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Ok thanks. I’m starting the get somewhere I think.
I do have a diag reader, and have looked at the graphs.
One bank moves between say 0.6 and 0.4vThe other bank, likes to get stuck around 0.1. And this is why I changed the sensor on this bank, just in case.
However the fuel trims for both banks track together.
I have checked the fuel pressure many times. Its ok. Not high.
The problem seams to occur at idle. If I drive on the highway, the trims are good.
When I have the AirCon on, it seams to cause a lot of spikes on the graph. (at idle – when clutch kicks in)
I could believe an evap problem. Things get bad when I refuel.
I tested the purge valve recently. I followed the video guidance! It fully closes, and when manually put 12V to it, the engine stalls.
Thanks for the reply. Have you seen my other post here:
Yes I would love to replace the exact faulty part! But also, if you don’t change anything, nothing improves.
I did monitor the O2 graphs and noticed a trend with bank B, that the trace would stay low a lot. So thought I best replace to rule out a faulty sensor.
I know most cars do the fuel trims on the sensor nearest the engine, but I’m sure this car is doing it on post cat sensors!
sensors nearest the engine read around 3V.
Post cat sensors are 0.1-0.9V. Cables aren’t long enough to swap roundwhen the weather got cooler in September, and I had a small hole in the EGR blank, the fuel trims were quickly going negative.
So I replaced an oxygen aenaor. Didn’t seam to improve it.
I have temporarily blanked the EGR and it’s much happier.
Fuel trims now about 2%
Only issue is the ECU knows I have blanked it and thrown p0400
Thank you for the reply.
The car is a 2001 jaguar with denso sensors
I’m a bit confused about what comes first!
The fuel trims are going around to -10% -20% at idle (but ok on motorway).
Is this rich or weak?The car is reporting too rich fault codes (and I believe that by the MPG and sooty plugs)
But you say 3.4V is lean? So is that causing it to richen?
I’ve seen one bank oxygen sensor likes to get stuck low at 0.1V rather than oscillate like the other bank. (but this sensor is post CAT)
Note to self.
I squeezed the eval pipe but the engine note did not change.
I activated the evap solenoid with 12v and the engine stalled. I repeated this twice.Evap solenoid is good to me.
What else can cause rich condition?
Sooted up oxygen sensor?
Having watched more videos
The fuel trims seam to be around -10% to -20% AT IDLE.
Don’t think my oxygen is cycling 0.1 – 0.9 at idle. Maybe as TPS isn’t at 0%?Good luck with your new job. I know it is key.
Diagrams of evap system.
What is fitted to mine is a hybrid of both of them!
2 canisters and no one way valve.
no electric valve by canister.UK evap system
USA evap system
