Member Since: 09 Nov 2017
Location: Telford
Posts: 76
Confused about egr blanking
Okay, so over Christmas I had the EML come on and diagnosed as P-0405 EGR. I had a chap out and had the vehicle remapped and EGR's blanked but still had the EML and fault. So, the next thing I did was physically blank the EGR's and clear the faults. Fast forward two months and the EML and codes have come back. I took the vehicle to Roeans in Telford (where service with a smile is extra) and they read the fault and suggested I let the guy that did the blanking map know about it. When I phoned him he told me that because the EGR was already stuck open it keeps sending faults, and that I will have to change the EGR anyway. Is that right?
12th Mar 2020 11:37 am
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4657
No, there should have been a software patch to prevent the EML coming on, even though the fault codes will still re-occur.
If you do a search on here there is a lot posted on the subject.yµ (idµ - eAµ) ψ=mψ
12th Mar 2020 12:03 pm
Telfordsteve
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
Thanks for the quick reply. I get and clear the faults daily, I thought the map should stop them appearing. I'm a bit worried about taking it for the MOT and failing. Should I contact the mapping people again and tell them they need to come back?
12th Mar 2020 12:13 pm
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
Because you did not physically blank the EGRs but did it electronically, the EGRs are locked open and gases still going into your engine as there is no physical barrier and this is being detected by the ECU.
My guess is that if you put in physical blanks as well your problem will go away.
12th Mar 2020 12:48 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4657
Remapping is generally an enhancement for performance, fuel economy, or both. It would appear that a patch has not been deployed to deal with your EML. You will possibly be OK for the MOT if you can clear the faults just prior to presenting the car for test. (clear them outside the centre!!) It can take up to 4 or more cycles of the ign for the PCM to flag the EML again. So you should be OK if the tester is not prone to starting and stopping the engine repeatedly
Although on occasion the EML can come on after only 2 ign cycles, it really depends on the faults but you can trial it yourself before presenting the car!!yµ (idµ - eAµ) ψ=mψ
12th Mar 2020 12:54 pm
Telfordsteve
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
garrycol wrote:
Because you did not physically blank the EGRs but did it electronically, the EGRs are locked open and gases still going into your engine as there is no physical barrier and this is being detected by the ECU.
My guess is that if you put in physical blanks as well your problem will go away.
I have blanking plates and butterfly removed, the problem is that the guy that did the patch is saying that because one of them was already stuck open it's still showing a fault.
12th Mar 2020 1:07 pm
Telfordsteve
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
PROFSR G wrote:
Remapping is generally an enhancement for performance, fuel economy, or both. It would appear that a patch has not been deployed to deal with your EML. You will possibly be OK for the MOT if you can clear the faults just prior to presenting the car for test. (clear them outside the centre!!) It can take up to 4 or more cycles of the ign for the PCM to flag the EML again. So you should be OK if the tester is not prone to starting and stopping the engine repeatedly
Although on occasion the EML can come on after only 2 ign cycles, it really depends on the faults but you can trial it yourself before presenting the car!!
My fault, I got the jargon wrong. I had a remap and patch done at the same time.
12th Mar 2020 1:08 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Even with an EGR delete software patch, the EGR's need to work. Although the engine ECU will not demand EGR, because they are permanently set to zero, they must work so as not to throw the code up.
I've read on threads about people who have fitted new EGR's and had them mapped out at the same time.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
12th Mar 2020 1:11 pm
Telfordsteve
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
This is what I was getting at before I go moaning to the guy that put the patch on. My fault code was for sensor A which I guess is the NS EGR.
12th Mar 2020 1:21 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20731
Nonsense. All it is, is a software patch to prevent the light coming on when that code is logged in the PCM
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
Thank you DM, that's all I needed to know.
12th Mar 2020 2:15 pm
garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1115
Telfordsteve wrote:
garrycol wrote:
Because you did not physically blank the EGRs but did it electronically, the EGRs are locked open and gases still going into your engine as there is no physical barrier and this is being detected by the ECU.
My guess is that if you put in physical blanks as well your problem will go away.
I have blanking plates and butterfly removed, the problem is that the guy that did the patch is saying that because one of them was already stuck open it's still showing a fault.
Ok - sorry misunderstood I thought you just had done the patch.
If you are still getting the EML on after physically blanking and getting the EGR delete patch done then there should be no EML - I am with Disco Mickey - the patch was not done correctly - did the Mech actually just do a remap and not include the EGR delete patch?
13th Mar 2020 2:48 am
Telfordsteve
Member Since: 09 Nov 2017
Location: Telford
Posts: 76
He did both at the same time, I had no EML for two months then the light came on.
13th Mar 2020 10:29 am
urhunden
Member Since: 15 Jan 2010
Location: Stockholm
Posts: 773
Have blanked my D3 MY2008 with DPF. Got EGR delete patch and dpf patch from Bells.
Despite this I had EML light on and an error message about EGR valve.
Changed one GR and now it is OK without EML.
Apprently a stuck EGR gives EML light on evn if it is blanked and patched.
13th Mar 2020 4:46 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4657
It shouldn't, that's the point of adding the patch.yµ (idµ - eAµ) ψ=mψ
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