Welcome back inside the friendly confines of Fort NOx! As you may recall, last month’s issue featured a Honda which had failed the I/M 240 test for excessive NOx. This month’s car, a 1988 Volvo 240, was also an I/M 240 NOx failure. While the owner of last month’s car had insisted there were no driveability problems, and had blissfully ignored the car’s persistent pinging, the Volvo’s owner readily acknowledged a lack of power. He also told us that his car pinged badly under all conditions unless he used high octane fuel. Even on high-test, the Volvo still pinged mildly on acceleration.