Question about 1997 Mercedes-Benz C-Class

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Engine runs very rough

I have just bought the car, the battery was completely dead, as in, drive for 20 miles, park up for 2 mins and battery wouldn't start the engine, it had been modified, as in the exhaust had the cat and all silencers removed and a sports rear box only, i have replaced these with the original parts and serviced the engine, but it has trouble ticking over for more than a couple of minutes and searches (revs between 1500 and 500) while it does, reving above 3500 - 4000 rpm causes it to repeatedly cut out then pick up and holding at any speed causes it to chug (sounds like its flooding as rev will clear it) and a strong smell of petrol and smokey emissions although the co2 and higher carbon readout are ok, on the dashboard where the mileage should be there is a symbol of a spanner/wrench with the number 1200 flashing until i start the engine then it dissapears after about 10 seconds after i start the engine, any help you could supply would be greatly appreciated, i do plan on getting the ECU read and any error codes explained but if you happen to know a cure then it would help me sooooo much....

thanks in advance...

Stuart

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You have a throttle position sensor on your vehicle that needs proper voltage to work. First thing, get a good battery in it(one that cranks every time). This will keep the sensor from losing its memory. Then, with a new battery in, it will either smooth out or you will need to reset the tps yourself. Easy enough, just turn the key to position 2 for approx 2 minutes. Assuming everthing works properly, the sensor will learn its endstops on its own. If you stll are having issues, then have the dealer check it when they scan for codes. Also, the wrench flashing at you is the maintenance indicator, so you might want to have that done as well. Never hurts when you've just bought a vehicle.

Posted on Nov 14, 2008

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