Join Date: Feb 2014
Location: Bristol, UK
Vehicle: Mercedes SLK 200 (2001)
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SLK200 (2001) Power Loss Problem
Your help is desperately needed!
Mercedes SLK 200 (Manual transmission)
2001 (R170 Engine)
-Car has reduced power (approximately 60% of normal power). It is possibly in limp mode, or is not supercharging (however you can still hear the supercharger clutch engaging when necessary revs are reached).
-It has no ‘consistent’ warning lights lit on the dash. Most of the time the engine warning light is lit, however it can run with reduced power with no warning lights lit. Generally after the code is cleared, it will run with reduced power for a few days before the engine light comes on again (can the car go into limp mode without any warning lights?).
-Garage said the code was a Mass Air Flow error and the MAF sensor needed replacing. Unfortunately I don't have the actual codes, but I can go back to the garage to get them if required.
-The first time the problem occurred, I removed and cleaned the MAF sensor and the car ran fine for about a month. The second time it happened, the garage installed a brand new MAF sensor and cleared the warning code. The same problem occurred within a few days.
-Sometimes it will start-up and drive fine with normal power. Most of the time it starts-up with reduced power. It never changes whilst the engine is running – it either starts up with full power or reduced power, and remains at that level until it is switched off.
-Returned it to the garage, who this time said that the “supercharger throttle plate” was dirty and sticking, and had therefore been cleaned. They also cleared the warning code again. A couple of days later the problem occurred again.
-It idles fine, with no shuddering regardless of power output.
The garage clearly don’t know what the issue is, however as I paid them to initially fix the car I need to return it to them to have it fixed under warranty rather than pay a different garage. I’ve trawled the internet and this forum, and while a lot of people seem to have problems with the MAF sensor, I can’t seem to find anyone with an identical problem. I am actually thinking the MAF sensor has not got anything to do with it. Any ideas would be appreciated.
Last edited by Nicksnake1; 02-21-2014 at 09:16 AM.
Reason: Added Manual Transmission