Black Smoke

[Justin78]

When i accelarate and then de- accelarate black smoke pours out of the exhaust. It has not done this before.I have just installed a k&n air filter and had the timming belt replaced, would this have anything to do with it ?

Also

Does anyone know what the oil pressure should be at idle and when running

Edited October 31, 2005 by Justin78

[ToF]

Black smoke generally means it's running rich which is good I guess.

It could be running richer now possibly because the timing was adjusted when the timing belt was changed or the AFM was tampered with when the air filter was installed.

A little black smoke while pushing it is normal for most jap cars as their ECUs were tuned to run slightly rich. So I don't think there's anything for you to worry about.

Edited October 31, 2005 by ToF

[Justin78]

Black smoke generally means it's running rich which is good I guess.

It could be running richer now possibly because the timing was adjusted when the timing belt was changed or the AFM was tampered with when the air filter was installed.

A little black smoke while pushing it is normal for most jap cars as their ECUs were tuned to run slightly rich. So I don't think there's anything for you to worry about.

<{POST_SNAPBACK}>

Cheers mate

Is there anyway of leaning it up slightly.

I dont have any surging so i guess it cant be to rich ( i dont know), there sure is a fair bit of black smoke when the blow off valve releases

Edited October 31, 2005 by Justin78

[Links]

Black smoke usually shouldn't be coming out unless your really punting it hard or maybe just when you back off the throttle and it's dumping excess fuel into the system..

is it diong it while you are idling - or mainly pushing hard..

Best way to check A/F ratios is put the thing on a dyno.. also get a conzult cable from someone and check that your O2 sensor is working correctly and that it isn't just defaulting to running rich..

Doesn't sound like there is too much of an issue, might just need to be cleaned up a bit.. also maybe change your fuel?

[Justin78]

Black smoke usually shouldn't be coming out unless your really punting it hard or maybe just when you back off the throttle and it's dumping excess fuel into the system..

is it diong it while you are idling - or mainly pushing hard..

Best way to check A/F ratios is put the thing on a dyno.. also get a conzult cable from someone and check that your O2 sensor is working correctly and that it isn't just defaulting to running rich..

Doesn't sound like there is too much of an issue, might just need to be cleaned up a bit.. also maybe change your fuel?

<{POST_SNAPBACK}>

I started it up this morning drove it down the road and it just stalled and would not boost.

I ended up taking it to the workshop put it on the dyno and still the same problem not boosting, no power, and black smoke, after all this it ended up being that the cat converter had sh*t itself and was blocked stoping all airflow

Thanks for your help

[B0oStEr]

Make sure the blocked cat was not just a symptom of running too rich otherwise the new cat could suffer the same fate.

[Justin78]

Make sure the blocked cat was not just a symptom of running too rich otherwise the new cat could suffer the same fate.

<{POST_SNAPBACK}>

If its running rich can it screw the cat up fairly quickly or does this happen over time

[shanef]

i had this exact problem recently.

My fix was a new set of spark plugs and to tune the power fc i had waiting to be put in.

Now she runs nicely at 180.2 rwkw

[Justin78]

If its running rich can it screw the cat up fairly quickly or does this happen over time

<{POST_SNAPBACK}>

Edited November 4, 2005 by Justin78

[Justin78]

If its running rich can it screw the cat up fairly quickly or does this happen over time

<{POST_SNAPBACK}>

What spark plugs did you put in and what gap where they set at.

Im also getting alot of backfiring since the cat change does anyone know why it would do this or does this lead to it being rich again.

[Nathan_G1]

My skylines running hell rich under full boost, cant remember the exact air/fuel ratio but it was hell high, they told me to get a Power FC or something similar so they could lean the mixture a little, under full boost and the richness made 179rwkw with VG30, got told the PFC would get me to 200+ no worries. Cars generally backfire after high revs during a down shift or going off acceleration, shouldnt be too much to worry about