MK2 VTS De-Cat Question
 

I have a magnex de-cat pipe to go on the old girl, however it doesnt have the hole for the sensor to go in.

1st Question
De-catin does it make a lot of difference?

2nd Question
Will the engine line always be on the dash

3rd Question
Do i just leave the sensor dangling or?

I have heard about those sleeves but surely that would just leave the light on?


Cheers
Steve :afro:

Yes it does make a difference, and dont kow to the other questions but will also need to know as am picking up a 2000 vts today :)

Tut tut Steve, this has been covered sooo many times before. However, I will try to answer your 3 questions, because I'm in a good mood! ;)

1) Yes, it's worth doing if you are looking to get as much power out of your engine as possible. Due to the restrictions in exhuast gasses that the CAT causes, you'll find that without it, your power will open a bit more towards the top end.

2) I pressume you mean "engine light?" ...The reason the 'engine check' light would become illuminated on the dash, is because the oxygen sensor which sits after the CAT will see that the CAT is not doing its job properly. You can fool this sensor by taking it out of the system completely, away from any exhaust gasses, and it won't report back to the ECU about the CAT being problematic.

3) No! The sleeve is for a reason. For the oxygen sensor to take readings, it needs to heat up to a rather high temperature. If you left it hanging around, it could burn something, or even set fire to your car! It needs to be well protected also, as these sensors are quite delicate.

stick sleeve on and light will go off

Can't you read or something?

1.) yes, quite a noticeable difference in throttle response i found.
2.) Yes.
3.) unplug the sensor.

Yes i can, please highlight the bit where you say the sleeve will turn the engine management light off, i cant quite see it.

didnt really plan on de-catin today :(
But couldnt get magnex centre to fit the cat so de-catted it, just unplugged the sensor, how long for the light to come on as it isnt on yet :homme:
Wotn fek my car having that light on will it?

Exhaust isnt sitting to good either points down a bit, should sort itself once lowered :y: plus was getting tired of playing around with it, so looks a bit shit but sounds alright!

no,
mines not fooked up,
lights on,
but who cares...
got a diagnostic tool to turn that badboy off for MOT's when i put the cat on.

tbh - mine didnt come on for 600 miles.

Answers number 2 and 3. Stop trying to be difficult. You could clearly see I spent some time trying to help on this thread, and you obviously pissed on my efforts. Perhaps I shouldn't bother in future...

cheers for comments, its made the exhaust really loud, pops and car now pulls from 3k revs instead of 4k :p chuffed all round.
Lights now on

cheers

Stop whining Toad... :homme:

wasnt trying to be difficult just summerising what you said in 5 words :P

and yes stop twisting on fella!

you tell him toad

get a mk1 vts you wont have this problem then lol

i had mine in a sleeve and the light still came on :s i plugged the sensor back into the decat and the light came on after about a 1000 miles and is still on now drives no different tho

That's correct, it shouldn't drive any differently, as that sensor is specifically for telling the ECU the condition of the CAT.

could that be the earth wire tho sam?

mine came on and was on diagnostics at citroen they told me i needed a new one, said il leave it for now, asked for copy of diagnostics report and all it said was earth wire loose hence why light was on

ive got one of those code reader things and its coming up as insufficent catylst

What's the generic code Sam? P0136?