Manifold Rattle ZT V6 160

crawfs · 6th November 2007, 12:59

Can anyone help??? The dreaded manifold rattle but with what appears to be different twist. I have repaired my VIS valve motor but still get the rattle. When it starts I remove the valve motor and simply replace it - that cures the problem for maybe a few days or a week, then it starts again. I am thinking that maybe the peg on the motor's cam is not a very good fit with the slot on the actuating arm and that maybe when driving I do something that makes the valve operate in a certain way (snap open, perhaps??) that dislocates the peg from the arm creating the rattle again. Has anyone any thoughts or has anyone come accross this before? The arm seems to slide in and out OK and doesn't flap about. I am now thinking that either I must replace the valve motor, manifold or both?

Keith · 6th November 2007, 15:03

Iirc the peg sits quite well in the slot more likely the motor is faulty sometimes resoldering the switches does not always fix them.

crawfs · 7th November 2007, 11:41

Thanks Keith - I'll try a new motor. Do you know if the sound is the same for a motor or manifold (ie non-rythmic rattle from the manifold itself) or does the motor sound different?

6th November 2007, 12:59	#1
crawfs Newbie MG ZT Join Date: Apr 2007 Location: Scotland Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Manifold Rattle ZT V6 160 Can anyone help??? The dreaded manifold rattle but with what appears to be different twist. I have repaired my VIS valve motor but still get the rattle. When it starts I remove the valve motor and simply replace it - that cures the problem for maybe a few days or a week, then it starts again. I am thinking that maybe the peg on the motor's cam is not a very good fit with the slot on the actuating arm and that maybe when driving I do something that makes the valve operate in a certain way (snap open, perhaps??) that dislocates the peg from the arm creating the rattle again. Has anyone any thoughts or has anyone come accross this before? The arm seems to slide in and out OK and doesn't flap about. I am now thinking that either I must replace the valve motor, manifold or both?

6th November 2007, 15:03	#2
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Iirc the peg sits quite well in the slot more likely the motor is faulty sometimes resoldering the switches does not always fix them.

7th November 2007, 11:41	#3
crawfs Newbie MG ZT Join Date: Apr 2007 Location: Scotland Posts: 5 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks Keith - I'll try a new motor. Do you know if the sound is the same for a motor or manifold (ie non-rythmic rattle from the manifold itself) or does the motor sound different?