you're talking about except the smoke is burning oil. It's because the oil control rings are going, in reality it's not so bad for the engine you just have to keep checking the oil if you are running it hard. Try driving it up to redline and then decelerating in first, if it's anything like mine you will see a very decent cloud behind you.
Grant

 

well, it could be oil, I will keep a keen eye on the level. Anyone else had this problem?

 

Sorry for the double-post. Delays on the server are killing me lately!

 

Yeah, I have this problem since I did the MMO in the oil. My SE has 176k miles, and it's definitely white/blue smoke (not coolant) and is only there on cold engine startup. Was going there for awhile when I could rev it up past 6k and get the 'smokescreen' effect.

Kinda ironic when you consider that my personalized plates read "SPYHUNT". Only thing I'm lacking is machineguns in the front end, and rockets for the anti-helicopter stuff (I've got the oil slick covered from my leaking oil cooler!).

Take it easy during startup to keep the oil pressure as low as possible and you won't burn as much. Also check your oil each fillup and you'll likely find out how much you're really burning. It'll surprise you.

 

Yeah, I went through about 1/2 Qt. for 3 autocross runs because of the high RPM. It was a really short course so I didn't take it out of first or put in the clutch at all, that could have something to do with it
Grant

 

i had a 89 fc that did the same ,i took it to a mazda specialst and he told me that it was bad o rings which where allowing a small amount of coolant through the combustion chamber.the result was coolant getting burned out through the exhaust..remember that a small leak is all it takes..o rings are a cheap repair.the only problemis that the engine has to come out and be opened.....

 

In reality, changing coolant o-rings isn't cheap. You basically have to rebuild the engine to do that. The o-rings themselves aren't too expensive, but its the rebuild kit needed to put the engine back together thats expensive.