Rough Idle, Major Backfiring And Grey/blue/whitey Smoke

[Mr_GaZZa]

Hey guys!!

my r33 GTS-T is running rough on idle.. its about 650-700 rpm idle.

when driving it... its doggish till about 4000rpm! still aint that great... you can here

this hissing and ticking from the turbo air being sucked ?! is that normal?

i mean its boosted @ 8-10psi atm and the guy who tuned my car to 10psi said its running pretty lean on the

bottom end of things... but got better up the graph.

when checking n regapping my spark plugs about 2,000k ago i noticed a few WHITE tipped plugs?! rest where okay.

also i have had the WRX symtom come n go randomly...

could this be coils? or a few dodgey spark plugs??? fuel??

i still get g00d Km's 'last 2x tanks have been 450km'.

but when i am booting it atm... starts kicking out smoke grey/blue/whitey, the more its booted the more grey/er it gets

i had a comp test done 2000k ago and was 170psi ish or sumfing wif maybe 5psi difference across the board!!

could i be fuel pump? injector/s? coil/s? CAS? AFM?

i mean i aint ever changed the fuel pump... and i have had the car 4#,### km

PLEASE help... its RAWR and its also backfiring sooo bad... like if 1 chamber aint denotating or sumfing...

=(

NOTE!!! and also around the first few injectors or pipes there i can here a HISSING 'LEAK'?

Edited October 22, 2007 by Mr_GaZZa

[Ionos]

Sounds like it could just be a boost leak. Check all your intake piping and joints for splits, or anything that is loose/come off.

[Mr_GaZZa]

Thanks Iono's i'll check that out 2nite ...

umm Nissan had a look during my lunch break... and i just been told its spark plug / coil problem and that its miss firing

the blue/white smoke smells sweet... like fuel

=(

[Ionos]

Thanks Iono's i'll check that out 2nite ...

umm Nissan had a look during my lunch break... and i just been told its spark plug / coil problem and that its miss firing

the blue/white smoke smells sweet... like fuel

=(

That's also possible, but generally spark plug/coil problems won't cause an issue with idle. Normally you'll only see problems under boost.

Check your pipes still first as this won't cost you a thing. How long since your plugs were changed?

[aphid]

sounds like a combination of a few problems.. hissing sound would be a boost leak for sure, it it's coming from around the injectors make sure the injector O rings are seated in the manifold properly, if it smells like fuel at all around there this would probably be your problem..

the "WRX symtom" is more than likely a loose or dirty plug on one of the coils, or perhaps the transistor pack (if it's a series 1) ontop of the cam cover ornament..

blue smoke is usually oil, but if it smells like fuel then you probably mean black smoke, which would indicate the engine is running rich, which also points back to a boost leak

hope i helped,

marcus

[lighty01]

could also be your computer. one of my close friends car was running like yours, he reset his computer and it started working fine again.

Edited October 22, 2007 by lighty01

[dmr]

blue smoke is oil, black smoke is fuel, and white smoke is cold.

if it's getting worse as you boot it harder it may even be turbo related. i'd put that into consideration also.