New exhaust fitted STILL exhaust smell in cabin

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Mukiwa

Well-Known Member
Hi all,

NEW full exhaust fitted. Still getting the smell in the cabin, but it's only obvious when I boot it over 70mph

I'm guessing exhaust manifold (but I can't see anything there) or some sneaky rubber pipe.

Any ideas please? I want to drive it not die in it.......

cheers all :)

I have done a search before I posted this and can't find anything similar :cool:
 
Diesel 2.5 tdi. 70 on the clock is not quite 70 for real.

I noticed it when overtaking mate to get past the middle lane and lane 3 hoggers - you know the type, I can do 55mph and I'm sticking to it. Funny thing is they are usually in V8 Vogues
 
Diesel 2.5 tdi. 70 on the clock is not quite 70 for real.

I noticed it when overtaking mate to get past the middle lane and lane 3 hoggers - you know the type, I can do 55mph and I'm sticking to it. Funny thing is they are usually in V8 Vogues
I'd look at the flexible section on the down pipe from the turbo and the joint to the turbo.
 
If it only happens at speed check the rear hatch seals - big lumps of a car like the Rangie will leave a low pressure zone behind the vehicle at speed sucking up exhaust gases which could find their way into the cabin if the rear hatch seals aren't sound.
 
The cabin is reasonably well sealed, only places gas could get into it from engine bay are loom grommets or heater pipe grommet. If those are sound take a look at rear bonnet seal and hinge seals. Gases could be coming past that and be being drawn into heater circuit through scuttle fresh air vents. Air comes in at front of cabin and exits through vents in the tailgate any depression caused by airflow at the rear would cause air to be sucked from the cabin via the vents rather than into it, as the cabin will have positive pressure. Important thing is to find where the gas is leaking from. :);)
 
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The cabin is reasonably well sealed, only places gas could get into it from engine bay are loom grommets or heater pipe grommet. If those are sound take a look at rear bonnet seal and hinge seals. Gases could be coming past that and be being drawn into heater circuit through scuttle fresh air vents. Air comes in at front of cabin and exits through vents in the tailgate any depression caused by airflow at the rear would cause air to be sucked from the cabin via the vents rather than into it, as the cabin will have positive pressure. Important thing is to find where the gas is leaking from. :);)
When the exhaust failed on mine, there were certainly no fumes in the cabin, that's why I was thinking turbo to exhaust connection or the flexi allowing gasses up and into the heater intake.
 
When the exhaust failed on mine, there were certainly no fumes in the cabin, that's why I was thinking turbo to exhaust connection or the flexi allowing gasses up and into the heater intake.

Yes would think there has to be a leak around the manifold, turbo, EGR.
 
If there's somewhere nice and quiet nearby where you can make some smoke unnoticed, pull off a hose and pour some brake fluid into the inlet manifold downstream of the maf. Stuff some rag up the exhaust outlets and start her up - you now have a 4.6 litre smoke bomb! Any exhaust leaks should be evident by the escaping smoke. There shouldn't be any exhaust gases in the engine bay - that's what the exhaust system is for.

I still think it's coming in the rear hatch as it only happens at speed!
 
Hi

I had a similar problem and as Steve says a careful look around the rear seals is a good Idea as is did cure the diesel whiff.

Look for distortions around the bottom corners and the general condition of the rear hatch seals
 
If there's somewhere nice and quiet nearby where you can make some smoke unnoticed, pull off a hose and pour some brake fluid into the inlet manifold downstream of the maf. Stuff some rag up the exhaust outlets and start her up - you now have a 4.6 litre smoke bomb! Any exhaust leaks should be evident by the escaping smoke. There shouldn't be any exhaust gases in the engine bay - that's what the exhaust system is for.

I still think it's coming in the rear hatch as it only happens at speed!

Not really good advice, he has a diesel. :D
 
If its the same engine I'm thinking if then yes. It's a common problem in bmw's but I think its more common with the pressed steel manifolds over the cast ones.

No pressed steel manifolds on the M51 fitted into P38 Range rovers. Are you thinking of M53?
 
No pressed steel manifolds on the M51 fitted into P38 Range rovers. Are you thinking of M53?

It could be, Both that iv changed were on BMW's, 1 pressed steel and 1 cast the cast one only had a small crack. The pressed steel one had multiple cracks. It may not be an issue on range rovers but its still worth checking.
 
If it only happens at speed check the rear hatch seals - big lumps of a car like the Rangie will leave a low pressure zone behind the vehicle at speed sucking up exhaust gases which could find their way into the cabin if the rear hatch seals aren't sound.

There is a tear / split in the rubber bottom left hand side on the main body of the panzer. More investigation required!

:rofl:Thanks
 
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