Not true I'm afraid. When the egr sticks open, too much exhaust gets into the inlet which is oxygen starved. The ecu doesn't know this as it has assumed the egr to be closed. It fuels accordingly and the result is plenty of smoke from unburnt fuel. An O2 sensor cannot compensate for this amount of over fuelling.
Technical egr blanking off
- Thread starter shotgun
- Start date
Currently reading:
Technical egr blanking off
Not true I'm afraid. When the egr sticks open, too much exhaust gets into the inlet which is oxygen starved. The ecu doesn't know this as it has assumed the egr to be closed. It fuels accordingly and the result is plenty of smoke from unburnt fuel. An O2 sensor cannot compensate for this amount of over fuelling.
When you had the remap done, it is normal for the mapper to increase fuelling for better throttle response. This will slightly overfuel which will cause some smoke but only for a small time. It will settle quickly as boost comes on. Nothing to worry about.
- Joined
- Dec 18, 2010
- Messages
- 155
- Points
- 37
hi all just fitted the tafmet yesterday but not the blanking plate weather to cold at moment fine weather D.I.Y'ER these days . starts & runs O.K. with no engine light on non before either going on a trip Wednesday so will know for deff then
tidewatcher
Member
Just found this thread, started a new one as my 1999 1.9td has an EGR problem. My question is if I blank it off does this make any difference to the turbo temperature and MoT emission test? It is a tricky one to get at and really do not want to risk the problem returning but only if it does no harm to blank it.
tidewatcher
Member
Definitely, set under the inlet manifold area to the right of the engine as you look at it.
The MOT emissions test for diesels only measures smoke, not the NOx EGR reduces. However it is illegal to to remove or defeat originally fitted emissions control equipment and the MOT tester is supposed to check for this. At the moment this is a visual check only so may not pick up a blanking plate.
Roert G8RPI.
tidewatcher
Member
As it has taken from 1999 until now to become a problem then cleaning thoroughly should see the van out.......... Safest option.
Might be "safest" but may not work. They do wear out and stick even after cleaning. Best to blank off. Your engine will thank you.
Last edited:
- Joined
- Dec 18, 2010
- Messages
- 155
- Points
- 37
hi all mine has just passed the M.O.T & this guy is keen plus trust my look the guy who does the 6 month check on the emissions equipment for the government happened to be there i nearly had to change my shorts anyway all was fine
- Joined
- Dec 18, 2010
- Messages
- 155
- Points
- 37
hi techno like i said this guy is keen he always lift's the bonnet on all my motors i have taken there
A MOT requirement to check for presence of emissions control equipment specifically DPFs, came in January 2014. There is nothing specific for EGR in the MOT, but they are suppsed to fial the car if emissions control equipment is obviously missing. Deletion of it has been illegal in the UK (and EU) for longer than that. Detection of an EGR delete at MOT is unlikely as the emissions test does not include NOx and there is not even any guidace in the testers handbook on checking for DPF or catalyst deletion. This is likely to change see
http://garagewire.co.uk/news/government-investigates-dpf-removal-ahead-of-crackdown/
This my also catch degraded DPFs.
EGR deletion is more likely to be picked up after an accident or insurance claim as the insurers (and police if it was serious accident) are likely to look at the car more closely. Reading ECUs is becoming common by insurance investigtors as they can often determine speed etc.
Robert G8RPI.
I'd be very worried if the tester did not lift the bonnet on my car. Apart from anything else they are supposed to check the oil level before the emissions test.
Robert G8RPI.
Techno100
Member
- Joined
- May 10, 2013
- Messages
- 252
- Points
- 68
Sorry but you are just making stuff up. You show me in the testers manual where oil level is to be tested? that is rubbish.
The engine has to be fully warmed up (oil up to temperature) for emission test end of.
It states there must be sufficient oil in the engine, this can be ascertained from the instrument cluster along with engine temperature
Last edited:
You just said it yourself "there must be sufficent oil" You cannot tell the oil level from the instruments of most cars (I have had Renaults with an oil level indication but it's the exception). The oil pressure warning light is certainly no use for checking the level. They are not allowed to use the car's temperature gauge it's coolant not oil for starters, unless the oil is not measurable through the dipstick e.g. dry sump engine.
There are number of reasons for lifting the bonnet, from testers manual:
" 2 c
The vehicle is not fit to be driven when necessary to complete the test because of a lack of fuel, or oil, or for any other reason.
7.4
The smoke test must only be completed when: there is sufficient oil in the engine
7.4
Ensure the engine is at least 80 °C or normal operating temperature if lower, before carrying out an instrumented smoke test. This should be achieved by use of an engine oil temperature probe or other approved device. "
Note thaat they have to use a oil temperature probe in the dipstick hole, even if the tester did not check the level, they still have to pull the dipstick.
Robert G8RPI.
Last edited:
Sorry, but you are the one making things up. It's been iilegal since at least the 1986 Construction and use regulations, 61. (6).
"No person shall use, or cause or permit to be used, on a road a motor vehicle to which item 3 of the Table applies unless it is so maintained that the means specified in column 3 of that item are in good working order. "
Robert G8RPi.