hmm ok, well there's no real way to check the cat(that I know of) other than removing it and shaking it to see if you can hear stuff rattling around inside of it, aside from taking it in and having an emissions test performed. The problem with doing so is that you run a great risk of snapping the studs off of the header. If that happens, which is pretty common, you have to drill them out and from what I've read it's a total PITA due to the angle and cramped workspace. Maybe you could try removing the oil cap while it's idling and see if that relieves some of the pressure or if the idle changes. Usually, the engine won't even idle if the oil cap is off, so put your hand over the opening and see if you feel pressure building up. |