Jump to content
SAU Community

Recommended Posts

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 by Justin78
Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/
Share on other sites

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 by ToF
Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1680024
Share on other sites

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. :angry:

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 by Justin78
Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1680326
Share on other sites

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?

Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1680461
Share on other sites

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?

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

Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1681850
Share on other sites

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

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.

Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1691462
Share on other sites

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

Link to comment
https://www.sau.com.au/forums/topic/93086-black-smoke/#findComment-1691934
Share on other sites

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

    • That is surely the biggest gathering of Stageas in North America, ever!
    • Remember kids - if you can't afford to buy 2 GTRs......
    • I know people cry at the price of the Getrag 12-14k for a conversion now, but it really is a nice mid point. Not going to get change from 10k on a gearset installed.  $30k++ for sequential.   I know you run the risk of a damaged used one and parts are hard to get but as a street car gearbox its really hard to beat. If you enjoy a more traditional manual, its the choice no question.     
    • Time to decide what’s more import, your power level or your budget because you’re going to struggle to keep both 
    • Our Southern Highlands Cruise is proudly registered with “R U OK?” Day.  Sometimes the best way to check in on your mates is by getting out for a drive together. Sharing a common passion like cars creates the perfect space to chat, connect, and support each other.  A simple “R U OK?” can make all the difference. Let's enjoy the drive, the company, and look out for one another. PLEASE WEAR YELLOW FOR “R U OK?” DAY Sunday 14th September 2025 9:30AM Meeting Crossroads Homemaker Centre 10:00AM Cruise Departure Via Old Hume Hwy 11:45AM Arrival at Mittagong RSL Club Meet Location: Crossroads Homemaker Centre Final Destination: Mittagong RSL Club *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
×
×
  • Create New...