Decat causing lambda light?

[Crazy_C]

Was just wondering, would a decat cause the lambda light to come on occasionally? Cos when I boot it, the lambda light comes on, but if I have a few days of steady driving, it goes off again, and it's only been like this since the decat, so it's the only thing I can think of, but just thought I'd check.


Also, I'm getting rid of the muffler box at some point too, will that have an affect on the lambda light?

Cheers

[p fandango]

you should have only the one lamba sensor pre-cat so no it won't affect the emmissions light, same with the silencer

[Crazy_C]

Must be one of the hoses leaking slightly when I boot it then. Cheers

[TenaciousC]

Lambda (ecu) light will come on for a number of reasons. This is not necessary a Lamba sensor issue. Check ECU fault code log to find cause. I have exactly the same issue caused by occasional overboost where the light will come on after booting it and stay lit for a few days. See this thread.

Removing the CAT on the 850 shouldn't have any direct bearing as there is only one Pre-Cat sensor. The 70 series has one either side of the cat.

Cheers

C

[Crazy_C]

Yea, I did a test run today on my way back from work checking the boost gauge, and when it's boosting over 14psi, which it'll occasionally do when it's cold.

[martybelfastt5]

sorry for hijack how does the decat feel compared to before?

[woody]

sorry for hijack how does the decat feel compared to before?

Good question, I'm keen to do this mod!

[p fandango]

certainly alot better with a decat, the revs pick-up alot quicker & for the £20-30 to get it done well worth the money

[Crazy_C]

Yea, really does make an improvement, much better throttle control too I'm gonna get the muffler removed too at some point for a straight through pipe

[watchmytracer]

how does this decat and straight through affect the car come mot ?

[Jimmie]

Fail.

[Crazy_C]

Mine still passes emissions at the moment with just a decat. Only just though lol

[pigfight]

mine failed miserably with a decat!! (tried all the usual tricks: forte gas treatment, redex fuel treatment, a few miles of 'spirited' driving to get really hot!! etc.) so had to have the cat refitted, and theres a definate loss of power, so im now in the market for a race cat!
anyone got any pointers on what to go for? or will a universal 200 cell off of 'fleecebay' do the job?

[Crazy_C]

Pointer on what to go for - Get mates who are MOT testers LOL