Decat- no sensors plugged it = over fueling?

1. CitroenSport Established Member Joined: Nov 2008 Newcastle Upon Tyne Posts: 1984 MK2 VTS 153bhp

   #1 19th June 2010, 18:41

   My mk2 VTR is decat as I put a mk1 downpipe on, but there were no holes for the lamba sensors so I just taped them up and left them but my engine management light is on, will this make the car overfuel?
   And what can I do to stop it without putting cat on or different mani on?
2. wicked-vtr Saxperience Forum Bum Joined: Jan 2009 Surrey Posts: 2608 200sx s14a mark 1 vts

   #2 19th June 2010, 18:53

   is the pre cat plug in or neither of them?
3. LeeM Saxperience Post Whore Joined: Feb 2008 Liverpool Posts: 7393 Black Corsa C SRi

   #3 19th June 2010, 18:57

   no precat lambda and your car will overfuel yes. drill a hole, screw it in. sleeve the post cat lambda
4. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

   #4 19th June 2010, 19:02

   You want the pre-CAT lambda connected to adjust fuel trims.
   
   It doesn't need to be screwed directly into the manifold, as long as it's somewhere in the exhaust before the CAT.
5. user_29491 Saxperience Forum Bum Joined: Dec 2008 Lancs Posts: 4124 JP4S'd R.

   #5 19th June 2010, 19:06

   I've not had any of the lamba sensors plugged in for 20k+ miles, no problems, uses same amount of fuel.
6. user_15516 Saxperience Post Whore Joined: Apr 2007 Posts: 6640 Integra DC5R & VTS

   #6 19th June 2010, 19:18

   The car runs, but the fueling isn't as 'refined' as it is with the sensor connected. If it wasn't needed, then cars wouldn't come with them.
7. CitroenSport Established Member Joined: Nov 2008 Newcastle Upon Tyne Posts: 1984 MK2 VTS 153bhp

   #7 20th June 2010, 00:25

   So what have I got to do? Drill a new hole for the 1st sensor? And what's sleeving the other mean?
8. PETE-VTR Established Member Joined: Aug 2008 york/ north yorkshire Posts: 1953

   #8 20th June 2010, 01:07

   there should be a hole in the downpipe on the right hand side for the probe. odd one is that.
   
   drill a hole and thread it, leave the other one wrapped up or put it into a sleeve of some sort
9. CitroenSport Established Member Joined: Nov 2008 Newcastle Upon Tyne Posts: 1984 MK2 VTS 153bhp

   #9 20th June 2010, 11:46

   there is no hole on the actual manifold as the manifold and down pipe are off a mk1 1.1 or 1.5d lol ?!?!?!
   
   and where would i get the tool from to create the thread for the lambda sensor?
10. PETE-VTR Established Member Joined: Aug 2008 york/ north yorkshire Posts: 1953

    #10 20th June 2010, 13:04

    you can get them from any good motorfactors, or find a bolt the right size as your probe and force that in to thread it.
11. maddison_vts Established Member Joined: Sep 2008 Torbay Posts: 1565 2000 phase 2 Saxo VTS Turbo 2000 Nissan 200sx S14a

    #11 20th June 2010, 13:35

    i may be wrong in saying this but i'm pretty sure this is right....
    
    without the lambda it will fuel incorrectly but when above 40% or 50% throttle, the fuelling is not off the lambda therefore making it fuel no differently.
    
    i'm sure thats true, however, don't shoot me if it isn't.
12. CitroenSport Established Member Joined: Nov 2008 Newcastle Upon Tyne Posts: 1984 MK2 VTS 153bhp

    #12 20th June 2010, 18:29

    Ok will see what I can do, will let you know