ZT diesel exhaust fumes

rikk · 7th March 2021, 14:17

Hi, I've had a problem recently with my ZT where exhaust fumes were entering the cabin. I have found and fixed a couple of problems.. the small metal pipe that goes to the EGT value had split and has been replaced with a new one, and the flexi pipe in front of the CAT converter was also split and has now been replaced. However though changing these has vastly reduced the problem, there does still seem to be an issue. I've also changed the "PCV" filter but that made no difference. Is there anything else that I should check ?? thankyou

daveo138 · 24th April 2022, 13:47

Have you had any luck resolving this?

I had to be recovered from the A42 at Ashby yesterday, as exhaust fumes were making me drowsy.

I need to investigate.

RogerHeinz57 · 25th April 2022, 10:13

Assuming there are no leaks in the joints on egr valve or flexi section of exhaust, recheck the bolts securing the PCV filter housing, some folks dont change the seals when replacing the filter, and they leak. There are some other areas to check, oil dipstick tube - is the tube oily where it enters the engine crank case ? If yes, it may be blow-by gasses escaping from there, or maybe even the dipstick rubber seal may be compromised (Top of dipstick) Worth checking these areas as well as the oil cap seal for completeness, maybe worth just replacing it for the cheapness, seals dont have to look broken to not perform properly, they may only leak with pressure behind them when you cannot see it !
Good luck fellas !

Vossy · 25th April 2022, 11:41

I'm glad that I'm not the only one who has had this with a diesel.
I had mine on a ramp and went over it inch by inch along the exhaust, no signs anywhere of black soot but then I got to the back box, mine is still original and although the outer skin is going the inner is still in good shape, but right at the back where the twin pipes exit the box I noticed a small area of soot.
I can only assume that somehow the fumes are getting into the cabin from there. I have used a heat sealant on the area (no more than a large pinhole) so I will see how that goes.

7th March 2021, 14:17	#1
rikk Avid contributor Rover 75 CDTI Join Date: Mar 2007 Location: Ashby de la Zouch Posts: 104 Thanks: 3 Thanked 2 Times in 2 Posts	ZT diesel exhaust fumes Hi, I've had a problem recently with my ZT where exhaust fumes were entering the cabin. I have found and fixed a couple of problems.. the small metal pipe that goes to the EGT value had split and has been replaced with a new one, and the flexi pipe in front of the CAT converter was also split and has now been replaced. However though changing these has vastly reduced the problem, there does still seem to be an issue. I've also changed the "PCV" filter but that made no difference. Is there anything else that I should check ?? thankyou

24th April 2022, 13:47	#2
daveo138 Gets stuck in Rover 75 Tourer Join Date: Mar 2022 Location: Chesterfield Posts: 672 Thanks: 206 Thanked 69 Times in 53 Posts	Have you had any luck resolving this? I had to be recovered from the A42 at Ashby yesterday, as exhaust fumes were making me drowsy. I need to investigate.

25th April 2022, 10:13	#3
RogerHeinz57 I really should get out more....... A Reasonably Priced Car Join Date: Jan 2014 Location: Burton Latimer Posts: 2,530 Thanks: 408 Thanked 1,064 Times in 712 Posts	Assuming there are no leaks in the joints on egr valve or flexi section of exhaust, recheck the bolts securing the PCV filter housing, some folks dont change the seals when replacing the filter, and they leak. There are some other areas to check, oil dipstick tube - is the tube oily where it enters the engine crank case ? If yes, it may be blow-by gasses escaping from there, or maybe even the dipstick rubber seal may be compromised (Top of dipstick) Worth checking these areas as well as the oil cap seal for completeness, maybe worth just replacing it for the cheapness, seals dont have to look broken to not perform properly, they may only leak with pressure behind them when you cannot see it ! Good luck fellas !

25th April 2022, 11:41	#4
Vossy Why? ... MG ZT+ Cdti Auto saloon. Join Date: Jul 2014 Location: Blockeswich, South Staffs Posts: 1,549 Thanks: 173 Thanked 483 Times in 330 Posts	I'm glad that I'm not the only one who has had this with a diesel. I had mine on a ramp and went over it inch by inch along the exhaust, no signs anywhere of black soot but then I got to the back box, mine is still original and although the outer skin is going the inner is still in good shape, but right at the back where the twin pipes exit the box I noticed a small area of soot. I can only assume that somehow the fumes are getting into the cabin from there. I have used a heat sealant on the area (no more than a large pinhole) so I will see how that goes.