Can't get rid of grey smoke

Hi all, after some assistance with my 2.8l Hilux diesel. It has been blowing large amounts of dark grey smoke whenever it is under load (changing gears, climbing hills etc). There is also some small amounts of smoke at times at idle but not all the time. I have just replaced the injectors (hi-flo injectors), fuel filter and air filter but there is no improvement.

The smoke had been there for a year or so before the injectors were replaced. The end of the old injectors was covered in black soot.

SO... Is there another cause for the smoke, is there something else that needs adjusting/replacing, does the engine need flushing to remove the soot that is probably still in there????

The only other thing the mighty gregory's manual suggests is incorrect pump timing so if this is the consensus here then is there a recommended shop to take it to (apart from West End Diesel - haven't had good experiences there)

Thanks heaps...
Back Expand Un-Read 0 Moderator

Reply By: Andrew-rodeo - Tuesday, Jan 19, 2010 at 19:57

Tuesday, Jan 19, 2010 at 19:57
Hi there Michael, is it grey smoke which could possibly be oil burning? Or is it a black smoke which would be a rich fuel mixture.
Cheers Andrew
AnswerID: 400225

Follow Up By: mikeyandmary - Tuesday, Jan 19, 2010 at 20:02

Tuesday, Jan 19, 2010 at 20:02
It looks more black than grey...
FollowupID: 669351

Reply By: Member - Shane D (QLD) - Tuesday, Jan 19, 2010 at 20:07

Tuesday, Jan 19, 2010 at 20:07
Hi Michael,
I agree with the Gregory's manual, black smoke indicates half burnt deisel, white-ish gey smoke usually means quarter burnt deisel,
I'm thinking its over fuelling to buggery or a feul timing issue.

AnswerID: 400226

Reply By: Member - Axle - Tuesday, Jan 19, 2010 at 20:27

Tuesday, Jan 19, 2010 at 20:27
G/Day Michael, If it was me i think i would get a comppresion test done before spending to much!, ,, Low comppresion can cause an array of different symptons, and if the case, puts a whole dfferent light on the , "What to do now", Equation

Cheers Axle
AnswerID: 400231

Reply By: nomadoz - Tuesday, Jan 19, 2010 at 20:54

Tuesday, Jan 19, 2010 at 20:54
Use to have Toyota 2.8 diesel, it appears to be the norm, nothing to worry, just slightly over fuelled

Lifetime Member
My Profile  Send Message

AnswerID: 400240

Reply By: Member - Tour Boy ( Bundy QLD) - Wednesday, Jan 20, 2010 at 08:59

Wednesday, Jan 20, 2010 at 08:59
The timing on the 2.8 was set retarded from the factory, advance it a little and you'll see an improvement in smoke and horsepower (if you call it that)

2010 Isuzu FTS800 Expedition camper
2015 Fortuner
Had 72 cruisers in my time

Lifetime Member
My Profile  My Blog  Send Message

AnswerID: 400290

Reply By: trainslux - Wednesday, Jan 20, 2010 at 11:14

Wednesday, Jan 20, 2010 at 11:14
Has the max fuel, and throttle stop been adjusted, or moved ?.
They are sealed with wire, so as to not adjust them.

Do you have a snorkel?? reason for asking, is that the standard intake is behind the lh front headlight, and its pretty restricted, not uncommon to get something caught/ blocked in there.
Is the air filter ok, is the inlet tube from filter to intake manifold collapsing on itself?

If its black, its over fuelling, if its grey, its either low comp, or water related, or are you running any additives in the fuel?

Have you drained the water from the tank, and filter housing to see if any is there?

Let us know.


Most often the reason for overfueling is that the max fuel screw, one near the idle stop solenoid in the top part of the injector pump housing above the 4 fuel pipe outlets is wound in, to give more peformance, 1/3 of a turn is alot of extra fuel, and often someone has wound these in, which results in alot more black smoke, and little performance gain.

AnswerID: 400306

Reply By: TerraFirma - Wednesday, Jan 20, 2010 at 13:20

Wednesday, Jan 20, 2010 at 13:20
Rankin Diesel in Bayswater are very good, leave to the experts to analyse. You may also want to try some FTC Decarboniser but speak to Rankin first.
AnswerID: 400326

Follow Up By: pdm3006 - Wednesday, Jan 20, 2010 at 17:13

Wednesday, Jan 20, 2010 at 17:13
FTC Decarboniser (From CEM) is great stuff but will only remove hard carbon deposits from the inside of the cylinders and exhaust. I doubt it would fix a smoke issue.
CEM Cleanpower may help, not sure there.
I agree the issue is likely over-fuelling or retarded injection timing.
FollowupID: 669487

Reply By: howesy - Wednesday, Jan 20, 2010 at 20:03

Wednesday, Jan 20, 2010 at 20:03
Dont know where you are but if your around sydney west suburbs I found nepean diesel to be pretty good when I had my 2.8
AnswerID: 400368

Reply By: Madfisher - Wednesday, Jan 20, 2010 at 20:37

Wednesday, Jan 20, 2010 at 20:37
Back when most of my mates had 2.8 luxs, we found that at higher atitudes they always blew more smoke. Secondly they all blow smoke, but if you fit a snorkle and extractors and free flowing exhaust, it cuts down smoke and helps performance and economy.
Cheers Pete
AnswerID: 400372

Sponsored Links

Popular Products (14)