R33 Skyline Problem

[moz09]

Hi hows it going,

I currently have a Nissan Skyline r33 Series 2 gts-t, its got a few issues with it currently, it currently has a Front Mount Inter cooler, used to have a HKS Blow Off Valve but replaced it with the stock one. It has a 3" Full Exhaust, as well it has a Automatic boost controller however its got the display sort of smashed, so going to replace it soon with a manual one it as well has a turbo timer.

One of the issues is that its blowing black smoke and there and its leaking the black stuff from the exhaust onto the floor, also there is sense of a strong smell of petrol. My assumption its running quite rich, so im guessing could it be due for a tune, or it might be running too much boost but ive reved it ideling and it has been showing the 7 pound of boost. The car is currently unregestired however its never been driven, so dont if reving the car shows its real boost.

My 2nd question is, the oil is pretty much black, so would that mean its time for a oil change and oil filter change.

My 3rd question, is when sometimes its ideling it turns it self off so i was wondering could this be miss fires, or is it just due for a tune. Because im thinking maybe i need to replace the spark plugs. Also when its been slightly reved on a warm engine, sometimes it will shut off and wont turn back on until you give it about 5mins and it will start right back up. If i start it up straight after it will struggle to start up sort of like an old car.

If you could help me, it will be greatly appreciated.

Yours Truly,

Moz09

[Hanaldo]

Get the O2 sensor checked, most common cause of running rich.

Oil shouldn't be black, so definitely change that. I would personally change it anyway as you don't know what the previous owner had been using.

When you returned the bov to stock, did you plumb it back properly or is it venting to atmosphere? If it is venting to the atmosphere then that could also be the cause of the car running rich

[LANDSCRIBBLE]

im in the same boat buddy, all these mods throw the air/fuel ratios out of whack and, will cause the car to run richer. start saving up for an ECU .

and +1 for oil and filter change.

[Hanaldo]

Cooler and an exhaust shouldn't affect the AFR's too much, the stock ECU can adjust to them

[snozzle]

sounds like you have a mild vacuum leak sumwhere, check all vacuum lines, intercooler pipes etc

if that fails, check your air flow meter (borrow sum1 elses and fit it to see if it still runs the same)

if that fails, post here again and ill keep thinking, theres lots of things i can list but some more obvious/easy things to elimate first before the not-so easy stuff has to be checked, like injectors etc

[stormtrooper]

Sounds like a combination of running rich and a vacuum leak as snozzle said (I'd be trusting his opinion on this, he's a champ ) I'm wondering, when your car "dies/turns itself off" does it hunt for a bit before it does? By that, I mean do the revs at idle just start going out of whack and then stall? If so then I'd definitely say vacuum leak somewhere. If this is the case, you can use something like carby cleaner and spray it around the intake manifold and pipes beforehand, you'll hear if it is

[syfon]

Change the oil+filter, change the fuel filter, replace the spark plugs.

Tune the car.

Get it rego'd.

Go do burnouts.

[stormtrooper]

................ and post videos of said burnouts........ or fail

[bubba]

................ and post videos of said burnouts........ or fail

+11ty skidvidz ftw!

[CaM!]

Alright guys this is Moz09 however i have left the settings on my other computer which is out of use for now so using a mates account temporarily.

Anyways i found the vacuum issue as it was down to my boost controller vacuum line as it wasn't the right size one and was leaking, so ive replaced that now.

So this issue has been fixed, Ive as well done an oil and oil filter change.

However i still have stall's when its idling and its running rich still and still has backfiring issues when running idle, like you can actually feel the backfiring when your sitting inside.

Although I have thought about getting new spark plugs, but i don't want to chuck away money just yet, because i might not sure if new spark plugs will cause these stalls.

I haven't replaced the automatic boost controller yet, as i think it could be down to the automatic boost controller as sometimes the car wont rev past 2.5k and my mate told me its called a leap mode, so im going to replace it this week with a manual one and see if it fixes it.

However im still not 100% sure if it will fix the stalls, i am more interested in fixing the stalls currently rather then the car running rich and backfiring, however if you have any suggestions what could be the cause of the back firing and stalls as well it running rich.

Im guessing maybe the running rich issue is down to the ecu as i know the stock one does run rich but would the backfiring be the cause as well or?

I also have one more problem, sometimes when you actually let it warm up to like an operating temperature and you give it gas to about 4k, it will sometimes just shut off immediate would this be a cause of a another vacuum leak or misfire?

[Dorigecko]

6x $5 is not exactly throwing money away. if it has to be done, it has to be done.

of course, get c-red to do it.

You'll come back with an extra 30ps.

[CaM!]

I thought i had to buy those iridium ones which cost roughly $120, if i can buy those normal ones then ill do that, thanks for the help.

[bubba]

Coppers are just fine.

[CaM!]

Hey hows it going, i switched today to the manaul boost controoler, im going to go tomorrow to buy some copper ones, however i eliminated the black exahust smoke problem as it was running quite a bit high boost before.

However i still tend to get a bit of a struggle around the 2.5k-3k mark when it comes to reving it as it will strugle to go past that so im guessing some sort of vaccum problem, however i looked at all the cables and intercooler piping and cant really find a leak.

Does anyone have any suggestions were i should look else?

[Socrates]

Does it have a pod filter? or factory air box

[CaM!]

yeah it has a HKS mushroom pod filter.

[Socrates]

I read somewhere about a small vacuum / airhose that used to go air box that if blocked, caused the car to to have a flatspot at the above rpm.

Try find a blocked hose or if someone else can elaborate cause its been 5+ months since i saw the thread with this info.