Loss of power - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 11-01-2013, 02:15 PM Thread Starter
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Date registered: Nov 2013
Vehicle: Mercedes 210 97-mod Benzin
Location: Oslo
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Loss of power

Could dust in the vakuumsystem adjusting the height of the headlamps cause loss of power on my 97-mod 210?
Are there any vakuum-filter to be cleaned?
I think some dust disappeared into the system today when I repaired the vakuum nippel on one of the headlamps.
After this repair I experienced loss of power- max3500rpm- and I could hardly make the last steep hill on my way home.
The power occasionally came back for some seconds, then died away again. Sounds sometimes like running on 3 cylinders.
Any ideas?
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post #2 of 4 (permalink) Old 11-03-2013, 05:20 AM Thread Starter
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I am not absolutely certain that it is caused by dirt in the vacuum system. However, the symptoms came after I had connected the vacuum hoses to the headlamps, which previous*owner had left lying loose without being connected to the lamps. Below the left headlamp is also another blue not connected vacuum hose that I do not find out where to connect.Any tips?*
Tested car today and found that:
- A cold engine runs normally with the exception that it does not exceed 3800 rpm*
- After driving for10 min I start to lose engine power so it can hardly manage going up steep hills.*
- When I pump the throttle pedal*ie release / press repeatedly I manage to keep most of the engine power*
- Keeping throttle pedal in steady position following happens: It dies slowly away until it suddenly catches power again before it dies out slowly again - and this happens repeatedly as long as I keep the accelerator in a steady position.

Having previously had similar problem starting half warm engine but then it lasted only for about 20 seconds before it worked normally again.

(Gasolin car 97mod 2,3)
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post #3 of 4 (permalink) Old 11-07-2013, 10:58 AM Thread Starter
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The car is a 97 mod 230 T, benzin., WDB2102371A528670

I solved some of the problems when I disconnected the battery to reset the ECU.
I think the reason for these problems was not dirt in the vacuum-system but the ECU going crazy when I mounted the two vacuumhoses to the headslamps previous being loose. Does it make sense??

The symptoms that still make trouble and have been there since I bought the car:
1. Max rpm(the gear in P) is approx 3800 –pressing the accelerator further makes the rpm going up and down.
2. Starting half-warm engine it will go normally for approx. 30 sec then rpm starts to go up and down, the engine looses power, like some cylinders stop working, and engine almost almost stops. This will last for 15-40 sec for then to be normal again.
No problem when starting cold engine.
3. The engine is more slow in acceleration than you could expect from such a car.

Suspecting vacuum problems I have been looking for loose cables or leakage in vacuum but I`m not so experienced in this field.
I found a loose, open vacuum hose under left headlamp ending in the firewall on the passenger side, see picture:

Also found a loose grounding cable near the intake that I don`t see where to fasten, se pictures

Thanks for help!
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post #4 of 4 (permalink) Old 11-11-2013, 11:53 AM
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Not sure about the vacuum problem cuz I am pretty new to mb, but the cable near the intake could be 2 things an old cd player/ radio ground or an engine ground, the engine ground as far as I know usually run off the alternator. Wish I could help out more let me know what you come up with
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