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Engine Un Balanced


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Hi guys i have just replaced my tail pipes for some new shiny ones, after driving about 50miles i have noticed that one side has been carbon coated and the other hasn't. Its a dry black dusty coating not wet or oily.

The car doesn't smoke at all and feel this could be a problem with one side running richer/leaner than the other. If i was to use a gas analyser does anyone know what sort of CO and HC readings i should expect from a 98 996 3.4. Also is it the Lamda/Oxygen sensor that regulates the fueling. If one of these was faulty should the Engine managment light be on. Is a 1998 996 OBD 2 if so where wouldi find the diagnostic port.. many thanks I will keep you posted.

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OBD II port is under the dash to the left of the steering wheel (LHD cars).

Yes, if there were a problem the CEL would come on and there would be fault codes. You might check when you turn the key on to see if the Check Engine Light comes on for a few seconds before you start the car - if it does not the bulb could be bad (or removed).

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How is your car running? If it's running good, maybe one side of the tailpipe was not finished properly/up to spec and when it heats up either something is going on with the finish, like burning or turning black or something like that. Did you notice this problem before?

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Hi and thanks for your replies.... The car runs very well smooth on idle and doesn't smell rich when running. Plenty of power. The engine light is working whislt the ignition is on. I do have some OBD software on my laptop. I was going compare the oxygen sensor data to see if they were similar. I was thinking of taking it to a garage to get the CO/HC checked has anyone got the spec for the emissions many thanks

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