Black Smoke, whats normal??

[paulm958]

Just purchased a HJ 75 1995 4.2 diesel update tray ute for the young bloke, and we are very happy with it,
We just got back from spending a weekend in the Avon wilderness, i was in my mates Hilux following the cruiser up and down some pretty decent hills and noticed on most of the decents when he would excellerate to go back up the hill it would beltch black smoke only for a few seconds,
i should add its done 200k and is fitted with a Safari turbo,
just wondering if thats normal

[tweak'e]

proberly no boost compensator so its overfueling before the turbo provides enough air.
having said that, most will give a puff on sudden load change or sudden stomp on the pedal. depends on if its just a small puff or pouring it out.

[beinthemud]

A smokey Diesel tends to be one in need of a service or hasnt been Dynoed and needs to be tuned
If you havent turned up the pump then id say it needs a tune
and a service
change the oil and filter put some heavey duty oil stabalizer in it and get a dyno

[SIMMO84]

Smoke means horsepower Chicks dig smoke too.

[beinthemud]

Smoke means horsepower Chicks dig smoke too.

Smoke = wasted fuel
If smoke is unburnt fuel how could it mean power never seen anyone dynoing there exhaust

Chicks dig the stuff I cut on a mirror Chik chik boom

[paulm958]

if you mean oil / filter service, its just been done, and was told oil changed every 5,000kmhs,
the black smoke appears to be unburnt fuel, as mentioned it only lasts a few seconds and doesnt blow any once under load or holding a steady pace,
Does this seem exceptable or should i have it looked at?????

[beinthemud]

Yeah mine does abit when I berry the throttle in first

[beinthemud]

It dosent sound excessive mate

[dumbdunce]

tweak'e is on the money. if it only smokes for a few seconds on acceleration it is because it has been "tuned" for the aftermarket turbo and until boost builds, there will be excessive fuel and therefore some black smoke.

you can

(a) live with it

(b) turn the fuel down which will result in less smoke, but also less power

(c) have a boost compensator installed on the fuel pump at a cost of about $2000. many shops will probably insist on also doing a pump overhaul (+$1000 to 1500), an injector service (+ $400) and a dyno tune (+ $200) at the same time.

I recommend option (a). if the vehicle is going to do a lot of stop-start suburban driving or a lot of offroad, the 5000km oil and filter change interval is critical. If it is going to be used mostly on the highway, it will survive with 7500km oil changes, you don't need to panic if it goes over 5000km on a trip or something between changes.

[Toy80Diesel]

I've also got the 1hz with aftermarket turbo and I find it depends on your driving style. During take off, give it a slight rev before letting out the clutch and it'll smoke less. I find if I just let the clutch go without an initial bit of accelerator, I get more smoke. Also, if you are rolling and try to get moving again in second, you get more smoke. Just slow down a little more and get back into first for a few seconds, then go second gear, you'll get less smoke. I find I get more smoke off boost, when trying to take off and obviously more fuel is getting in than can be burnt, until the turbo spools up.

The turbo installer said to me, if you see the smoke at night in your rear view, it's because the car headlights (following you) will highlight the smoke and it looks worse than it really is.

I don't think your situation is any different to mine, unless you need to look at your injectors!