1985 300D white smoke LOTS!
 

This car start, and runs great. It has a perfect diesel sound to it. It just puffs out huge clouds of white unburned fuel. I checked the pump timing and it is dead on. I have not checked injectors, but I would think that if that was a problem I would be getting black smoke and probably some injector knocking. Could something be wrong internally with the IP? could the electronic rack be causing a problem? Valve adjustment and engine compression are good. Its not consuming water either, its white diesel smoke.

Is there some restriction in the intake?

Phil Forrest

I guess its possible, but I feel like the car has full power.

Air leak in to the fuel supply will also cause white smoke, sometimes loads of it. Could be as simple as a loose fitting or hose clamp. Id check everything, and id pull the supply line from the tank and draw vacuum on it with a mityvac and see if you are getting consistent fuel, or fuel with air bubbles

Are you sure it's unburned fuel? If it is, it should burn your eyes to the point you want to run away from it. It could be oil from a failed turbo seal.

No electronic rack in an 85, just a electronic rack sensor for the EGR.

Does it do it all the time? Do you have a video so we can see what it's doing?

check your chain stretch

dirty injectors => incomplete combustion => fuel in the exhaust. recommend you install rebuilt ones; get a hold of greazzer who has a sideline in this department....

I suspect it is turbo leaking oil. BTDT with a 81 300SD.

Logically I would imagine it might be oil getting past the exhaust side of the turbo seal. Especially if it is not immediately present on a cold start up. As the exhaust system heats up in that scenario it vaporizes the oil better.

Running performance would not be affected either I suspect. Many mosokito killers work on that basic principal to fog oil. Or planes injecting oil into the exhaust system to skywrite use basically the same principal..

As others mentioned does it burn your eyes bad or not? If not it is oil. Smells sweet is coolant of course but I think you would have mentioned that in your first post as it is so noticeable.

I swapped out injectors today and it did not make a difference. It is defiantly not smoking until it gets to full operating temperature. I know that it's not water vapor coming out the back. Not losing any coolant. I'm pretty sure it's fuel because it smells like diesel and it hurts my eyes, but I'm not 100% sure that it isn't oil. I tried having the smoke plow into a gallon zip lock bag so I could inspect the solid matter but the bag melted with the hot exhaust. I'll try something more solid tomorrow.

Reminds me of sending new sailors back aft to fetch a bucket of steam.

"Hey FNG, go down to the aft pipe shop and ask HT1 for an E6 punch."

Phil Forrest

Check the modulator if it is leaking ATF into the engine by way of the vacuum line. This will definitely burn white smoke.