Adam1984
Member
Are you an actual mechanic? Or just know a lot about Fiat?
It might be worth a shot for my ease of mind as might be nothing wrong with the car but a good thorough check would be good
General Oxygen sensor
- Thread starter Adam1984
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General Oxygen sensor
It might be worth a shot for my ease of mind as might be nothing wrong with the car but a good thorough check would be good
Are you using an elm327 Bluetooth dongle with the multiECUscan
If so have you acess to an android
The quickest way to see if the cars running okay is to check the short and long term fuel trims
It's hard to find in multiECUscan and is missing from some models, no idea on the post 2012
The 2 together should be zero give or take 10% hot engine at idle
There's no hills around here that should need first maybe there one near talaca, there one a new brighton that might be a 2nd if you have to go slow
Something is wrong with your car!
Your Oxygen graphic looks very bad. Because yours is the after-cat sensor. And it oscillates as it would be the pre-cat one. The pos-cat voltage should be more steady, it oscillates too, but very small lines. Yours tells that you have no catalytic converter there.
But that is not the reason your engine runs bad. It should run better even without catalytic converter. Something else is wrong there, too.
How much oil is the engine consuming?
PS: I put an O2 graphic with how it normally looks.
But that is not the reason your engine runs bad. It should run better even without catalytic converter. Something else is wrong there, too.
How much oil is the engine consuming?
PS: I put an O2 graphic with how it normally looks.
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Why, I no idea how you have come to this conclusion, maybe I missing something
Look at the time frame
It's isolating at 5 seconds peak to peak
Which is about right for a constant throttle while driving
It will go lean as you take the foot off the throttle
It will go rich as you push the gas down
Without knowing the load at the time the graph is meaningless, the sample rate is also very low
If I was to hazard a guess I would say the catalytic converter isn't a problem and be looking elsewhere, I the last 10 years I know of one effect drivability,.it usually picked up at an MOT well before it's an issue
The graph you posted is at idle no load, totally different and is from a Punto not running correctly anyhow
I often make mistakes or overlook something, I just don't see what I have got wrong here
In multiecuscan LTFT and STFT are called Multiplicative (FRA) and Additive (DTV) it's missing from some models of cars
If it's not listed your OBD2 adapter should work with this software if you have an android phone
Which I find easier for basic stuff
If it's not listed your OBD2 adapter should work with this software if you have an android phone
Which I find easier for basic stuff
Adam1984
Member
And would I need to do a phonic relearn after the timing belt was adjusted as the garage has told me they didn't do it.
It's supposed to be done according to the fiat documentation
I change the belt without loosening the camshaft pulley, belts are pretty accurate so never seen the point
If the pulley has been loosen (likely) then a phonics relearn would be advisable
It's pretty simple to do, as long as the engine is up to temperature and revs freely,
That would be fine if it would be the pre-cat sensor.
But it's the after-cat. It oscillates just like a pre-cat, like there's no catalytic converter.
It's not following the pre cat
Look at the time frame
Pre cat 02 has a frequency of 1.5-2 htz depending on rpm
Without the road speed, engine RPM, throttle position there's not a lot to be gained looking at graph
Multiecuscan frame rate is normally too slow to come to any conclusions
The cars is possibly not running correctly, pops from the exhaust, vibration and down on power
If unburnt air and fuel is entering the system the CAT will not be able to cope, looking at the post cat 02 will be meaningless
I don't understand how you can come to the conclusion to call the CAT a £120+ part from the data we have
It may or may not be working correctly, we just don't have the correct infromation
