Same as my 190D. I have 5 BRAND NEW Bosch glow plugs. It is *better* if I let it glow for 30 seconds, but I shouldn't have to wait so long on a 40 degree morning. I didn't always have to glow it so long. I'm suspecting that my injectors need to be rebuilt. I'll be doing that soon and I will post my results.

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1987 W201 190D

I'm not.

The injectors won't magically stop dripping after 30 seconds of run time.

If the glow plugs are reasonably new and they are not doing the job.........lower than desirable compression is suspected.

He might be in the same situation with the two low cylinders.

My thought is that a poor spray pattern with larger than desired droplets causes poor combustion. A cold combustion chamber exacerbates the poor combustion. Once the prechamber, head, and piston are hot, the temperature assists in vaporizing the larger fuel droplets and things smooth out considerably.

I've got somewhere between 160k and 200k miles on these injectors. They've never been rebuilt.

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1987 W201 190D

While I cannot disagree with the logic, I'm of the opinion that you'd need four or five bad injectors to create such a situation, and, if such a condition was present, it would manifest itself in other ways when the engine was hot. Fuel economy would be off by a good bit.........power would certainly be down. You cannot have four or five injectors with bad patterns and have only some smoke on cold start.

I think that only one or two injectors would give this symptom. I've been around engines long enough to hear when they are misfiring on one, two, or more cylinders. Mine starts on four. Runs badly on one. The one causes plenty of smoke. I think if I had four or five injectors that bad, the car would be extremely difficult to start, 30 seconds on the glow plugs or not.

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1987 W201 190D

Are you sure it's smoke, or is there some steam element (dissipates quickly instead of floating away as smoke)?

The long glow helps all but the most needy usually, do you have any fuel leaks at the injectors or delivery valves?

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Gone to the dark side

- Jeff

On mine it is definitely fuel. No coolant or oil consumption whatsoever. The long glow definitely helps, but there is no reason I should need a 30 second glow cycle on a 40 degree day.

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1987 W201 190D

Just thought id throw in my input i have a 87 300d...All new nozzles, all new glowplugs confirmed working correctly, done the long glow still morning start bucks and puffs out bluish unburnt diesel smelling smoke for about 1 min every first start weather doesnt change it i live in las vegas NV so even warm late mornings.....i have decided to deal with it later...the car has close to 400,000 miles "estimated" odometer hasnt worked in almost ten years..so im assuming timing issues from chain or pump....could be compression but the car has plenty of power and silky smooth idle after a few minutes...ill be curious to see what is causing yours

Arlo

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W211 E550
HVAC/R Certified Technician

I had the same problem as in that video. I found a bad glow plug and replaced it but the problem actually got worse. I tested them again over the weekend and found that suddenly, two more of the glow plugs where bad. I replaced them I have almost perfect starts now. However I still get a small amount of the misfireing/blue smoke that originally started this thread.

#6 injector is definatly leaking around the edges. I'm going to start by fixing that but if it doesn't work the "Hole in the line" theory might me my next step.

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."

My 85 300TD has a similar "problem". It's not really a problem, however
on the first start of the day, I have to push on the accelerator ever so
slightly to make my start up as smooth as my wife's 83SD. She can start
hers without touching the pedal and it's as smooth as silk right off. Mine as well IF and ONLY if
I push the pedal slightly on start. Warm idle is set to 750rpm. After 1 second it's just fine. It just
bugs me a little as her car has 280,000 and mine only 109,000. I replaced
my nozzles, did a valve adjustment. I LOVE the way it runs. It seems
MUCH peppier than the SD. Where she has to downshift up "the big hill" where we live, mine just blasts up it. She seems to get better milage than
me though. I NEVER get more than 21 mpg combined, with most being in town 90/10. She gets about 23/24 in roughly the same conditions. She has pulled 28mpg on trips to her mother's consistantly, I got 23 on a short trip to SF, the best mpg I've had. Does this sound normal?

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson

sounds normal to me. i get anywhere from 22 to 28 with my 300sd

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1981 300SD, 270K, two tank wvo system
1985 300D, 288K, california version
1985 300DT wagon, 315k, broken odo

I have a 1994 Ford F250 with a 7.3 liter turbo (pre-Powerstroke) that caused me much grief with rough and smokey cold starts. Like some of the posts here, the smoke would clear after 30 seconds to a minute of running, depending on the outside temp. To make a long story short, I ended up replacing the injection pump and all problems went away. I offer this only as an additional point to consider, not as a solution to the OP problem. I make no claim to having any experience with my Mercedes injection pumps, except to believe that they are far more durable than the rotary style pump in my Ford. Regardless, injectors will not function properly with inadequate fuel pressure. There are other symptoms that occur with a sub-standard IP like reduced fuel mileage and poor performance, but I also think that these symptoms can come on so gradually that some drivers may not notice the deterioration. If this is a non-issue with Mercedes then please post accordingly and I'll remove my post.

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-RK
'83 240D, auto, 170,000 miles "Old Blue"
'87 300TD, 140,000 miles