Engine 850: B5234TR/2.3/20v/T5R: - soot over boot

TheG · May 11th, 2007, 23:19

After running it along the motorway, a thin layer of slightly oily soot appears on the boot lid. I've changed leads, dissy cap, rotor arm and air filter. Engine light isn't on (haven't checked for any codes but assume there aren't any?).

Worth trying a new MAF and some new plugs you think?

Ta

Conehead · May 11th, 2007, 23:26

For the price of a MAF I'd keep an eye on oil levels and take it for a run on another day after cleaning it, but doubt it would be that any way.
Take it you have an estate? as it would seem to me you have a reasonable leak, look under the car all the way

TheG · May 11th, 2007, 23:29

yes, under the car there is oil running back, but it looks old, not fresh. I was thinking MAF because does soot not mean its running rich? I have a spare MAF so I suppose I've got nothing to lose. The one on the car looks brand new though!

bigandquick · May 12th, 2007, 08:23

Might this not be connected to your other post re the smoking/leaking turbo?
You say the 'soot' is oily.

TheG · May 12th, 2007, 09:42

not a clue!

It might very well be connected, but isn't if it was just oil spewing out, there wouldn't be soot would there?

bigandquick · May 12th, 2007, 10:08

I'm assuming the smoke you talked of was burning oil? And as you drive along the smoke would travel front to rear. I'd have money on that being the cause

TheG · May 12th, 2007, 11:00

yeah, the smoke was definately burning oil. There's also now burnt smelling oil on the drive.

Jod T5 · May 15th, 2007, 12:27

Quote:

Originally Posted by TheG

yes, under the car there is oil running back, but it looks old, not fresh. I was thinking MAF because does soot not mean its running rich? I have a spare MAF so I suppose I've got nothing to lose. The one on the car looks brand new though!

is the oil coming out of the zoorst or getting blown back under the car?...
check the condition of the plugs, if they are black oily or sooty this would indicate rich running...
how is your temprature gauge behaving?....
cheers
jod

TheG · May 15th, 2007, 15:31

I don't know tbh. There is fresh oil under the car now and it now drops oil when parked up after a run.

Temp guage is rock solid in the middle and gets there nice and quickly. Haven't checked the plugs yet actually.

Jod T5 · May 15th, 2007, 15:47

Quote:

Originally Posted by TheG

I don't know tbh. There is fresh oil under the car now and it now drops oil when parked up after a run.

Temp guage is rock solid in the middle and gets there nice and quickly. Haven't checked the plugs yet actually.

in my experience tom you can judge where the leak is coming from simply by looking from the front where the drips are...centrally would be return pipe or sump plug gasket or to the right as you look (nearside as you sit) rear main seal leak....
if the temp is good i would not expect you to be tunning in cold cycle mode so it may well be the maf although i would have expected the exhaust sensor to be able to adjust the fueling, and the maf should throw a light.....
cheers
jod

May 11th, 2007, 23:19	#1
TheG growl, woosh! Last Online: Feb 5th, 2018 15:46 Join Date: Oct 2006 Location: London View Photos By: TheG	soot over boot After running it along the motorway, a thin layer of slightly oily soot appears on the boot lid. I've changed leads, dissy cap, rotor arm and air filter. Engine light isn't on (haven't checked for any codes but assume there aren't any?). Worth trying a new MAF and some new plugs you think? Ta __________________ Tom

May 11th, 2007, 23:26	#2
Conehead Senior Member Last Online: Feb 18th, 2011 10:28 Join Date: Jan 2006 Location: dartford	For the price of a MAF I'd keep an eye on oil levels and take it for a run on another day after cleaning it, but doubt it would be that any way. Take it you have an estate? as it would seem to me you have a reasonable leak, look under the car all the way __________________ Ex C70 T5

May 11th, 2007, 23:29	#3
TheG growl, woosh! Last Online: Feb 5th, 2018 15:46 Join Date: Oct 2006 Location: London View Photos By: TheG	yes, under the car there is oil running back, but it looks old, not fresh. I was thinking MAF because does soot not mean its running rich? I have a spare MAF so I suppose I've got nothing to lose. The one on the car looks brand new though! __________________ Tom

May 12th, 2007, 08:23	#4
bigandquick Premier Member Last Online: May 15th, 2024 14:37 Join Date: Dec 2003 Location: Cambridge	Might this not be connected to your other post re the smoking/leaking turbo? You say the 'soot' is oily. __________________ Tim '16 XC60 SE Lux Nav Last edited by bigandquick; May 12th, 2007 at 08:25.

May 12th, 2007, 09:42	#5
TheG growl, woosh! Last Online: Feb 5th, 2018 15:46 Join Date: Oct 2006 Location: London View Photos By: TheG	not a clue! It might very well be connected, but isn't if it was just oil spewing out, there wouldn't be soot would there? __________________ Tom

May 12th, 2007, 10:08	#6
bigandquick Premier Member Last Online: May 15th, 2024 14:37 Join Date: Dec 2003 Location: Cambridge	I'm assuming the smoke you talked of was burning oil? And as you drive along the smoke would travel front to rear. I'd have money on that being the cause __________________ Tim '16 XC60 SE Lux Nav

May 12th, 2007, 11:00	#7
TheG growl, woosh! Last Online: Feb 5th, 2018 15:46 Join Date: Oct 2006 Location: London View Photos By: TheG	yeah, the smoke was definately burning oil. There's also now burnt smelling oil on the drive. __________________ Tom

May 15th, 2007, 15:31	#9
TheG growl, woosh! Last Online: Feb 5th, 2018 15:46 Join Date: Oct 2006 Location: London View Photos By: TheG	I don't know tbh. There is fresh oil under the car now and it now drops oil when parked up after a run. Temp guage is rock solid in the middle and gets there nice and quickly. Haven't checked the plugs yet actually. __________________ Tom

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