I managed to catch my back box on a speed bump about 2 weeks ago, the resulting crunch severed the tailpipe and adjoining silencer very neatly - I now have a very stealthy hidden exhaust! At the time, I removed the hanging box and continued home, however, whenever I came rolling to a stop (dip the clutch) the engine would simply die.
Since then I've ordered a nice Ragazzon unsilenced tailpipe to replace the missing section. It was on my upgrade list so I don't feel too cheated by my bad luck. Hope to have it fitted by next week. But getting back to my concern, would the loss of the back box cause the engine to die at low revs? less back pressure or something?
My gut feeling is that the loss of the back box has nothing to do with the engine dying issue. I'm also hoping that it's not a MAF problem as the general consensus seems to be that MAFs tend to show up problems higher in the rev range and not at idle, also when a MAF is gone it doesn't tend to fix itself intermittently....
So, dirty airfilter - possibly? But what about the Lambda? I thought I read somewhere that Lambdas can cause idle problems at the end of there lives. Some days, the car drives fine for short trips, other days it's got a mild kangaroo effect at low revs (sub 2K rpm), almost like a slipping clutch or running out of fuel. Sound familiar to anyone?