'97 230 SLK loss of power - Mercedes Benz SLK Forum

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#1 Old 03-16-2012
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'97 230 SLK loss of power

Hi guys,

Just joined as my mother has an SLK that I look after for her.

Got to do a service on it but took it out for a drive the other day to check it out and found that it was seriously short of power. Much slower than it was last time I drove it.

There are no warning/engine check lights on the dash, and it starts and drives fine until you want to go fast when there's nothing there.

It feels strangled. Like there's no boost or something, particularly at higher revs. I did notice once when the gearbox kicked down that there was a brief misfire, but usually it runs smoothly on four.

Is this a problem that other SLK owners have suffered or is there a common problem that causes this?

Thanks in advance!
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#2 Old 03-16-2012
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Welcome to the World’s Premier Mercedes-Benz SLK Community from Valrico, Florida!


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#3 Old 03-16-2012
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how much mileage? time for new sparks?

have you an owner's and maintenance manual?


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#4 Old 03-16-2012
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Welcome from New Hampshire, its hard to find a starting point with out any codes. If it falls flat on its face when you hit the gas i would start with the super charger.
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#5 Old 03-17-2012
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Hi, the car has quite low miles (can't remember exactly) as it's a Japanese import.

I replaced the supercharger belt within the last 12 months. While the blower is obviously working fine I suppose there could be a hole in a boost pipe.
I'll replace the plugs as a matter of course at the service.

The only other thing is that one of the catalytic convertors has started rattling. I know these can block, which would strange the engine. Has anyone else had experience of this?

I know it's a pretty vague request but I don't usually work on cars this modern so I wondered whether this is something someone else has experienced in the past and got to the bottom of.

My thoughts so far (in no particular order)
- Cat melted blocking exhaust
- Sensor (MAF, cam, etc.) sensor down causing ECU to restrict itself
- Boost leak
- did I read somewhere about a cam magnet or something?
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#6 Old 03-17-2012
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Cleaning the Maf is a cheap and easy job, most auto parts store's carry maf airflow cleaner.
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