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2001 Volvo V70 XC, this morning without warning, check engine light came on, engine began running very rough with a distinct rotten egg smell. First thought was catalytic converter issue. Took to Auto Zone for code reading but according to scanner, passed with no problems. Obviously there is a problem, any ideas?
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What was the code number? If the engine light didn't come on then it may have rectified itself and there really isn't a problem. Put the code reader on again and see if there is still a code in the memory.
its your alternator voltage regular failed and your alternator is isnt being limited to 12 vots and its overpowering your electric system. the smell of rotten eggs is your battery over heating and the acid inside is boiling giving off the sulfur based smell. this is unhealthy for you to breath and is a sure sign that your car needs to be repaired. you need to replace your alterantor and battery immeditly or it coud damage your vehicals computer. The new altenator will have a new regulator in it and you will be good.
I suggest replacing the O2 sensor(s). These detect the level of carbon monoxide in the exhaust, and at a certain level the exhaust is then returned to the engine to be reburned, then sent back through the exhaust, catalytic converter, then the muffler.
Take the code type to an auto parts dealer, and verify what the code is specifically referring to.
If the engine was idling (running) rough, also repalce the air filter, fuel filter, spark plugs<-- find out gap setting; plug wires, distributor cap and rotor (if equipped).
Also, if you haven't recently had the fluids changed, have them changed as well, as the filters for each and the gaskets if needed.
NOTE: if you smell an unusual smell coming from your car; the smell of rotten eggs or such, then your catalytic converter may need replaced.
Please let me know if you need further assistance.
What is a ETM? And why would it occur seemingly spontaneously?
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