Turbo VNT actuator position on start up

tonygreen1966 · Sep 19th, 2020, 20:12

Hi,

I was looking at my VNT actuator arm position today. From what I remember it should move just after start up- but I may be getting that mixed up with my Citroen. Can anyone confirm. Mine didn't move just after start up. My car is 2003 XC90 D5. No fault codes etc.

Thanks

cheshired5 · Sep 19th, 2020, 20:28

Stays still on start up as vacuum is required by the engine mounts then as revs hit 1000, vacuum is cut from the mounts and the boost solenoid diverts it to the VNT actuator.
Lightly revving the engine to 3000 or so then releasing should be enough to see the VNT arm have full travel in both directions (around 20mm) and you can see the boost pipe bulge as boost increases.

tonygreen1966 · Sep 19th, 2020, 20:54

Thanks Cheshired5. I'll check that tomorrow.

Sep 19th, 2020, 20:12	#1
tonygreen1966 Member Last Online: Oct 7th, 2023 14:41 Join Date: Apr 2013 Location: UK	Turbo VNT actuator position on start up Hi, I was looking at my VNT actuator arm position today. From what I remember it should move just after start up- but I may be getting that mixed up with my Citroen. Can anyone confirm. Mine didn't move just after start up. My car is 2003 XC90 D5. No fault codes etc. Thanks

Sep 19th, 2020, 20:28	#2
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	Stays still on start up as vacuum is required by the engine mounts then as revs hit 1000, vacuum is cut from the mounts and the boost solenoid diverts it to the VNT actuator. Lightly revving the engine to 3000 or so then releasing should be enough to see the VNT arm have full travel in both directions (around 20mm) and you can see the boost pipe bulge as boost increases. __________________ 2002 S60 SE D5 Manual 209000 miles

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Sep 19th, 2020, 20:54	#3
tonygreen1966 Member Last Online: Oct 7th, 2023 14:41 Join Date: Apr 2013 Location: UK	Thanks Cheshired5. I'll check that tomorrow.

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