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Model specific boards => Golf mk4 => Topic started by: davemk4 on 14 February 2013, 20:52

Title: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: davemk4 on 14 February 2013, 20:52

bit late to be worrying about this now but im having a custom  3'' downpipe with 3'' decat with flanges wleded to the oem cat and flanges onto the downpipe and jetex system that way i have a plug in/drop out decat/cat set up.

but i have 2 o2 sensors now obv thinking ahead

http://www.awesomegti.com/car/vw/golfmk4/42-draft-designs-o2-sensor-spacer

this would be fine. but untill this arrives.....the engine light im sure will come on with the decat tommorow. this doesnt bother me BUT will this cause car to go into limp mode etc?

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: DubAndDubber on 14 February 2013, 20:54

A headache is what reading this gave me. *in voice of yoda*

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: Scott D on 14 February 2013, 21:10

think a spacer on the 2nd lambda should prevent engine light coming on, shouldnt go into limp mode even if it does throw up a fault code

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: davemk4 on 14 February 2013, 22:26

I hope not.

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: dom on 14 February 2013, 22:55

I've been running a decat for at least 5k miles and haven't had the engine management light thrown up yet :cool:

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: crazy golf on 15 February 2013, 00:27

probly from the little i know only the agu aint fussy with atmos dump valves and de cats

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: davemk4 on 15 February 2013, 06:38

Mines a aum so a sneeze sets the light on lol

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: GTi_James on 15 February 2013, 08:23

Quote from: davemk4 on 15 February 2013, 06:38

Mines a aum so a sneeze sets the light on lol

+1  :angry:

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: davemk4 on 15 February 2013, 09:16

Well we going to struggle getting the oem cat to fit the custom down pipe. So going to fit a drop in drop out free flowing cat.

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: Metallix on 15 February 2013, 09:31

Take a trip to the dyno, test the decat vs. the high flow cat.

Will show you if there is a gain to be had

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: davemk4 on 15 February 2013, 11:23

Only using cat for mot time rest ill be drving catless

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: asboGTI on 15 February 2013, 16:14

my ARZ has got the ebay special on it and its fine no engine lgiht thrown up yet just a lovely noise to annoy the neighbours

Title: Re: off for a decat custom what about 2nd o2 sensor advice
Post by: dom on 15 February 2013, 16:29

Quote from: GTi_James on 15 February 2013, 08:23

Quote from: davemk4 on 15 February 2013, 06:38

Mines a aum so a sneeze sets the light on lol

+1  :angry:

Mine is also AUM, and as said above, been running without the cat for 5k+ miles without any warning lights :grin:

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: davemk4 on 15 February 2013, 20:55

 :grin: :grin: :grin: :cool: :cool: :cool: :cool: :cool: :cool: :cool: :cool:

listen to

http://www.youtube.com/watch?v=HGqb1IkmK7I (http://www.youtube.com/watch?v=HGqb1IkmK7I)


(http://i867.photobucket.com/albums/ab239/primeradave/3downpipe_zpsd6a4a4f2.jpg)

(http://i867.photobucket.com/albums/ab239/primeradave/3decat_zps9eeabf24.jpg)

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: davemk4 on 16 February 2013, 08:03

Engine light now on gay AUMS :-(

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: Wazzzer on 16 February 2013, 11:04

is that with the 2nd lambda spaced out?

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: davemk4 on 16 February 2013, 12:57

Yer it comes in at angle higher out. Unless they done far enough?

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: mar_k on 16 February 2013, 13:04

My mates AUM has been running this exhaust for a few months now with no issues other than breaking the rear Lambda

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: arran1993 on 09 May 2015, 07:23

I have just fitted a  n249 delete and 3" turbo back with decat to me aum golf and it's brought the light on and gone I to limp mode. Any ideas

Title: Re: off for a decat custom what about 2nd o2 sensor advice NOW WITH PICS/VID
Post by: Chris. on 25 May 2015, 02:10

unscrew lambda and tie it up out the way.  Or get it mapped out properly.

Old thread but sticking a OEM cat on a decat downpipe is utterly pointless.