Greetings from germany and a question about high idling my V70R

[jonesg]

cracked turbo housing and high idle, you solved it.
o2 sensor reads the excess air being drawn into the exh stream and ECM registers a lean condition ,
so it dumps fuel into intake to balance the mix, idle goes up.

[Hamburger]

Sounds logical... The crack is from the internal wastegate (exh-site) to the exhaust. in my understanding ist just "exhaust internal"

I'm chasing a new / refurb Turbo, lets see what i'll find

[Hamburger]

Got a call from my trusted workshop, i got the "Abgasuntersuchung" without finding any fault, since there seems to be none...

Fun fact, i found another guy here in germany with the same symptons on his R, not getting any TÜV, he gave the car to Volvo where he was TÜVed without faults...

I'll keep working on the R, maybe on that way i can find the fault, or not... who knows

Now i need to tell the TÜV guy in my most patient way that the Cunifer brakelines are better than rusted steel, we got a lot of newbies from "TÜVschool", they don't have the feel for older cars.

[firstv70volvo]

Got a call from my trusted workshop, i got the "Abgasuntersuchung" without finding any fault, since there seems to be none...

Fun fact, i found another guy here in germany with the same symptons on his R, not getting any TÜV, he gave the car to Volvo where he was TÜVed without faults...

I'll keep working on the R, maybe on that way i can find the fault, or not... who knows

Now i need to tell the TÜV guy in my most patient way that the Cunifer brakelines are better than rusted steel, we got a lot of newbies from "TÜVschool", they don't have the feel for older cars.

Something is being missed in all this. If the rpms are changing when the throttle is held steady then there’s has to be something showing up in live data to indicate what is changing that isn't expected to change.
Either the throttle position is changing or the air/fuel supply is changing with a steady throttle.
If the throttle pedal input is steady and the throttle plate is changing this will show up in the throttle position sensor live data readings and MAF air flow readings. Throttle and MAF readings should remain steady during testing at constant, higher rpms.
If the throttle plate position sensors and MAF readings are steady while the rpms increase and decrease then there’s a changing air/fuel problem and after the MAF. This should show up in the short-term fuel readings and MAP pressure readings. This would be an air leak after the MAF.
If the throttle plate position sensors readings are steady and MAF air/flow readings are changing then this indicates changing air flow due to changing intake manifold pressure and this could be caused by a number of things, PCV system blockage or intake manifold check valve, blocked exhaust, turbo control valve issues, anything that may change the intake manifold pressures while the throttle plate remains steady. MAF air flow readings may not change under some of these conditions. Short-term trim and O2 sensor readings will likely be changing with rpms.
For the manifold pressure changes a good old vacuum gauge can be connected to the intake manifold, there is an easy access point on the right side, the vacuum hose that goes to the turbo by-pass diaphragm can be disconnected and the gauge plugged in there. This is good for checking exhaust flow restriction and any changes in manifold pressures for whatever reason, which should be steady during the higher rpm testing.
There is something changing in the live data as the rpms increase and decrease that will provide the clue to what's going on.

[matthew1]

Something is being missed in all this. If the rpms are changing when the throttle is held steady then there’s has to be something showing up in live data to indicate what is changing that isn't expected to change.

aaf-3117055946.png (229.26 KiB) Viewed 1310 times

[matthew1]

A fresh set of eyes would do wonders in tracking this down.

(still following)

[Hamburger]

If i got my R back i'll keep up to find the error.

the Pedal position and its signal to the throttleblade jumps with the rpm, hard to tell if its the cause or effect

[firstv70volvo]

If i got my R back i'll keep up to find the error.

the Pedal position and its signal to the throttleblade jumps with the rpm, hard to tell if its the cause or effect

What about the throttle plate position sensor values, do these values change with changes in the rpm and the change in pedal signal? I wouldn't expect the accelerator pedal sensor signal to change if pedal position is held steady but I'm not sure if there is some compensation done through the pedal signal.
It would be good to know if the throttle body motor/throttle plate is changing position with rpm changes, this would mean the rpm changes are occurring due to an actual throttle plate change, which helps eliminate other possible problems such as an air leak in the system. If the throttle plate position is changing with rpms then that's helps narrow and focus the problem.

[Hamburger]

after a long chase, i hunted down a new Turbo.

After approx 250k km my red brick has earned a new one.

Since there are some uncertainties aboout the old Turbski, i'll chase this fault further once i got it installed.

i need to check when there is enough time (and beer) to disassemble half of my R to change it.

Further i am in touch with a suisse company here in Hamburg to check if the cracked housing is repairable.

[Hamburger]

After a nice weekend of wrenching the Turbo is installed.
A new intercooler from do88 followed him in my R. You can see the hose for the aux intercooler is pretty plugged.

Since im "already here" i'll straighten some other flaws and do the haldex service.