Smoking under acceleration,Any ideas?

carl325 · Jun 1st, 2009, 22:17

My V40 D 2002 smokes under acceleration in the lower gears,big clouds of black smoke,car has been well serviced as a BT fleet car and has a mileage of 97k so not mega miles.Just wondering if this could be a clogged EGR or maybe a turbo issue?
Any ideas guys?

lpg224kw · Jun 6th, 2009, 00:45

I understand black smoke to be down to poor combustion, too much fuel not enough air or poorly atomised fuel injection. i.e. i would expect the problem to be with either the fuel injectors or the sensors and controls that set the injector pressure, timing and duration, or possibly a faulty MAF sensor over-predicting the mass air flow. (assuming your engine is commen rail injection like my D5, if not oops!!)

I be surprised if it were the turbo. faults with turbos and smoke are generally lubrication getting into the inlet or exhaust and causing blue smoke like a badly worn piston/bore

I'd be interested to know what diagnostic tests are possible for the injectors. Can an injector be passed as good or identified as bad by the ECU/ECM. (I may have an injector problem)

can't comment on EGR, no idea.

S60-MBS · Jun 8th, 2009, 20:21

black smoke could also be lack of air

grass hopper · Jun 8th, 2009, 22:28

Quote:

Originally Posted by carl325

My V40 D 2002 smokes under acceleration in the lower gears,big clouds of black smoke,car has been well serviced as a BT fleet car and has a mileage of 97k so not mega miles.Just wondering if this could be a clogged EGR or maybe a turbo issue?
Any ideas guys?

the turbo hoses are known to split,this will give a slight loss in power and slight hiss on full load.i would check the air filter as well.

dinger · Jul 12th, 2009, 19:13

My D5 became extremely smokey unbder acceleration a few days after I bought it (2nd hand with 40K on the clock). There was no significant affect on performance, but it could be that I was not yet sufficiently accustomed to what was normal. Anyway, it was diagnosed as a "burst" intercooler. Replacement was, thankfully, a warranty job as I believe it could have been very costly.

Georgey dee · Jul 15th, 2009, 20:27

Black smoke usually = Inlet leak

MRDART · Jul 17th, 2009, 21:54

I would check
1 airfilter+ airbox
2 plumbing from turbo to intercooler to intake manifold for leaks. My friends passat tdi started to smoke like a freight train and it was a pipe from the intercooler that was chafed through...

After checking those bits that it gets more advanced....

Best regards / The swede

Jun 1st, 2009, 22:17	#1
carl325 New Member Last Online: Jun 23rd, 2009 11:13 Join Date: Apr 2009 Location: essex	Smoking under acceleration,Any ideas? My V40 D 2002 smokes under acceleration in the lower gears,big clouds of black smoke,car has been well serviced as a BT fleet car and has a mileage of 97k so not mega miles.Just wondering if this could be a clogged EGR or maybe a turbo issue? Any ideas guys?

Jun 6th, 2009, 00:45	#2
lpg224kw New Member Last Online: Jun 24th, 2011 18:40 Join Date: Feb 2008 Location: Manchester	I understand black smoke to be down to poor combustion, too much fuel not enough air or poorly atomised fuel injection. i.e. i would expect the problem to be with either the fuel injectors or the sensors and controls that set the injector pressure, timing and duration, or possibly a faulty MAF sensor over-predicting the mass air flow. (assuming your engine is commen rail injection like my D5, if not oops!!) I be surprised if it were the turbo. faults with turbos and smoke are generally lubrication getting into the inlet or exhaust and causing blue smoke like a badly worn piston/bore I'd be interested to know what diagnostic tests are possible for the injectors. Can an injector be passed as good or identified as bad by the ECU/ECM. (I may have an injector problem) can't comment on EGR, no idea. Last edited by lpg224kw; Jun 6th, 2009 at 00:48.

Jun 8th, 2009, 20:21	#3
S60-MBS VOC Member Last Online: Jun 7th, 2020 11:28 Join Date: Jan 2006 Location: ???????????????? View Photos By: S60-MBS	black smoke could also be lack of air __________________

Jul 12th, 2009, 19:13	#5
dinger New Member Last Online: Jan 2nd, 2010 20:29 Join Date: Nov 2008 Location: St Ives	Smokin' My D5 became extremely smokey unbder acceleration a few days after I bought it (2nd hand with 40K on the clock). There was no significant affect on performance, but it could be that I was not yet sufficiently accustomed to what was normal. Anyway, it was diagnosed as a "burst" intercooler. Replacement was, thankfully, a warranty job as I believe it could have been very costly.

Jul 15th, 2009, 20:27	#6
Georgey dee Premier Member Last Online: Feb 14th, 2024 18:36 Join Date: Dec 2005 Location: Norwich View Photos By: Georgey dee	Black smoke usually = Inlet leak __________________ HAD; 440 GLT(Loved it), 850 GLT auto(Loved it), S70 2.5T(Nothing but problems!), 850R auto(Loved it!!), S60 D5 SE (Nothing but problems!) GOT; S60 D5 SE Lux Auto RAF Marham Track Day Co-Ord'

Jul 17th, 2009, 21:54	#7
MRDART Junior Member Last Online: Jan 19th, 2010 08:40 Join Date: May 2009 Location: Tomelilla	I would check 1 airfilter+ airbox 2 plumbing from turbo to intercooler to intake manifold for leaks. My friends passat tdi started to smoke like a freight train and it was a pipe from the intercooler that was chafed through... After checking those bits that it gets more advanced.... Best regards / The swede

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