Black smoke on acceleration.
Posted: 11 Apr 2026, 19:10
Hi all, thanks for any help in advance.
So 1.9TD Aaz vanny. Replaced head gasket, valve stem seals, injector nozzles (pop tested to within 5bar or each other and 150 bar set) general clean up of everything.
Now after rebuilding the van smokes a bit of black smoke on throttle (constantly when accelerating, nothing on idle or run down)
I’ve started at 0.92mm injection timing. Just gone up to 1mm on the DTI injection timing and still the same.
Any suggestions on where I start?
Further advancing the injection timing?
Anything injector I should be looking at?
Power feels maybe lower than it did before but not massively dis similar (it’s been 4 months in the making so I wonder if this is just getting back into it after winter break!)
Should I have to adjust my fuel screw with new nozzles? They were genuine Bosch ones so I didn’t go cheap!
Stuck abit really, feel like I’m chasing this around. Already pulled injectors out and checked the flame traps were sealing twice.
Any help, much appreciated!
Thanks
So 1.9TD Aaz vanny. Replaced head gasket, valve stem seals, injector nozzles (pop tested to within 5bar or each other and 150 bar set) general clean up of everything.
Now after rebuilding the van smokes a bit of black smoke on throttle (constantly when accelerating, nothing on idle or run down)
I’ve started at 0.92mm injection timing. Just gone up to 1mm on the DTI injection timing and still the same.
Any suggestions on where I start?
Further advancing the injection timing?
Anything injector I should be looking at?
Power feels maybe lower than it did before but not massively dis similar (it’s been 4 months in the making so I wonder if this is just getting back into it after winter break!)
Should I have to adjust my fuel screw with new nozzles? They were genuine Bosch ones so I didn’t go cheap!
Stuck abit really, feel like I’m chasing this around. Already pulled injectors out and checked the flame traps were sealing twice.
Any help, much appreciated!
Thanks