Decats and fumes

[nissanman312]

Hi guys the fumes in my cabin are getting very strong is this a trait of decats Or should I be looking at exhaust leaks?

 

My freinds run them and don't struggle with this

[Richf]

You need to check for leaks , you shouldnt smell anything in the cabin

[Bodyboarder81]

I do mate with mine ..... If you drive normally you don't notice it . Seems to smell a tad more when you're booting it . After the catch cans it vents to atmosphere so you will get a smell from that as well . I have 0 leaks in my exhaust system .

[nissanman312]

This is strong and it's the same smell from the back of the car fuel for sure

I know you get a bit of a wif bit this is strong

[Bodyboarder81]

Mine has always done this since the decats being fitted . So if yours hasn't then I guess it suggest that's something's changed ?

[Bodyboarder81]

Maybe the colder weather ... Running rich ?

[Richf]

I never smell anything with mine not in the cabin

[Bodyboarder81]

I never smell anything with mine not in the cabin

 

Do you run a catch can ? And are you also supercharged ?

[Richf]

No but if you have a vent to air catch can then it will smell.

 

Not supercharged but that shouldnt make any difference , exhaust fumes in the cabin is something that needs looking at

[Tricky-Ricky]

Exhaust smells in the cabin are usually due to small leaks in the exhaust manifolds or the joints from manifold to down pipe, never had any smells that where not the result of a leak on any of my cars, turbo or N/A.

 

Also a good idea to rout catch can outlet back to intake or at least pipe to under the car to avoid nasty niffs.

Edited November 29, 2015 by Tricky-Ricky

[nissanman312]

Cheers guys I shall get the car up and check for leaks

 

If all bolts are tight what's the best way if leaking on joints ? Bit of sealer

 

Those 2 bolt joints never seal to well

[Richf]

http://www.ebay.co.uk/itm/V-Tech-Vital-Copper-High-Temperature-RTV-Quality-Silicon-Instant-Gasket-VT-153-/252015447128?hash=item3aad4a8c58:g:7pgAAOSwMmBVlncS

 

I've always found this stuff to be good , just smear the gaskets with it and re fit

[nissanman312]

Looks good and it's Vtec yo!

Cheers guys

[GMballistic]

This is strong and it's the same smell from the back of the car fuel for sure

I know you get a bit of a wif bit this is strong

Does it actually smell strongly of petrol though?

 

I had a similar problem with my car at one point, ...I put it down to the De-Cats at first but as it persisted I investigated it further. Turned out I had a fuel leak in my engine bay coming from the FPR (fuel pressure regulator) which was dangerously dropping fuel onto the exhaust pipes/manifolds below.

 

I fixed it by having a new pipe made for the FPR as the old one had developed a hairline crack which was the cause of the fuel leak. Very dangerous but luckily I found the leak.

[nissanman312]

This is strong and it's the same smell from the back of the car fuel for sure

I know you get a bit of a wif bit this is strong

Does it actually smell strongly of petrol though?

 

I had a similar problem with my car at one point, ...I put it down to the De-Cats at first but as it persisted I investigated it further. Turned out I had a fuel leak in my engine bay coming from the FPR (fuel pressure regulator) which was dangerously dropping fuel onto the exhaust pipes/manifolds below.

 

I fixed it by having a new pipe made for the FPR as the old one had developed a hairline crack which was the cause of the fuel leak. Very dangerous but luckily I found the leak.

 

It's smells more like strong burnt fumes

But I will investige that one cheers

[GMballistic]

No probs & just thought it was worth mentioning just in case. Keep us all informed if you get to the bottom of it if you can.

[Toon Chris]

Have you taken off any heat shielding? Maybe its getting very hot and melting the underseal in places? That really whiffs.

[veilside z]

Do you still get it if you turn the heater control to the Fresh option, opposed to Re circulate mode?

[nissanman312]

Yeah get it worse on fresh

But not with ac on

 

I know you get fumes with de cat but unless there's a leaking joint it should be making its way out the back you would of thought

[dajw]

Interesting! I've got what I've always thougth is a 'decat smell' with mine too, ever since running the Stillen SC (I had test pipes done at the same time).

 

Smells a bit fruity, particularly at idle/cold start and of course if reversing, so I have put it to just fumes from the back.

[nissanman312]

Yeah it's just far worse than it was

I think it may just be a bit of a leak further up towards the cabin