Outer Limits 4x4 Board

Hey pros,
I got A 91 rocky. when I rev her hard to 4500 or so, i got some black smoke. It isn't dark dark smokke, just darker themn usual. Is it bad. What is it. And what do I do? thanks, Dan

Hey mate... you're not trying to elect a pope are you?

It could just be the quality of diesel you put in your tank. A mate of mine has a diesel bundera and the colour of his smoke changes every time he fuels up.

Dangerous Dave wrote:It could just be the quality of diesel you put in your tank. A mate of mine has a diesel bundera and the colour of his smoke changes every time he fuels up.

I think Purist is in the US???

Therefore he drives a Feroza (US Rocky)???

Black smoke on a petrol engine = $$$

yes, hes in the states and hes refering to a feroza.... black smoke... hmmmm... how miles are on it dan? also, does it happen when u accelerate, deceleate, or consistant? if its under accelleration/decceleration, then it could be ur valves goin out or needing to be reseated.... if its consistant, ur piston rings are goin bad.

Is it using oil?

Could just be over fueling??

murcod wrote:Could just be over fueling??

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i agree, black smoke normaly indicates rich fuel mixtures.


i get smoke when i rev hard, blue/grey though and yes it does use a little oil. i'll put a rebuild kit through it oneday. haha

tufferoza wrote:

murcod wrote:Could just be over fueling??

'
i agree, black smoke normaly indicates rich fuel mixtures.

hmmm.... likely jus a rich fuel mixture then from what you guys are sayin... depending on the miles, i would suggest havin the valves reseated. may fix ur problem. also check ur oxy sensor. that could be a big issue.

Do a compression test to rule out the rings or valves.

I always thought that white smoke is indicative of a rich fuel mixture

no.. white smoke indciates a healthy combustion i believe..... blue smoke indicates a rich oxygen mixture while black smoke indicates rich fuel mixture.

I'm going to call it Blue. Sorta navy though. It only happens when I rev hard, to get that extra oomph up a hill.
Dow you guys just have all the equipment to test this stuff? or do you have to take it to a shop? I can do basic work, but I don't have a ton of specialized tools.

and it may be usin oil. After I bought it And did the oil change, the oil didn't even register on the stick! It has an oil leak too though. So far I have put 380 miles on it, and the oil still reads full. That is a slow enough rate that I could easily afford ot feed it oil if it need be for some time.

ANd another thing...How in the heck do you over fuel?

Don't forget to check the intake manifold sealing and piping for leakages. especially after the airmass meter. This can cause a light blueish smoke. The blownby air will mess with the meter zo ecu reads a letries to compensate (within a margin).
check ur sparkies when they have goo on them and are greasy, Oil.
Like PV said check ur oxy also.

white smoke indicates burned engine coolant . Try putting a glass on the exhaustpipe for a few minutes (works for me all the time), Oil leaves a greasy black layer on the inside, water a brownish goo.
You mentioned that it uses oil so my GUESS is that it's most likely an oilscraper ring thats faulty even if compression turns out to be ok.' search and you will find..

Cheers

elgordomuygrande wrote:Don't forget to check the intake manifold sealing and piping for leakages. especially after the airmass meter.

Feroza's / US Rockys have a MAP sensor, which can compensate for this.

You really need to establish if it's burning oil or not- then go from there. From what I thought- bluish smoke was burning oil; black is over fueling.

Over fueling could be caused by any number of things- eg. EFI sensor faults or fuel pressure regulator probs.

You're right, got the colors mixed up

I meant black smoke

tufferoza wrote:i get smoke when i rev hard, blue/grey though and yes it does use a little oil. i'll put a rebuild kit through it oneday. haha

Don't go doing things like that... it took me a lot of hours with Ferocious on the red line to get just the right amount of smoke out the back.... besides, it makes it look like it's going faster...

ShinyDiscoBalls wrote:

tufferoza wrote:i get smoke when i rev hard, blue/grey though and yes it does use a little oil. i'll put a rebuild kit through it oneday. haha

Don't go doing things like that... it took me a lot of hours with Ferocious on the red line to get just the right amount of smoke out the back.... besides, it makes it look like it's going faster...

hahahaaa.. and it still see's redline often too.

i cant wait for boost though, give it a real workout.