what causes a sudden onset of black sooty exhaust and rough, wavering idle.?
Overly rich air/fuel mixture. Too much fuel. HTH. -Jim
I disconnected the battery terminals and joined them together for five minutes, allowing the settings to reset (to default settings?) per a message i read on a Volvo chat sight concerning black sooty exhaust issues, and SHAZAM!, WHEN I RESTARTED THE CAR ALL WAS PERFECT! No idle problems, no rough runnng, no nothin'! I can't believe it. Volvo VooDoo, fer sur, mate.
That's awesome! Never heard of that before. I'll remember that for future reference! Thanks for letting me know. -Jim
It's a 2013 Volvo and you're touching the wire together? Take it back to the dealer and get it fixed under warranty. Touching wires didn't fix the problem, it cleared up some symptoms. Do you want to go around disconnecting the battery for the next few years?
Looking for a Used XC70 in your area?
CarGurus has 1,142 nationwide XC70 listings starting at $1,500.
Search Volvo XC70 Questions
Volvo XC70 Experts