Rattle/whine under car

[DaveyDave]

Hi
When I get to 1800 revs the car makes a kind of roar/loud rattle sound and then disappears as the revs go higher or lower. Also, when starting the car from cold there is a rattle from low down at the back of the engine. I have just taken it to an exhaust specialist as I thought it was the Cat. They put it on the ramp and said the noise was coming from the bottom of the engine. Does anyone have any ideas as to what the problem is? Just lately there has been a whinig sound (a bit like a jet engine) coming from the bottom as I'm driving along. This only occurs on odd occassions, not all the time. I think it's all the same problem but not sure what it is. Has anyone else experienced anything like this.
Regards
Dave

Rover 75 Club SE 2.0L petrol.

[Mike]

First thing I would check is the flexi-joint connecting the exhaust manifold downpipe to the exhausts system. They are known to go and cause rattles similar to the one you describe.

hth

Mike

[DaveyDave]

Thanks Mike. Will check at the weekend.

[yelnats]

Member DAVY DAVE posted this problem some time ago .did he get it sorted?Does anyboby else have the answer?Somebody help,its driving me potty![bytheway its an04diesel]

[Dave Goody]

Member DAVY DAVE posted this problem some time ago .did he get it sorted?Does anyboby else have the answer?Somebody help,its driving me potty![bytheway its an04diesel]

I had a new cat fitted [cheapy] and get a noise at 2.200 rpm nothing before, nothing after. If you have similiar it will be exhaust /cat causing it.
I have learned to live with it:( Dave

[yelnats]

Cheers Dave-I agree,at this present time some things are more important,[like-will WBA avoid the drop?]

[prits_uk2002]

where is this flexi joint? mines is a mg zt 190 + kv6 manual , mines makes some clatter at thoose revs when pressing hard on accelaerator does mines have this flexi joint

[48rov06]

HI think i got same problem located noise as rear exhaust box Tapping box can hear something vibrate . Will come in above 1200 rev and disappear at 1900 but not allways could go for days then start on acceleration. Noticed M.P.G. down when noise present so i think box is rotting from inside out. Mind you it has not been there for over 2 weeks. ALAN

[WeeMan]

:shrug: http://www.the75andztclub.co.uk/forum/showthread.php?t=29307 have a look at this, could just need the bolt tightened but now sure about the roar your describing.