acceleration just fell flat - Mercedes Benz SLK Forum

SLK R170 General Discussion SLK 200, SLK 230K, SLK 320, SLK32 AMG

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#1 Old 03-12-2017
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acceleration just fell flat

I was driving my 2000 slk230 today and about 50' from pulling away from a stop sign, the acceleration just fell flat. The engine remained smooth but very slow acceleration even at full throttle. Engine idles fine and smooth as well. No CEL or code. I disconnected the plug on the TPS and cleaned it with electric contact cleaner, still no joy. Before I order a TPS, is there away to test these? Mine is under the hood, not at the pedal.

Thanks for any suggestions!

Jon D.
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#2 Old 03-12-2017
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Bump to the top! New thread made
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#3 Old 03-13-2017
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#4 Old 03-14-2017
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Update: issue solved

I figured before I write a check for a new TPS I would check some things. I was bothered that I didn't get a code. I checked my dash light and confirmed the CEL bulb was good. I figured I would unplug the MAF just to make sure I could get a code of some kind. Sure enough, the CEL came on. The interesting thing was when I plugged the MAF back in, the engine accelerated more strongly though not as smoothly as before. It would backfire and stumble but definitely revved quicker. I pulled the MAF apart but it looked pretty clean since I clean it every year. I grabbed my can of MAF cleaner and sprayed it down. I put it back together after it dried and everything is back to normal.

I've experienced rough running from a dirty MAF in the past and gotten misfire codes etc, but this time there was no code and the car felt like it had gone into limp mode. I just thought I would post this outcome if someone else has the same experience. I also failed to mention this is a manual transmission.
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#5 Old 03-14-2017
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Just learning here....what's a MAF?
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#6 Old 03-14-2017
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Just learning here....what's a MAF?
Mass (air) flow sensor... let me Google that for you <here> (in case you'd like to know more).
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