Oxygen Sensor

[shockwave]

I think my XR6T is burning too much fuel... When its stone cold, starting it and immediately putting it into reverse seems to flood the engine and it starts to cough and chug (I can smell the petrol). Reading other forum posts seems to point to the Oxygen sensor being at fault.

I have been to Ford and they tell me the computer is not reporting any faults with the Oxygen sensor, so it must be fine. The usual "tested and OK" response.

Could someone point me to where the oxygen sensor is, how I test it and how much it might be for a new one?

[Ninka]

I think my XR6T is burning too much fuel... When its stone cold, starting it and immediately putting it into reverse seems to flood the engine and it starts to cough and chug (I can smell the petrol). Reading other forum posts seems to point to the Oxygen sensor being at fault.

I have been to Ford and they tell me the computer is not reporting any faults with the Oxygen sensor, so it must be fine. The usual "tested and OK" response.

Could someone point me to where the oxygen sensor is, how I test it and how much it might be for a new one?

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I don't believe you can test these yourself.

The sensor is on the turbo dump pipe. You can see the green connector on the drivers side at the rear of the engine bay.

A new one runs at about $220

[Goldbullet]

I think my XR6T is burning too much fuel... When its stone cold, starting it and immediately putting it into reverse seems to flood the engine and it starts to cough and chug (I can smell the petrol). Reading other forum posts seems to point to the Oxygen sensor being at fault.

I have been to Ford and they tell me the computer is not reporting any faults with the Oxygen sensor, so it must be fine. The usual "tested and OK" response.

Could someone point me to where the oxygen sensor is, how I test it and how much it might be for a new one?

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The best way to test your oxygen sensor is to put your head out of your window and if you keep breathing it means its working fine.

[Chooka]

You can test them with a LED oxygen sensor tester, it should flash from lean, rich, lean, rich etc.

Most workshops should have one I would of thought???

Chooka

[shadyxr]

Just some info on sensors.

Bosch were the inventor of the oxygen sensor and according to them they have a service life of 50-100,00kms depending on the type.

There is the "Thimble" type sensors which typically have 1 or 2 wires from them or the "Planar" type which has 4 wires. The "Planar" type are the ones used on the T's etc I believe. They reach operating temperature 2 times faster than the thimble type which reduces cold start emissions by up to 50%.

Exposure to heat, carbon, soot, gases, antifreeze, thermal & physical shock etc cause the problems. I guess if we are punching more ponies out it may have an effect on reducing the life of them. All this info is straight from Bosch.

[Fat-Tony]

get your car put on a dyno, and have them prong an ego sensor up the zorst and see if the car is cycling in closed loop ie, if your getting an AFR of 14.7:1, if it is, then there is nothing wrong with the sensor.

[shockwave]

Thanks for all your help guys. I might remove it and see if there's any crap built up on it (carbon, dirt etc.)

[Fat-Tony]

Thanks for all your help guys. I might remove it and see if there's any crap built up on it (carbon, dirt etc.)

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have you seen where it is, have fun lol

[cqae]

anled tester is not really accurate enough & a gas analiser doesnt always react quick enough. The correct way to test an O2 sensor is with an oscilliscope. The BA has 4 wires-to are pos & beg for the sensors heater circuit, the other 2 are ground & signal. The signal wire should out put a waveform that changes 7-8 times per 10 second period from aroun .1-.8 volts-higher voltage indicates rich, low indicates lean. if less than 7-8 crosscounts, then sensor is 'azy' & needs to be replaced. If constantle rich or lean induce the reverse symptom & check for chagnes, o2 sensors need to react instantly. I use carby clean to richen them up, make sure the sensor peaks the drop to normal operation. These test must be done at normal operatin temp-a scan tool can also tell you if it is in closed loop. Multi meter reding are not sufficient as the will not give an indication of reation time or cross counts. your local auto elec will have all the equipment required as will many mechanical workshops.

we store & print waveform images and give them as a report when testing.