decat problem

1. polan Regular Poster Joined: May 2007 basingstoke-hampshire Posts: 256 Saxo VTS Black 03

   #1 30th June 2007, 15:08

   hello ive been told that my car cannot propally be decated because of a sensor or something ??? if i do decat it i will have an ecu light on my car and could be dangerous in the long ride i am told is this right guys ? and does this mean i cannot have a decat because of location of this sensor ? thanks
2. Karl Saxperience Hardcore! Joined: Apr 2006 Ashford Posts: 25611 LY R26

   #2 30th June 2007, 15:13

   my cat had a sensor in it, I just unplugged the sensor and ran the new "decat" section.
   No problems as of yet,
   your engine management light will come on eventually though.
3. S34MER East Midlands Joined: Jun 2006 Derby Posts: 8305 Skoda Fabia VRS

   #3 30th June 2007, 15:14

   you may need to buy a second lamba sensor sleeve for it mate, GMC sell them iirc!
4. Karl Saxperience Hardcore! Joined: Apr 2006 Ashford Posts: 25611 LY R26

   #4 30th June 2007, 15:16

   i just unplugged the sensor. *shrugs*
5. S34MER East Midlands Joined: Jun 2006 Derby Posts: 8305 Skoda Fabia VRS

   #5 30th June 2007, 15:17

   fueling will be all over the shop without it though! hense the reason for the engine management light coming on, as a result of this emissions will be fucked too!
6. Karl Saxperience Hardcore! Joined: Apr 2006 Ashford Posts: 25611 LY R26

   #6 30th June 2007, 15:19

   I drove 600 miles before my light came on.
   Im still getting the same fuel economy
   and emissions are always gonna be higher without a cat.
7. polan Regular Poster Joined: May 2007 basingstoke-hampshire Posts: 256 Saxo VTS Black 03

   #7 30th June 2007, 15:21

   how and where would i need to go to have a second lamba sensor fitted and how much would it be costing roughly?
8. Karl Saxperience Hardcore! Joined: Apr 2006 Ashford Posts: 25611 LY R26

   #8 30th June 2007, 15:22

   all you do polan is unscrew the sensor in your cat, and screw it into a sleeve, then cable tie the sensor in the sleeve out the way.
   
   That sleeve is 25 quid delivered from GMC.
9. S34MER East Midlands Joined: Jun 2006 Derby Posts: 8305 Skoda Fabia VRS

   #9 30th June 2007, 15:22

   well your car must be special then!
   
   does the fact, your engine warning light is on, not show you that the car is having problems
10. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #10 30th June 2007, 15:29

    Quote:

    Originally Posted by S34MER fueling will be all over the shop without it though! hense the reason for the engine management light coming on, as a result of this emissions will be fucked too!

    Not exactly...
    
    The 2nd lambda sensor is ONLY used to take reading of the O2 levels and it's only use is to report on how healthy the CAT is as a result. This sensor does not make any adjustments to the car's fuelling whatsoever.
11. S34MER East Midlands Joined: Jun 2006 Derby Posts: 8305 Skoda Fabia VRS

    #11 30th June 2007, 15:35

    Thanks for clearing that up Toad.
    
    thought it had the same purpose as the pre cat sensor, but it took readings for the fuel after passing through the cat!
12. Toad Saxperience Post Whore Joined: Mar 2007 Reading Posts: 8980 French tin can

    #12 30th June 2007, 15:39

    You're welcome
    
    No, slightly different purposes. The 1st sensor in the manifold is more important with regard to performance. It has the ability to tell the ECU to adjust the fuelling to what it thinks it should be, however, it can only adjust a specific amount, which IIRC is quite small, but still enough to fail an MOT or make the car run poorly in low revs. I don't think it plays any part above 3000rpm though.
13. saunders Saxperience Forum Bum Joined: May 2006 Kent Posts: 3669 Fiat Seicento, MK2 Furio 2000 X, Pug 206

    #13 30th June 2007, 17:33

    Quote:

    Originally Posted by Soulless I drove 600 miles before my light came on. Im still getting the same fuel economy and emissions are always gonna be higher without a cat.

    Your EM light finally came on then Karl?