 | Home > Technical > Puma EGR valve contamination. |
 
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| bell-auto-services Member Since: 08 Jul 2007 Location: North Yorkshire Posts: 2232   
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Since im on the mission of sorting out all the puma glitches/issues they have in their various form of modification or not and plan to share the info for all to read, my work has led me back again to the EGR valve for a deeper look.
Ive taken this EGR valve from a car that had only 12k on the clock, it was a untouched, un modifyed, un tuned car that had driveability isssues namley very slight "flat spots" on accelleration. Now im not saying that all cars will be the same, and im well aware that landrover have since updated the EGR valves to address what i beleive is this same issue but some of your cars may have this problem unlerlined in the car. The car had the normal type of faults EGR, turbo underboost , turbo over boost etc etc which really meant nothing as a fault goes. So me being me and as I wanted to get to the bottom it I started stripping various parts from the car making tests and investigations which is how i found this. The first picture is of the valve gears, NOTE ive taken the middle ideler gear out on this picture, but more to the point note the "soot" in the valve body contaminating the internals.  Click image to enlarge The next picture is if the middle gear that i took out, you can see how much soot is on it where ive had my finder and its wiped off. Click image to enlarge The next picture os of the casing top/ lid of the EGR valve wheir the connector goes, again note the soot build up inside. Click image to enlarge And a close up of the contacts that connect to the motor terminals that feed it power. Click image to enlarge Here is the motor terminals them selfs, also contaminated. Click image to enlarge This soot is all inside the motor windings, on its contacts, clogging the gears etc etc how LandRover expected this thing to be reliable ill never know. The Valve mechanism its self seems to work with the exception of it does not fully return closed under its own steam of which it seems to want to do with itsspring loaded action, it seems a bit catchy , i assume from the soot contamination. So its looking like even though the motor is commanded by the ecu it may not do what its supposed to because of all the crap inside. Tomorrow ill strip it further and clean it out to see if i can make it work correctly again by just cleaning it. Pete |
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22nd Feb 2011 12:28am |
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| dgardel Member Since: 30 Nov 2008 Location: Veneto (Heart & Head) Posts: 3586 
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mhmm interesting.....
by the way, Pete, I'm at home now...... Discovery 5 td6 HSE Stornoway Gray Outback Engineering Limited Edition
IID Pro MV License |
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22nd Feb 2011 12:53am |
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.| o4dn Member Since: 08 Jan 2010 Location: South West Posts: 530  
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Thanks a lot for sharing
My car has that kind of symptoms as well and I've reported that to LR months ago, multiple times. Problem is, no matter what, LR denies the problem and will not replace the EGR unless it breaks down 
EDIT: Things seem to have improved a lot in the past few months, actually, either I got used to it or it's no more as serious as it used to be...  |
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22nd Feb 2011 9:04am |
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| Bomber82 Member Since: 20 Oct 2009 Location: Alessandria - Italy Posts: 216 
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Thanks Pete!
I'm having a lot of problem with EGR and MAF in this period, I still don't know if everithing is depending only to EGR or both... Tomorrow I'll go to my dealer for solve this problem, we see what they do. In case they will change something, I'll ask them if they can leave me the broken one (but I don't think so because of warranty...) in order to have a look inside, my 110 has done 54.000 up to now. Matteo Defender 110 Td4 SE MY 09 |
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22nd Feb 2011 9:30am |
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| The Boy Member Since: 28 Aug 2008 Location: East Northants Posts: 1459 
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So is doing what you have done i.e.; removing, taking apart, cleaning and reassemble of the egr a task we can do ourselves at home without fear of
 it up?
Boy |
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22nd Feb 2011 9:53am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2591  
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whoever invented the EGR should be skinned alive.
Is there anyway to prevent this kind of soot buildup in the EGR? How do we explain that it only happens on some Pumas and not others - mine is on 15000km and never had any flat spot issues? -- 2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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22nd Feb 2011 10:14am |
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| --defender-- Member Since: 22 Apr 2010 Location: South Coast Posts: 90 
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I suspect driving style, distance of journeys, fuel grade, exterior & engine temeperature all have a bearing on soot build-up? From what Pete has shown in the kindly shared information, you can tell the motor is a standard DC motor, not a stepper. So the ECU can only set the EGR by using a length-of-time drive as their is no reference feedback? If it ain't broke don't fix it! |
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22nd Feb 2011 2:34pm |
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| Pumice Member Since: 22 Sep 2009 Location: Australia Posts: 2  
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X 2. |
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22nd Feb 2011 11:47pm |
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| noworries4x4 Member Since: 24 Dec 2010 Location: Newton Abbot Devon Posts: 1195 
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Forgive me for being stupid i thought that is why the Transit and Land Rover do the sill noise when turned off, i understood that was a egr clearing cleaning thing ????? If everything is under control you are not going fast enough.
Every Day 16 MY Discovery 4 Commercial Workshop and Escort Vehicle Weekends 07MY L322 TDV8 Vogue SE Series 1 80" 3ltr 6cyl with overdrive No Worries 4X4 |
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22nd Feb 2011 11:56pm |
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| mse Member Since: 06 Apr 2008 Location: UK Posts: 5024 
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Yes but i think its a different part...the actual valve Mike |
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23rd Feb 2011 12:30am |
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| blackwolf Member Since: 03 Nov 2009 Location: South West England Posts: 16883 
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I think that the noise is simply the EGR valve being driven through a full movement cylce about three times in succession to try to prevent it seizing up. If it was well designed it would (a) be silent, and (b) not need to do this.
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23rd Feb 2011 11:41am |
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| Naks Member Since: 27 Jan 2009 Location: Stellenbosch, ZA Posts: 2591
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Do u guys also get a beeep afterwards?  --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear 2015 Range Rover Sport V8 Supercharged
Defender Puma Workshop Manual: https://bit.ly/2zZ1en9 Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ |
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23rd Feb 2011 12:00pm |
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| mick Member Since: 08 Feb 2010 Location: Yorkshire Posts: 2109 
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No beep just a rattle type noise
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23rd Feb 2011 12:32pm |
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| --defender-- Member Since: 22 Apr 2010 Location: South Coast Posts: 90
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That's the sound of the gears grinding as the motor drives the gearbox to the end-stop! If it ain't broke don't fix it! |
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23rd Feb 2011 2:25pm |
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