300 diesel power loss and smoke. Help! - Mercedes-Benz Forum
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#1 (permalink) Old 11-04-2012, 05:59 PM
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300 diesel power loss and smoke. Help!

I've recently replaced injectors and the car was running well for a few thousand miles.
I do still have a leaky pre-chamber that I can't resolve, so I'm living with a bit of leaking (it smells!).
Starting recently, when I'm cruising or decelerating slightly, the car loses a bit of power...I can feel it "drag" a bit, and this is accompanied by a cloud of smoke from the tailpipe.
Any ideas?
Thanks in advance!
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#2 (permalink) Old 11-07-2012, 03:48 PM
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Also...stepping on the accelerator clears it up...if it were a gas engine, it would be something like a spark plug going south...loading up the cylinder then clearing out unburnt fuel...but it's not gas, of course.
Anybody?
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#3 (permalink) Old 11-07-2012, 04:16 PM
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What color is the smoke?
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#4 (permalink) Old 11-07-2012, 04:16 PM
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It sounds like you're losing boost pressure. Check your vacuum plumbing and routing.
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#5 (permalink) Old 11-07-2012, 06:30 PM
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Originally Posted by 1992 300D View Post
What color is the smoke?
Kinda hard to say looking at it in the rearview at speed...but it isn't black...probably not blue...probably white.
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#6 (permalink) Old 11-07-2012, 06:31 PM
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Originally Posted by Zeitgeist View Post
It sounds like you're losing boost pressure. Check your vacuum plumbing and routing.
Thanks...I will.
I've lost power like this before, but I didn't know it could cause smoke, too.
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#7 (permalink) Old 11-07-2012, 07:13 PM
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Yeah well I hope it's blue and not white because white is usually bad.
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#8 (permalink) Old 11-07-2012, 07:19 PM
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This is why I was just suggesting that you swap in a pressure activated wastegate ^
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#9 (permalink) Old 11-08-2012, 04:51 AM
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This is why I was just suggesting that you swap in a pressure activated wastegate ^
Sorry...I don't understand.
I didn't see a suggestion of swapping in a pressure activated wastegate.
Did you confuse my thread with another?
I'm assuming mine is vacuum activated.
I'm not familiar with a pressure activated one.
Could you explain?
Thanks!

Edit>>>
I found it...your post was directed to 92 300.
I found that thread.
I'll have to check it out and see if it's out of my league, ability-wise.

Last edited by charliechitlins; 11-08-2012 at 05:05 AM.
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#10 (permalink) Old 11-08-2012, 07:53 AM
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You might just find that it's a simple cracked vacuum line or junction, so I'd continue down that diagnostic pathway for now. I made that reference to the other gentleman 'cause he already has the car torn apart for an unrelated issue, and now is the perfect time for some preemptive maintenance.
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