how bypass the catalyst on 2 lambda VTS

1. martinm10 Newbie Joined: Jan 2003 Czech Republic Posts: 4

   #1 17th January 2003, 15:42

   Hy all, I have question how to put out my catalyst on EURO 3 VTS with 2 lambda sensors? Is any kind how to outwit the ECU?
2. trickyd L-plater Joined: Jan 2003 United Kingdom Posts: 91

   #2 17th January 2003, 16:12

   Mine has 2 probes (2001 Model) and I've had a de-cat on since i bought it. No problems, not even an ECU light
   
   
3. KOTL_VTS16 Frequent Poster Joined: Jan 2003 Bogota Colombia Posts: 917

   #3 18th January 2003, 03:35

   I have a buddy that has had no problem what so ever with his de-cat VTS 2001.
4. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

   #4 7th December 2004, 03:54

   So If i have some problems with my cat (banging while changing the gears - probably these are his last days) I can get rid of it easly and there'll be no problem with the Check Engine light? I've a 2001 Saxo VTS and I think there are 2 lambdas in it.
5. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #5 7th December 2004, 04:01

   try it and see matey. there are little glove things that go over the sensor itself to fool it into thinking the exhaust emmissions are ok, but I cannot rememeber where you can get them from off hand
6. citrovts Frequent Poster Joined: Jan 2003 zwijndrecht Netherlands Posts: 733

   #6 7th December 2004, 04:04

   you can buy the lambda sleevs from GMCMOTORSPORT in scotland
   
   gmc
7. user_3656 Saxperience Addict Joined: Aug 2004 Herts. N/W London Posts: 13578 Project MK4 MoreDoor

   #7 7th December 2004, 04:13

   There you have it !
8. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

   #8 7th December 2004, 17:45

   Well Scotland It's quite far from me Maybe you know what are they made of so I could do something like that in here?
9. Scottp Administrator Joined: Dec 2002 Glasgow United Kingdom (Scotland) Posts: 26097 Chelski Traktor

   #9 7th December 2004, 18:19

   they would probably deliver to you
10. sevenfourate Regular Poster Joined: Dec 2004 Lowestoft,Suffolk. Posts: 374 Slammed,Cam'd+NOS'd VTR

    #10 10th December 2004, 02:21

    £21 delivered.Lamda from top of manifold (or FIRST Lamda)goes into bottom of new manifold/de-cat pipe and the one that WAS under car (second Lambda) fits into GMC sleeve.
    
    No more EML problems
    
    Worked for me.........
11. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

    #11 10th December 2004, 04:24

    But is it resonable to cut out cat in a serial exhaust? Cause I have a used one for only Ł17 so maybe its better to have in this situation?
12. sevenfourate Regular Poster Joined: Dec 2004 Lowestoft,Suffolk. Posts: 374 Slammed,Cam'd+NOS'd VTR

    #12 10th December 2004, 04:29

    Cat is for immisions regulations over here in the UK saxorulez.We need one to be road-legal if the car was manufactured after 1992
    
    I dare say they keep the noise down,improve immisions and improve fuel consuption(all trade-offs of a standard car manufacturer's aims and intentions).However they also "rob" the car of a few horsepower.
    
    Take it out !
13. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

    #13 10th December 2004, 12:50

    Quote:

    Originally Posted by sevenfourate We need one to be road-legal if the car was manufactured after 1992

    Same in Poland But untill I'll buy the sleve from GMC I'm going to get rid of this damn Cat cause it sound like dozen of pots under my car, during every gear change So if the ECU light turns on I can easly drive a car wright? And than after puting this sleve ECU should go out?
14. sevenfourate Regular Poster Joined: Dec 2004 Lowestoft,Suffolk. Posts: 374 Slammed,Cam'd+NOS'd VTR

    #14 10th December 2004, 12:57

    Some people drive with the EML light on for ages or even permanently,and their cars seems fine.
    
    Although your ECU compares readings between the 1st and 2nd Lambda sensors to set fuelling,ignition etc etc SO,if the light is on for this reason,its telling you it CANNOT compare the readings - so what its basing its settings on god knows !
    
    The sleeve from GMC encases the 2nd lambda and fools the car into reading "dirty clean air" !!! ie : The car normally needs to be reading that the gases from the 2nd lambda are cleaner than those from the 1st (showing the cat is working).Because we dont have a cat we have to "con" the ECU and this is what the sleeve does - it effectively traps some fresh air in the sleeve which will ALWAYS read cleaner compared the gases passing over the first Lambda and so your little ECU/EML light on dash goes out
15. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

    #15 10th December 2004, 16:48

    Good, I've emailed GMC about the prices and postage today. But I'm wondering about one thing if my cat is broken inside so it should not work propertly and ECU should goes on, am I wright? So maybe if the ECU light is not shining at the moment, it will not shine after de cat. Just like Trickyd and Kotl_VTS16 said...
16. sevenfourate Regular Poster Joined: Dec 2004 Lowestoft,Suffolk. Posts: 374 Slammed,Cam'd+NOS'd VTR

    #16 10th December 2004, 23:21

    Only one way.Try the de-cat and if the EML (engine management light) comes on then you'll have to get a sleeve from GMC.
    
    
    I wouldnt worry about driving for a few days with the light on to be honest....if you want to try it before you order the sleeve that is.
17. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

    #17 11th December 2004, 03:49

    And that is the answer I was hoping for Thx a lot
18. sevenfourate Regular Poster Joined: Dec 2004 Lowestoft,Suffolk. Posts: 374 Slammed,Cam'd+NOS'd VTR

    #18 11th December 2004, 05:35

    Glad to help
    
    
    Had my car rolling roaded once when i had Lamda problems.
    Not really sure of the implications but i seem to remember something about "open loop" and "closed loop" ?
    
    The guy who rolling roaded my car said "get it fixed" and made me aware of the problem but wasnt unduly concerned about it.
    
    Personally my car ran fine and the rolling road result that day showed no undue problems caused by the Lamda/s playing up and hence EML light being on.
    
    I also know of others the same and a few guys who have run for years ? like it as the GMC sleeves can apparently be a little bit "hit and miss" (tempremental).
    
    GOOD LUCK !!!!
19. saxorulez L-plater Joined: Nov 2004 Konstancin Poland Posts: 38

    #19 12th December 2004, 02:23

    I have a good news!! It wasnt a oat that was banging all the time, it was manifold, hiting in some nut. After a visit in a good garage everything is fine Now I'm going to collect some money and do the head work cause my headgasket is leaking...