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Re: 1991 mercedes e300 starts then smokes then shuts off
Sounds like too much restriction in the system if nothing else has changed but I would suggest a tune up with a minimum cap, rotor, coil and plugs. Also the OVP relay on the passenger side firewall is a known starting issue.
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look underneath at the exhaust pipe. after it comes off of the engine and starts back towards the rear of the car, you will see 2 muffler-looking parts close to the front. there will be o2 sensors on either side of these, which are called the catalytic convertors. Are you experiencing intermittent check engine lights? symptoms of a bad o2 sensor is the light will come on and off occasionally and poor fuel mileage. Sometimes you will get a clogged catalytic convertor which will make your o2 sensor foul up. you'll get a sulfur smell out of the exhaust when this happens.
Had a problem like this before and it was the computer..But you could faintly smell something like burnt wires..The computer should be down by the kick panel on the driverside..See if you smell anything on that side
there are two factory free recalls which will replace your catalitic convertor jeep replaced my convertor with 175k on my 1996 jeep also modify your park on tranmition and reprogram you computer all at no charge labor and parts!!!!!!!!!!!!!!!!!!!!!!!!!!