02 sensor voltage output

Willos · Jun 18, 2013

These are these symptoms. 4.0 thor
On start up the car revs to 2000-2500. If I then put into gear quickly drops to 1500.
Erratic tick over and fault code for misfire now and again.
o2 oxygen sensor output volts:
bank 1 0.455 v with no change when reving
bank 2 0.000 with no revs and changes very slightly on rev up
Are both faulty or just one or another problem.
short term fuel trim stays at 25% on both banks

Just ordered 2 new o2 sensors. am I barking up the wrong tree ? No Ruff running jokes please LOL

rewmer · Jun 18, 2013

You should see between 0 volts and .8 cycling between the two every 1 second or so when at operating temperature. What's the MAF reading on idle ?

Blanny · Jun 18, 2013

Air flow

rewmer · Jun 18, 2013

Just as a supplemental, what equipment are you using to to read the O2 sensors?

StuckAgainSteve · Jun 18, 2013

You're misreading the data. The non changing value is the dummy (post cat?) Lamdba voltage for non NAS vehicles.

rangy35 · Jun 18, 2013

I read your other thread, you are wasting your time.......with the worn cam lobe you have you will not get your fuel trim sorted.

Willos · Jun 20, 2013

Well new lamdas in. I can see that its fueling a lot leaner as the fuel mpg shot up to 20-24mpg . I still have very rough idle and its up and down. It must be a plug as i have magnacors in. I've pulled a plug off 7 and no difference. Plug off 5 no difference
Plug off 3 no difference and the same with 1. The other bank is tight as i have the vapouriser above it so will renew plugs in the morning.
What will a faulty cam sensor do . Are they an on off job as its come up with fault codes once for it . If all fails its off to the indy down the road.

Willos · Jun 20, 2013

Just another thought.
Is the cam sensor magnetic, as the swarf from the knackered tappet would cause a break down in signal. It revs fine just the tickover
Ive just read another thread about cleaning swarf off the sensor
any input on this

eightinavee · Jun 20, 2013

What Maf readings are you getting at idle and 3000rpm ?

02 sensor voltage output

Willos

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rewmer

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Blanny

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rewmer

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StuckAgainSteve

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rangy35

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Willos

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Willos

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eightinavee

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