GMC Sleeve

1. FILVTR Regular Poster Joined: Oct 2006 Manchester Posts: 440 VTR '52.

   #1 20th November 2006, 22:42

   Fitting a 4-1 manifold on a mk2 vtr (cat in downpipe). The second lambda sensor which is plugged into the cat, the one which is screwed into the GMC sleeve:
   
   When lambda is screwed in, will this not cause the light to come on th dash as the sensor isn't reading gases in the cat where it should be?. Fitting this next week but want to know if this will cause overfuelling as engine may run rich.
   
   Does anyone have one fitted and have any problems with lights coming on/ running rich?
2. Sean Saxperience Post Whore Joined: Feb 2005 St Andrews United Kingdom (Scotland) Posts: 7384 Green mk1 vtr/s and Focus zetec

   #2 20th November 2006, 22:59

   the purpose of the second probe is to check the exhaust gas is cleaner after the cat than it was before the cat. with it plugged into the gmc sleeve, it fools the ecu into thinking the probe is reading clean air therefor allowing the cat to be removed.