Robertybob Posted February 2, 2009 Share Posted February 2, 2009 Can anyone help? I have a 3.9 RR that has faile the MOT on the Lamda test only. The exhaust has been changed some time in its life to a normal non cat no sensors. The resitor has been changed to 470 ohm on the engine ECU under the driver seat. The readings are as follows fast idle test CO 0.163 Pass HC 71 Pass Lambda 1.186 Fail Second fast Idle CO 0.164 Pass HC 40 Pass Lambda 1.174 Fail Natural Idle CO 0.499 Pass I don't know how important it is but the test set up was for a Landrover Freelander 3.497cc I have not been able to find the Lambda values all hoses are OK and the exhaust Quote Link to comment Share on other sites More sharing options...
Ally V8 Posted February 3, 2009 Share Posted February 3, 2009 If you are confident there are absolutely no air leaks then all you can do is richen it up a bit via the adjuster on the air flow meter.The Lambda reading of more than 1 is lean,less than 1 is rich - 1 is stoich,14.7 / 1 air to fuel by mass. Quote Link to comment Share on other sites More sharing options...
Highway_Star Posted February 4, 2009 Share Posted February 4, 2009 "I don't know how important it is but the test set up was for a Landrover Freelander 3.497cc" Very I would say! What year is your Range Rover? Unless it's got cats, and BTW there is not a Range Rover Classic made that MUST have cats for MOT purposes, the Lambda reading shouldn't be part of the test AFAIK. My own 1990 3.9 RRC is only tested on CO and HC content, it would pass the cat test comfortably but doesn't have to. Here's a link to the relevant griff. http://www.motuk.co.uk/manual_730.htm Quote Link to comment Share on other sites More sharing options...
paintman Posted February 4, 2009 Share Posted February 4, 2009 You will find the VoSA appeals number on the link. Suggest you ring them & ask whether the test is correct. What has the garage that did the test said? Quote Link to comment Share on other sites More sharing options...
Robertybob Posted February 4, 2009 Author Share Posted February 4, 2009 "I don't know how important it is but the test set up was for a Landrover Freelander 3.497cc"Very I would say! What year is your Range Rover? Unless it's got cats, and BTW there is not a Range Rover Classic made that MUST have cats for MOT purposes, the Lambda reading shouldn't be part of the test AFAIK. My own 1990 3.9 RRC is only tested on CO and HC content, it would pass the cat test comfortably but doesn't have to. Here's a link to the relevant griff. http://www.motuk.co.uk/manual_730.htm My RRC was reged on 1st Aug 1992. all cars should be fitted with cats andoxygen sensors after this date. However I will be adjusting the mixture this weekend and see if I can get the Lambda down to 1 or a bit below this will bring up the CO2 and the HC. I will adjust the mixture using the Co2 analyser so as not to go too far. I understand that if the vehicle is not fitted with Cats then it should be teated as a vehicle without cats and the Lambda test becomes N/A I will let you all know Quote Link to comment Share on other sites More sharing options...
woodytz Posted February 4, 2009 Share Posted February 4, 2009 ANY vehicle manufactured post 1993 {K reg}will be tested as a cat vehicle and subject to the relevent emmissions criteria. A lot of manufacturers used cats and closed loop fuel management before 1992 cheers woody Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted February 4, 2009 Share Posted February 4, 2009 Are you sure it's set up for a Land Rover Freelander 3.5 petrol, because they never actually made one of those often MOT testers will type the wrong thing into the computer (I had my 109 MOT'd as an "SUV" and a "Green 90" before now ) but if he's selected Freelander then they all had cats which knock the emissions down to a level you just won't pass with a non-cat car. I'd take it back, check what he's done and suggest he re-tests it properly and for free in exchange for not being reported to VOSA for being a muppet Quote Link to comment Share on other sites More sharing options...
Robertybob Posted February 6, 2009 Author Share Posted February 6, 2009 Thank you all for your help and advice. I have adjusted the MAF using a CO2 Analyser and will be going for the re test next week. I will let you all know how I get on The worst that can happen is that i will have to fit the cats and oxygen sensors or maybe only the oxygen sensors. Lets see what happens Many thanks to you all. Anyone needing a solution for electric seat movement when the Seat ECU is missing or broken I can help Quote Link to comment Share on other sites More sharing options...
geoffbeaumont Posted February 10, 2009 Share Posted February 10, 2009 Anyone needing a solution for electric seat movement when the Seat ECU is missing or broken I can help Want to post that up? Don't think it's in the tech archive and it's a common problem. We did work out how to reset it when I had one, but I've forgotten Think it involved shorting a capacitor in the seat controller. Quote Link to comment Share on other sites More sharing options...
lwt big cheese Posted March 16, 2009 Share Posted March 16, 2009 I had problems with my emmissions. I looked for a Manufactured date and a First Registered date, only to find that the MOT directive has a Used date!!! I threw the lamda sensors and Cats away. Got my K reg tested as a Used in '92. i.e. before the Must Have date. Sorted! Quote Link to comment Share on other sites More sharing options...
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