Question about 1993 Mercedes-Benz 190

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Car jerks intermittently, sometimes slightly, other times one or two harder jerks.

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Does it seem to misfire or backfire?It sounds alot like a trnsmission or clutch starting to go bad,depending on which you have obviously.It definitely sounds like an automatic transmission I would say.If it is transmission,I have never seen good results from rebuilt or used ones.It is best to replace.Call a few shops,they will give a free opinion and estimate usually as it is good for business.Good luck! Greg

Posted on Aug 26, 2010

  • Greg McCarthy Aug 26, 2010

    I just thought of something.If you intend to keep the car,there is 1 thing you should consider.If you live in a place where you use the a/c alot,it may be very expensive to get an a/c freon fill if you need it.Pre-1995 cars use R-12 freon and shops need to have a special license to buy,sell,use,and dispose of it.If you haven't already,you may even have to consider replacing the whole a/c system to use the current R-134a freon that is used because the 2 systems are completely incompatible with each other.Hope I got to you in time.I'm pretty sure I did as a transmission does not happen in a couple hours,but if I didn't,I'm sorry.Just for the heck of it,you could ask a couple shops about possible refill/replace costs just to see what you're facing.If you live in Alaska or North Canada,no problem eh?Good luck! Greg

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Start with the plugs. The ancillary stuff is pretty robust and any misfire is likely to be old plugs. If the plugs are OK then perhaps the injectors could do with a back flush. Be careful pulling the engine wiring loom around too much, the insulation become brittle over time due to the effect of heat so be gentle. The car is fitted with a diagnostics port but it is most likely a blink code output. If you are able to it would be good to get a report from the saved errors stored on the ECU

Posted on Aug 26, 2010

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