1987 300D Exhaust Blockage - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 05-01-2015, 07:22 AM Thread Starter
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Vehicle: 1987 300D
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1987 300D Exhaust Blockage

I just inherited a 1987 300D from my father. It has been sitting in his driveway and had not been started for about five years.

At first it would not start at all. I changed the fuel filters, bled the fuel system and put in fresh fuel. Still no luck. So I checked each injector. In order to reach the injectors I had to remove the air conduit that goes from the turbocharger to the intake manifold. With that part removed the engine started very easily. The I found that exhaust was coming from the turbo charger output (which explains why the engine would not start with the conduit in place) and no exhaust coming from the tailpipe.

The only conclusion I have reached is that there is a blockage in the exhaust system causing exhaust to be forced though the EGR plumbing.

I ran a plumbers "snake" up the tailpipe and did not find any debris (like from an animal nest) so now I think may be turbo is frozen and blocking the exhaust path.

My father did mention that the last time he drove it it seemed very sluggish - like maybe the turbo was failing.

So I'd like to ask the group:
1) How plausible is my theory of a frozen turbo?
2) How difficult is it to remove the turbo (I have a well equipped garage at home but the car is 1,000 miles away and outdoors)?

Thanks in advance for any insight.
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post #2 of 6 (permalink) Old 05-01-2015, 09:04 AM
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Tell us whether your exhaust has the piece like the one on the top or bottom

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post #3 of 6 (permalink) Old 05-01-2015, 12:34 PM Thread Starter
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The trap oxidizer was removed several years ago - when the car was still being driven regularly.
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post #4 of 6 (permalink) Old 05-01-2015, 02:30 PM
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Ok, so that means there's a catalyst down stream, which theoretically could be clogged. You can remove the intake duct from the air cleaner and determine whether the turbo shaft spins or has excessive sideplay. The sluggishness can be lots of things, but let's just focus on the exhaust stuff for now.
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post #5 of 6 (permalink) Old 05-02-2015, 05:23 PM
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this car has a exhaust particulate trap [ like a catalyst on a gas car ] this is where it plug up .i would remove it .
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post #6 of 6 (permalink) Old 05-02-2015, 05:24 PM
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the trap , may have been moved to the bottom of car , like a cat on a gas car , this is where the blockage is .remove and bypass .
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