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any car mechanics on hukd??

£0.00 @ HUKD
i need help!! Basically when im driving along, my petrol gauge is showing that i have no petrol in there (i know i have got petrol in my tank as i only filled up yesterday and i haven't really done a… Read More
danny09 Avatar
7y, 8m agoPosted 7 years, 8 months ago
i need help!! Basically when im driving along, my petrol gauge is showing that i have no petrol in there (i know i have got petrol in my tank as i only filled up yesterday and i haven't really done any driving). The gauge marker keeps going up and down (between the quarter of a tank and then to the empty white line. I had my MOT back in march and there was an advisory on there which was the Lambda sensor, can somebody please tell me if its the Lambda sensor which has gone so its making me think i have no petrol, or if it is another problem ???

Thanks people. Rep will be added :)
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danny09 Avatar
7y, 8m agoPosted 7 years, 8 months ago
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#1
Definitely not linked to the lambda sensor :thumbsup:
#2
peodude
Definitely not linked to the lambda sensor :thumbsup:


what does the lambda sensor do as its down as an advisory ? and do you know what the problem could be ?
#3
danny09
what does the lambda sensor do as its down as an advisory ? and do you know what the problem could be ?


http://www.picoauto.com/applications/lambda-sensor.html
1 Like #4
The lambda sensor is on the exhaust and monitors the level of oxygen in the exhaust gases. It then sends signals to the ECU to alter the air/fuel mixture to maintain the exhaust gases at a pre-determined composition.

boring reading for you
http://en.wikipedia.org/wiki/Lambda_sensor

In short, no this isn't the same problem. It sounds like your gauge is most probably faulty, although its not a definite.

Hope this helps you a little

BFM
#5
The exhaust gas oxygen sensor (EGO or O2), or lambda sensor, is the key sensor in the engine fuel control feedback loop. The computer uses the O2 sensor’s input to balance the fuel mixture, leaning the mixture when the sensor reads rich and enriching the mixture when the sensor reads lean.

Lambda sensors produce a voltage signal that recognises the amount of unburnt oxygen in the exhaust. An oxygen sensor is essentially a battery that generates its own voltage. When hot (at least 250 °C), the zirconium dioxide element in the sensor’s tip produces a voltage that varies according to the amount of oxygen in the exhaust compared to the ambient oxygen level in the outside air. The greater the difference, the higher the sensor’s output voltage.

Sensor output ranges from 0.2 volts (lean) to 0.8 volts (rich). A perfectly balanced or "stoichiometric" fuel mixture of 14.7 parts of air to 1 part of fuel gives an average reading of around 0.45 volts.

The lambda sensor’s output voltage doesn't remain constant, however. It flip-flops back and forth from rich to lean. Every time the voltage reverses itself and goes from high to low or vice versa, it’s called a “cross count”. A good O2 sensor on a injection system should fluctuate from rich to lean about 1 per second. If the number of cross counts is lower than this, it tells you the O2 sensor is getting sluggish and needs to be replaced.

Most lambda sensors will cycle from rich to lean in about 50 to 100 milliseconds, and from lean to rich in 75 to 150 milliseconds. This is referred to as the “transition time”. If the O2 sensor is taking significantly longer to reverse readings, this too is an indication that it is getting sluggish and may need to be replaced.

Observing the sensor’s waveform on a scope is a good way to see whether or not it is slowing down with age. If the sensor becomes sluggish, it can create hesitation problems during sudden acceleration.
#6
The lamnda sensor is an o2 sensor, the engine uses this figure to know how much fuel to inject into the engine. I don't know how you can have an advisory on it, they usually work or they don't, no inbetween.

Your fuel gauge problem is related to the way the tank measures the fuel, some systems use a float (much like the ball in a toilet) and other use electrical sensors to monitor the level.
#7
from what you describe it would appear that your wires from the tank are what they call earthing out, try this, whilst the ignition is on get someone to wiggle the wires from the tank, they maybe on top of the tank, if it starts working then theres your problem.
this fault has nothing to do with the lambda sensor, but they are very cheap around £6 each easy to fit yourself, you just need to know which one is at fault if you have more then one.
1 Like #8
As the sensor ages, it becomes sluggish. Eventually it produces an unchanging signal or no signal at all. When this happens, the Check Engine Light may come on, and the engine may experience drivability problems caused by an overly rich fuel condition. Poor fuel economy, elevated CO and HC emissions, poor idle, and/or hesitation during acceleration are typical complaints.


Those are the problems caused by that sensor malfunctioning, so I guess you have another problem :)
#9
wickedteen
from what you describe it would appear that your wires from the tank are what they call earthing out, try this, whilst the ignition is on get someone to wiggle the wires from the tank, they maybe on top of the tank, if it starts working then theres your problem.
this fault has nothing to do with the lambda sensor, but they are very cheap around £6 each easy to fit yourself, you just need to know which one is at fault if you have more then one.


If you know somewhere that sells them at £6 post it as a deal. Reckon it would be hotter than the sensor gets :w00t:
#10
last time i got mine was about 2yrs ago for my scorpio cosworth i needed 4 of them, they charged me £6 each, local parts shop in hitchin
#11
4 lambda sensors at £6 a time, thats really very very cheap. Why 4 though?

Most normal cars have 1 or 2......don't they?

BFM
#12
BurningFeetMan
4 lambda sensors at £6 a time, thats really very very cheap. Why 4 though?

Most normal cars have 1 or 2......don't they?

BFM


it was a ford scorpio cosworth it was a 3litre V6 so had two exhausts, so therefore it had two in the down pipes and two in the middle boxes

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