Jump to content
SAU Community

Recommended Posts

Hi guys,

First up I own a 98 R33 S2 GTS25T Skyline with the following mods:

HKS Cat back exhaust

De-cated

Pod Filter

GFB Hybrid BOV

I've noticed a oily smell incabin... partically when i'm slowing down or have just been giving it a bit of stick. I changed the oil about 4,000km's ago with Shell Helix 5w40. This problem has only seemed to arise since I've de-cated the exhaust?

Any ideas what it could be?

Link to comment
https://www.sau.com.au/forums/topic/214551-r33-s2-oily-smell-incabin/
Share on other sites

Check that you haven't caused any exhaust leaks during your decating process (did you replace gaskets) Do this by letting the system cool down completely and rub 50/50 dishwashing liquid and water over the flanges. Then start the car and look for bubbles...

Yeah, I'm not sure about the gaskets - An exhaust guy fabbed it up and installed it.

I guess I'll jack my car up tonight and unbolt it and have a look.

Cheers mate, also I was looking at some Fuchs 5w40 oil, whats that like for a RB25DET?

Edited by dekodE_

FWIW there are heavy penalties for removing emissions equipment (ie decat) for a car that's used on the road. A high flow (magic cat/metal cat/catco) style cat shouldnt restrict power at all on your setup, and will reduce the smell and the amount of black crap that will end up on your rear bar.

you may also have a leaking rocker cover gasket. usually passenger side. the oil gets onto the block, and when boosting around, the higher block temps burn the oil and you can smell it quite a bit.

what the f is FWIW?

lol ...for what its worth

Edited by Munkyb0y
Fuchs is fuching good stuff! :) Pricey but worth it.

Sweet, I think its about $79 for 5L which isn't too bad. I might grab some tommorrow.

Had a look in the engine bay for any leaks, and tried to "sniff for oil" couldn't find anything.

Then I took the car out for a spin, It was only really noticeable once I had come to a stop (So i'm still thinking it's an exhaust leak as first suggested, guess I'll jack the car up tommorrow and check it out.

My current oil level hasn't changed, and my car doesn't smoke at all, even on boost... :laugh:

Edited by dekodE_
The rubber seal around base of your gear shifter might be split. That will give off an oily smell in the cabin.

exactly what i was goin to say..my car had a short shifter in it when i bought it but i didnt like it so i bought a gtr shifter to replace it..when i went to take out the short shifter i found the previous owner had put a tea towel around it to stop oil spiting out which stoped the smell getting to the cabin and the short shifter had no seal..so i had to buy a seal from nissan when i put the gtr shifter in and i removed the tea towel..i had an oily smell in my cabin for round 2 weeks but its gone now :D

Interesting idea's being thrown about when OP said...

...This problem has only seemed to arise since I've de-cated the exhaust?...

Every cat'less car i know has a particular smell to it. Hard to describe. When idling, and a breeze blows the fumes into the cabin, smells kinda oily i guess; sure its not just that?

If your sure it only started when you ripped the catback off, smashed the china out of the cat and shlaped it back on... then start there first.

LoL @ Luciano_GTST.... Google will tell you all abbreviations ;)

Edited by GeeTR

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • No, code 21 is very straightforward. It can only be the things described in that diagnostic flow. In fact it has no way of knowing that the spark plug resistance is out of spec.
    • Hi, SteveL Thank you very much for your reply, you seem to be the only person on the net who has come up with a definitive answer for which I am grateful. The "Leak" was more by way of wet bubbles when the pedal was depressed hard by a buddy while trying to gey a decent pedal when bleeding the system having fitted the rebuilt BM50 back in the car, which now makes perfect sense. A bit of a shame having just rebuilt my BM50, I did not touch the proportioning valve side of things, the BM50 was leaking from the primary piston seal and fluid was running down the the Brake booster hence the need to rebuild, I had never noticed any fluid leaking from that hole previously it only started when I refitted it to the car. The brake lines in the photo are "Kunifer" which is a Copper/Nickel alloy brake pipe, but are only the ones I use to bench bleed Master cylinders, they are perfectly legal to use on vehicles here in the UK, however the lines on the car are PVF coated steel. Thanks again for clearing this up for me, a purchase of a new BMC appears to be on the cards, I have been looking at various options in case my BM50 was not repairable and have looked at the HFM BM57 which I understand is manufactured in Australia.  
    • Well the install is officially done. Filled with fluid and bled it today, but didn't get a chance to take it on a test drive. I'll throw some final pics of the lines and whatnot but you can definitely install a DMAX rack in an R33 with pretty minor mods. I think the only other thing I had to do that isn't documented here is grind a bit of the larger banjo fitting to get it to clear since the banjos are grouped much tighter on the DMAX rack. Also the dust boots from a R33 do not fit either fyi, so if you end up doing this install for whatever reason you'll need to grab those too. One caveat with buying the S15 dust boots however is that the clamps are too small to fit on the R33 inner tie rod since they're much thicker so keep the old clamps around. The boots also twist a bit when adjusting toe but it's not a big deal. No issues or leaks so far, steering feels good and it looks like there's a bit more lock now than I had before. Getting an alignment on Saturday so I'll see how it feels then but seems like it'll be good to go       
×
×
  • Create New...