Noticed over the last few months I've been getting a tinny buzzing noise coming through the dash, at between 2500 and 3500 revs. Disappears after
3.5k.Been told it sounds like the baffles of the centre box have collapsed and it is resonance. Sounds about right, definatley, something resonating, but I thought it was something on the firewall.
But the last few days, I've noticed that it has been only making 6PSI most of the time, and only occasionally making 7 or 8 in 4th and 5th. (Should make 6 PSI in first and 2nd and 8 in 3rd upwards)
Tonight coming home from work, it all felt a little bit flat, and defiantly noiseier than normal, but not from anywhere in particular.
Thought I would try a little test. Started it up (Still a little warm). Covered both tail pipes, first with a pair of builders gloves, then with a piece of wood big enough to cover both pipes, pressed on hard.
Engine kept running as normal, exhaust sounded muffled, but not even the slightest hint of stalling.
I do have a slight blow on the exhaust manifold, but that closes when warm anyway, and if just one cylinder is leaking at the manifold, you would expect it to stumble on the still sealed cylinders.
Does it sound like a big rotten hole somewhere in the exhaust?
MOT is due at end of June, so I'm starting to get sorted, the stuff that is likley to cause problems, and the exhaust seems the main one.