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General => The garage => Topic started by: Matt-T on 11 February 2012, 11:39

Title: Lambda Signal Wire Help
Post by: Matt-T on 11 February 2012, 11:39

Hi all, i own a Mk4 Golf unfortunately it is not the GTi, so hope you don't mind me posting.

What colour is the lambda signal wire?

Im guessing the two white ones are for heated element, which leaves me grey and black.
I need to tap into one to put an Air/Fuel Ratio gauge in.

Thanks in advance

Title: Re: Lambda Signal Wire Help
Post by: tshirt2k on 11 February 2012, 11:48

An air fuel gauge wont tell you much. Especially if its a narrow band sensor

Title: Re: Lambda Signal Wire Help
Post by: Matt-T on 11 February 2012, 11:59

Yeah i know,
Just gives me Lean, Rich, Optimal on a narrow band, where as a wide-band would be more accurate.

It was an impulse buy as i had a gauge holder for 3 gauges, and only had 2, so rather than buy and oil temp/pressure i just bought the A/F one.

Title: Re: Lambda Signal Wire Help
Post by: tshirt2k on 11 February 2012, 14:11

oil pressure would have been better.  :wink:

Title: Re: Lambda Signal Wire Help
Post by: Hoggy on 11 February 2012, 19:09

Im thinking that grey should be signal, about 90% sure :D

Title: Re: Lambda Signal Wire Help
Post by: danny_p on 11 February 2012, 20:52

i would advise against tapping into the signal wire from the lambda that the ecu is reading. 

the output from a narrow band sensor is very high inpedance or to put it another way the signal is very weack  adding something extra to system can distort the output from the sensor so the ecu ends up with an incorrect reading and ends up trimming the fuel incorrectly.

if you want the gadge even tho there next to useless as tshirt2k said.    fit another lambda for it idealy or just read the live data off the ecu before and after to make sure its not distorted the readings