Engine cut out repeatedly on highway (65 mph),terminating in limp home mode
It's a 2004 XC70 with just under 100.
I was on the Interstate doing around 65 when it started to cut out. It was as if the engine stopped running for a second, then started right up again for a mile or so, then did it again repeatedly, each time seeming a little worse. Toward the "end" the dash lights went out each time, until finally they went out completely. At that point I had already pulled off the exit on to a main road paralleling the interstate.
By this time, the car, while still running, was more or less in "limp home mode." I couldn't go over 40, the dash lights were out, and the signals and windows would not work. I was close enough to get home, and fortunately did NOT get pulled over by the cops for not signaling.
The next day it started up just fine, everything worked just fine except for an "urgent air bag message." I drove it to my friends shop. They are equipped with Volvo diagnostic software, but they could find nothing wrong with it. They reset the computer and told me to drive it around and see how it did from there. That meant that I was afraid to drive it some 300 miles to visit some friends over from Europe, and I had to take my van (no fun there).
I did a search and found a member with vaguely similar cut-out issues, and his remedy seemed to have been to replace and clean out the PVC system. Does this sound about right in my case?
The nearest Volvo dealer is about 75 miles from here, and the nearest Volvo specialty shop is about twice that far, and I don't feel comfortable making that trip.
Any advice would be greatly appreciated.
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