Question about 1996 Mercedes-Benz C-Class

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Mercedes c200 elegance 1996 model mis-firing on cylinders 1-4

I have replaced both coil packs, checked HT leads and plugs, traced all wiring from coil packs for damage,and I have had the car scanned. I have power to both terminals on both coils but no spark to 1-4 cylinders

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  • www_tonebase Jun 18, 2009

    hi jasperoni, the crank sensor was mentioned to me and i was told to clean it, and check that the points that it picks up the signals from are also clean, however i cant locate the sensor itself any ideas.

    regards tonebase.

  • Anonymous Apr 01, 2014

    I have put new plugs in and still no start,it was starting and driving,before

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  • 203 Answers

I beleive your firing order is 1 3 4 2. 1 and 4 are companion cylinders-meaning the piston is up or down at the same time i.e. compression and exhaust stroke both pistons are up and even on the exhaust stroke the ignition fires in order to burn unburnt fuel/ h ve you checked your trigger. There is a good coil testing tool that is placed over the coil and has a magnetic pickup that allows you to see if the coil is being triggered-just because you have power doesn't mean that you will have spark. I would replace your ignition wires and look at your wiring harness very carefully- if it is very brittle and you see bare wires exposed that is your most likley problem because the trigger is working for 1 and 3 and has the crank senser input for all for spark plugs and the cam senser is used for ignition advance and your fuel injection system. try wiggling your harness and see if your coils start to work. wireharnesses are a major problem on mercedes benz vehicles of that era. I hope I have been helpful

Posted on Jun 18, 2009

  • Ryan Jasper
    Ryan Jasper Jun 18, 2009

    It is located at the top of the bell housing. just behind the intake manifold. I would think that if it was defective that you would not have any spark at all. Usually you do not have to clean them unless you have a transmission or oil rear main leak. What happens is that the retaining bolt loosens up it is either a 10mm bolt or an e style bolt. check that bolt first. if you can rotate the sensor at all it is too loose. Follow the single wire that runs behind your intake down to the top of the bell housing-It is on your engine side of the bell housing towards the driver's side. good luck

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c17hydro_162.gif

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