AGU lambda problem.

Hey people i have an AGU engine in my mk1 golf '82. its been in there for over 2 years now with no problems. before i speak to the electrician thought id rattle your brains regarding a lambda fault.

Basically with ignition on reads .450 v as it should
car running up to temperature the lambda does not oscilate between 0.1 - 0.8 it just reads any where between 0 and .2 v
when you rev the car up it goes as high as .2 that is it.
but when you disconnect air mass it works better and works within its tolerences ????????

i have fitted new lambda twice and replaced air mass.

i have code read it and the only other culprit is the coolant temp sensor but this was replaced with a genuine one a year ago.
sorry if this sounds a little vague just wanted to know what influence lambda voltage in this respect.

i have checked continuety between ecu and lambda - lives and earths etc. many thanks

You do not say what the actual running issue is ?

I take it that you have a narrow band sensor fitted?

It will not give an accurate reading until it reaches about 300 degrees C.

0.5V is lambda ie 14.7 to 1 air/fuel and the sensor will only read from 14.3/1 to 15.1/1 at 0.8v and 0.2v respectively.

thanks for your reply - the car runs fairly smooth apart from when you boot it higher up and it feels a little restrictive  - i fault code read my car every now and then to make sure everything checks out and i came across this a few months back. it just so happens i booked a dyno session recently and i thought it would be a good idea to see what the fueling is like . it starts off very rich and then gets to about 16.0 lean at about 4500k where the dyno had to be cut short due to it running lean. it still pulled 207 hp with 244lbs torque.

how will i know if its narrow or wide band. it used to fluctuate between 0.1 - 0.8 before …………