Decat "bung" question..

[Jack Gilbert]

hello,


when using a decat should you use a bung on the secondary lamba sensor or screw it into the exhaust?
just wondering why people bung them if they have the option to screw it in?

hope that makes sense!

jack

 

[Rob]

You can screw it into the exhaust and just unplug it.

The reason it's left out is obviously, with there being no CAT, the emissions picked up by the second lamba sensor would register a problem.

 

[Jack Gilbert]

so if you unplug the second lamba you shouldnt get the light? :O

 

[Rob]

I ran my ph1 like this and it was fine yeah. Both lambda's where there and only the first one was plugged in.

 

[Dan]

Will the light go out after a while of thinking theres no emissions if I just unplug it or does it need to be a code reader job to rid the bugger?

 

[tanker]

Got both mine plugged in, no light at the mo?

 

[Dan]

Got both mine plugged in, no light at the mo?

Took about 1K till mine came on.

 

[Rob]

Probably need a cheapo code reader tbh.

 

[Gray]

It's hit and miss if you get the emissions light IMO... Mine ran with a de-cat for 20K with no emissions light

 

[Rob]

Mine ran about 50k, so yeah, very hit and miss.

 

[Chris205]

Will this have any effect on the Air/fuel Ratio? I've got a bung to put in the secondary sensor so did you lads just completely take off the 2nd lambda sensor and unplug it from the car?

 

[Rob]

I left the sensor screwed into the decat and then unplugged the sensor at the connection under the car.

Had no effect on my ph1 AT ALL. But as said, it's hit and miss,

I still returned 44mpg on long journeys etc and it was still a very quick ph1.

 

[Chris205]

Might give it a go Rob, something not right with mine atm, seems to have completely lost its spark

 

[Rob]

May I suggest some new plugs?

 

[Chris205]

May I suggest some new plugs?

I like what you did there

It's due an oil change actually so will have to get somemore millers CFS ordered