Unstable return to idle when revving

[Aurega]

please i hope next message won't be "i replaced throttle pedal assembly and still nothing"

Don't worry without proper diagnostic no other investment... Thank you

[lizzard-t]

I cannot believe that no one can find the fuel trims.
Live data will show you them
Your looking for
STFT and LTFT .
Those throttle bodys were being replaced due to a trouble code .
The same thing was happening with the insigniaA.
It got so bad i think at 1 point 1000 odd throttle bodys were on back order .
Someone on here had that problem and his was off the road for months.vauxhall supplied him with a loan car ..
There are tests and parameters that have to diagnosed before hand .
Throttle pedal positions against value.
Wiring harness from pedal to throttle body.
Also, the ECU commands as well .
I know i did explain it to someone on here a few years ago.
If all is well with a outcome then it starts looking like. Internal ecu failure.

[Aurega]

Yea...
But I'm not sure why I'm not getting any values in Torque Pro...

[lizzard-t]

Maybe because you don't know how to use it or . there's something wrong with your version.

[Aurega]

not sure if its that hard.. I mean I selected realtime informations -> add display -> and from the list LTFT a STFT ... all of them but non shows anything... just no data...

[Aurega]

Hello,

so today I pick up my Insignia back from local garage.... result... they do not know whats the cause...they done lot of diagnostic... but only situation where the fuel presure is unstable is after return to idle... during drive nothing abnormal... the correction in fuel is so small that the car do not get any error or warning...
They told me that if the problem is high pressure pump the behaviour should be different... so...

I dont know guys

[.R.B.H.]

[Aurega]

Exactly

[Aurega]

Hello,

So finally solved the problem... The cause was EGR valve not working as should... After valve change the rev bumb is gone...

https://youtu.be/2o6tPrfzwbM?si=PVv-icSuxyC-4kbd

Thank you all!!!

[Drew]

Thanks for updating. That was a lot of work to get a result but hopefully that's the end of it