The V8 Owners Forum -

I have a nasty rattle that has progressivly come on over the last week. Thinking it was the cat breaking up i seeked a second & third opinion from two commercial mechanics at work. One said one of the ends was knocking & the other said gearbox internals/ bearing. Seems too tinny to be ends knocking. Thinking the worst i popped into my local landrover supplier who said what i thought at first. Well cat section now removed, but cannot hear the noise over awsome engine noise from open manifold, so am asuming the cats are at fault. Oh, once removed i found sandy like powder coming from removed section. looking to fit classic r/r downpipes without cats & installing the o2 sensors as will run on gas at mot. Just not sure about thread size for sensors to make up the boss. Any thoughts??

Well took cat section to work today & jigged up & cut out cat to be replaced with straight pipe. Rattle gone now & it sounds like a V8 should , all be it a little hesitant. Got a nice popping sound when coming down off the throttle.

I'd guess the popping means it is over fuelling and then the fuel continuing to burn in the exhaust on the overrun

Worth checking it out as if it gets a bit more fuel the "big backfire" could shred your silencer

Ian