Black Smoke And Carbon Spitting Out Of Exhaust

[muzsky]

1996 R33 GTS-T

Recently installed a pod filter box and forgot to fully tighten a pipe clamp on a rubber elbow boot on the hot air intercooler pipe (exiting turbo into Intercooler), driving on a short loop of the F3 and heard a loud pop, lost all boost and power. Struggled for about 1.5km until it was safe to pull over (at 15km/h max). Looked under the bonnet and saw my error, luckily the rubber elbow boot and clamp were still there (but completely blown off the pipe (at both ends). Put it all back together (tightened this time) and drove home (about another 15 minutes), was a little sick sounding and idle searching.

2 weeks later without restarting the car, today it started OK, but blowing a hell of a lot of black smoke (at idle) and soot spray at rev's.

I've cleaned the aac valve and reset the idle (using "insu's" tutorial, thx); but still black smoke at idle and soot spray at revs; smells like it's running very rich (always was rich, but smells more so now).

Any suggestions???? Not game to take it on the road yet.

Oh mods include:

JJR 3” front/dump (heat wrapped), 3” Catco Hiflow cat with 3” Kakimoto catback exhaust, Blitz return flow Fmic, Blitz Sus Pod. Z32 Afm, Havoc Stainless 3” hard intake pipe out of turbo. Jecs 550cc Injectors, Walbro Gss342 intank fuel pump, Splitfire Coil Pack, Hypergear SS1PU Billet turbo with 15 psi actuator, Apexi Power Fc (with hand controller), R33 GTR Bov, boost gaige and turbo timer.

[Ben C34]

After the hose blew off the car would have been running crazy rich, so perhaps all the carbon and richness is leftover from that. If it was my car I would take out for a thrash and see what happens, I think it would clear itself. whether you do that or not is up to you

[scotty nm35]

You most probably fouled the plugs. Pressure test the intake to see if you have any other hoses leaking.

[SargeRX8]

Change the plugs. They will not last very long at all in a rich state. Then do as suggested, pressure test your intake. After you change the plugs warm it up and give it a few good revs and see how it responds then take it for a spin.

[hypergear]

O2 sensor failed? it did the same thing on my 180sx agers ago. Goto PFC console and check the o2 feed back. It should be running out of a cycle of reach and lean or afr +/- 0.5 around 13. If it stays consistent then needs to be replaced.

Alternatively you might have another split hose or some thing similar.

[muzsky]

Thx all for the responses, I'll check and replace the plugs. The O2 sensor is disconnected by the previous owner (just unplugged). I haven't reconnnected it, so not sure if it's faulty or was tuned that way. Will make a calll to the tuner to find out.

Stay tuned, just need to wait for the weekend to tinker.

[muzsky]

Hmmm....need help still???

Cleaned the AAC valve again, replaced the plugs (Iridiums, 0.8 gap), replaced the O2 sensor (it apparently was faulty), replaced the oil filter and oil.....still black smoke at idle and spitting black sooty oily smoke at rev's???? and smells very rich still.

Have also installed a D1Spec Oil catch can.

Oh also installed blue LED dash lights too (i got bored.....) Looks very cool.

How do I adjust the air/fuel ratio?

Will a good tune help or just a mechanic to diagnose??

[muzsky]

Oh forgot to add, how do I pressure test the intake? (as suggested by scotty nm35 & SargeRX8).

[Ben C34]

Oh forgot to add, how do I pressure test the intake? (as suggested by scotty nm35 & SargeRX8).

if you typed that into the search box you would get your answer instantly

[muzsky]

cheers bud will do that.

just bought a kit from www.turboboostleaktesters.com, anyone tried these as I couldn't be bothered making my own?

[Hadouken]

You must still have a boost leak somewhere. Check all piping, make sure they are all tight, maybe you have a split somewhere

[Ben C34]

You must still have a boost leak somewhere. Check all piping, make sure they are all tight, maybe you have a split somewhere

dude, his previous post just said he bought a boost leak tester, so i assume that's what he is going to do!

[muzsky]

correct superben, will be testing as soon as I get the gadget delivered from the States.

[R33shaun]

also check your afm, it might have decided its had enough at the same time as your pipe popped off coincidence like.

my 33 had the same problem and after considerable stuffing around I found my afm connector pins were dry jointed.

[MickoLis]

Another thing to check is the ecu temp sensor. It will cause similar symptoms.

[muzsky]

Got the Boost Leak Tester (image below), found a major leak in the BOV gasket (now fixed) and 2 small slow leaks in some hose clamps (clamps replaced). New plugs installed, cleaned the MAF sensor and everything else cleaned again. Car running much better but still a bit of black smoke and boost/turbo flutter above 10psi boost (was tuned to 15psi). Sounds to me like a air/fuel mixture issue. Time for a tune.

Had the bonnet up on Reservior road (near the quarry) on Sunday when another black skykline drove down the hill and tooted / waved at me. Cheers mate, looked up and waved, but you were gone. Love the skyline love.

Also added some photo's on the old and new blue dash LED's.