My issue is different than the other interesting answers read on this Forum, and hence, the question:
I recently began to restore my Father's 1966 e-type. The white exhaust that I see only occurs after stopping at a red light or stop sign and then accelerating in first gear. It does not occur every time. The oil does not have a milky residue nor does the exhaust smell like oil. I have noticed some coolant drops on the floor, (which may have occurred because I overfilled the coolant reserve) but the exhaust does not smell "sweet" like coolant. Nor does it burn the eyes. Currently, I only drive the car short distances (under 30 miles). On a few occasions, there was no smoke at all.

This forum's experience is greatly appreciated.

 

Check the booster.
If the booster goes, it sucks brake fluid into the intake, and you get white smoke.

Hopefully you are NOT using DOT5 fluid, as the latest info is that Silicone Fluid, when it goes through a combustion process, turns to Silica, or Sand.

Remove the vacuum line, probe the inside with a q-tip, and temporarily blank it off and drive it without boost to see if the smoke is gone.

 

Curmudgeon:

Thanks for the quick response. We are using Castrol GTLMA fluid. The bottle states it is recommended for DOT3 and DOT4 specs.

My Son and I will check tomorrow.

Is the integral booster aligned with the slave cylinder assembly?

 

Curmudgeon:

Which vacuum line are you referring to? We removed the line to the intake manifold, q-tipped it and sealed it off. There was no improvement.

At your convenience, please shed some more of your expertise to help us out.

Regards,

 

Nice assist Curmudgeon
If you guys need any more help you could always try sending a pm to jag genius an or ken@britishparts on this forum

Good luck and sorry I cannot help more

 

Ok, thanks to both of you.........

 

Sorry.
Tied up with some non-Jag repairs.

No residue inside the hose?
And, manifold blanked off, no change?

The booster issue, at least on 3.4 and 3.8, is smoke is out of one pipe.
The port is on one leg or end.
Not sure how that works with three carbs into two pipes.

Seen a LOT of that, and it's the easiest to check out.

No milky white residue under the oil filler cap?

We're getting into good warm weather, so condensation is ruled out.

I know in cold weather my MK2 puts out a cloud, yet uses virtually no coolant (no overflow tank, so some expansion and loss happens).
Warm weather, no cloud.

No comes the interesting part.
How do you know it's white?

Not picking on you, but oil smoke can often look white in the rear-view mirrors.

Coming down off a hill, high manifold vacuum, two things.
One, brake booster which we have eliminated.

Two, valve guides and/or valve guide seals.

Ever run your finger around the inside of the tailpipes?

Tan?
Black?
Sooty?
Sticky?

And, how big a cloud?

Little puff is not a big deal.
4 or 5 cars disappear behind you, it's a problem.

 

Great questions, thanks again Curmudgeon.
Well taken, that most often when we see the 'white' smoke it is through the rear view mirror, however we have idled the car in our driveway and revved the engine after letting it sit, to recreate the scenario when at a stop light and the smoke in comparison to our white garage appears blackish in nature.

when i ran my fingers along the inside of the tailpipes it is definitely a black residue and it smells like typical exhaust.

The smoke cloud does not cause vehicles behind us to disappear.

I tend to think the smoke smells like gasoline. But my Son is not sure.

I'll let you know how we progress.

Best regards Senor, and we appreciate your interest and knowledge.