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Old 06-11-2012, 06:19 PM
Join Date: Dec 2006
Location: Orillia, Ontario
Posts: 53
300CDT Lots of Black Smoke

I have a 1985 300CDT. Odo wasn't working when I acquired it but it probably has 250,000 km.

I was having issues with it last winter before it went in to storage, it seemed to be a fuel starvation/air issue after it sat for a few hours. It would start, run for about 1 km then die. I would eventually be able to get it going again and it would run fine after that.

I parked the car for the Canadian winter and rebuilt the injectors with monark nozzles, changed all the filters, in tank screen and new glow plugs as well. It was running well but now it is blowing incredible amounts of black smoke, mostly on harder acceleration and at idle. It stinks big time. It has always smoked a little since I got the car but it is so much worse than before. Also the trans doesn't seem to downshift properly. If I don't manual downshift or come to a complete stop it doesn't downshift and accelerates like a snail.

I have the car on WVO/Diesel, this is by no means my first MB or WVO kit though. But interestingly, I have a fuel pressure/vacuum gauge to monitor the pressure of whichever fuel I am on. I measure the pressure before the lift pump and I have electric fuel pumps separately at the VO and diesel tank. I have good vacuum in the lines and no apparent leaks when under pressure....everything seems ok.

Any ideas on where to start?

My best guess is:

1. I botched the injector rebuild
2. The engine is worn out
3. My trans or vacuum system is not shifting properly

Should I try new injectors or is there a bigger problem?
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Old 06-14-2012, 05:35 AM
A work in process...
Join Date: Oct 2009
Location: Texas
Posts: 985
Lots of smoke would indicate to me that you are not fully burning your fuel.

I'm not clear on if you did these maintenance items before or after storage. Anyway, if you are blowing out all this smoke, you are probably getting plenty of fuel but not enough air. Double check your intake system for issues. Make sure your turbo is spooling up.
1981 240D ChinaBlue (Got her running with a donor engine.)
1983 300DTurbo w/sunroof.
1984 300TD manual sunroof. (Electrical Gremlins)
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Old 06-14-2012, 07:00 AM
Registered User
Join Date: Mar 2010
Location: Orillia, Ontario
Posts: 201
Have you reset the pump timing since the injector change?

I'm in Haliburton if you want a hand
Currently rebuilding engine on 300GD
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Old 06-14-2012, 09:26 AM
Registered User
Join Date: Jan 2002
Posts: 18,355
Critters built a nest in the air filter over the winter.
1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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