Thinking of getting a 300Sd the owner states there s lots of black smoke out of the tail pipe when accelerating. The car has been sitting for 2 years. Thanks

__________________
72 280SE His Majesty

I would think it's unburned fuel except that it has been sitting for so long. Maybe it just needs a good Italian tuneup or some diesel purge.

__________________
1985 MB 300D/T

Fell off the WVO bandwagon when people started trying to charge $2.50 a gallon for dirty vegetable oil.

Unburnt fuel. Clogged air filter, valve adjustment past due, bad injector(s), stuck turbo, low compression, etc. Anything that will cause the engine to be starved of enough air to complete combustion.

He also stated the car lacks power. Black smoke plus no power= bad turbo maybe??

__________________
72 280SE His Majesty

It could be a bad turbo. It could also be a very plugged up air filter. Valves out of adjustment could do that also, but I think would probably cause hard starting if they were really tight. Really loose might smoke a lot but with easy starts, however these engines tend to get tight on the valve clearance when they aren't adjusted regularly. Late timing might cause similar symptoms.

__________________
Whoever said there's nothing more expensive than a cheap Mercedes never had a cheap Jaguar.

83 300D Turbo with manual conversion, early W126 vented front rotors and H4 headlights 400,xxx miles
08 Suzuki GSX-R600 M4 Slip-on 22,xxx miles
88 Jaguar XJS V12 94,xxx miles. Work in progress.

It means that nobody will follow you!

__________________
Current:
1985 300D aka Miss Margaret
1991 300SE aka Alarice
1995 SL320 aka Samantha
1997 K1500 Silverado
Past:
1999 E300 ex-wife got it and let her son ruin it
1984 190 2.3 ex-wife got it and let her son destroy a great car
1985 300D (CA version) aka Maybelline lost to deer at high speed.
1981 300D aka Madeline (went to salvage at near 400k) rusty, yet best car I ever drove
Wishlist:
McFarlan TV6 (only a few privately owned)
ReVere with Rochester engine
1917 Premier (only one left)

no mosquitos in your neighborhood either.

__________________


1980 500SE/AMG Euro
1981 500SEL Euro
1982 380SEL
1983 300TD
1983 500SEC/AMG Euro
1984 500SEC
1984 300TD Euro
1986 190E 2.3-16
1986 190E 2.3
1987 300D
1997 C36 AMG
2003 C320T 4matic

past: 1969 280SE 4.5 | 1978 240D | 1978 300D | 1981 300SD | 1981 300SD | 1982 300CD | 1983 300CD | 1983 300SD | 1983 380SEC | 1984 300D | 1984 300D | 1984 300TD | 1984 500SEL | 1984 300SD | 1985 300D | 1986 300E | 1986 560SEL | 1986 560SEL/Carat | 1987 560SEC | 1991 300D 2.5 | 2006 R350

It means an overly rich fuel condition! This could be a lot of things and good posts above explain some of these. This needs further investigation. How many miles on this vehicle?

It should be fixed asap. Black smoke results in very high exhaust temperatures which can easily damage the engine.

I assume the car is in N. VA as well. Mild winters warm summers. Check fuel lines for microbe build-up.
Everything else recommended Forced should be looked into.

Zill.

It could be something as simple as a broken ALDA line or some other boost leak.

__________________
green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png

The car has around 300K on i. I will check it out and report.

__________________
72 280SE His Majesty

Broken ALDA line would result in less smoke because they would be no extra fuel with the boost.

look at the alda and see if the cap is disturbed, it could be as simple as a kid was playing with it, and cranked it all the way over.
my bet is on the air filter though.

__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 190D 2.5Turbo
1987 190D 2.5-5SPEED!!!

1987 300TD
1987 300TD
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!

Forced,

Wrong again. Its lean mixtures that cause high exhaust gas temperatures (EGT).

Gasoline piston engine airplanes have carburators that have manually adjustable fuel mixtures. The mixture is leaned out for maximum power an economy. BUT the pilot watches the EGT gage so as not to not make the mixture too lean that will make the EGT too high and damage the engine.

Small 2-cycle engines (chain saws, weed whackers etc) can be tuned for maximum engine speed by leaning the mixture but if its too lean, the engine will run too hot and may sieze (don't ask me how I know this). The proper way to adjust the fuel mixture on these engines is to use a tachometer and only adjust the fuel mixture for the maximum engine speed specified by the manufacturer.


I know it seems logical that the more fuel, the higher the EGT. But that's not the way it works on the real world.

P E H