What's this sensor / valve ? - Page 2

Pjrebordao · Dec 7th, 2015, 21:12

What's the purpose of the tcv? Modulating turbo pressure to "shape" the torque curve ?

cheshired5 · Dec 8th, 2015, 13:00

Quote:

Originally Posted by Pjrebordao

What's the purpose of the tcv? Modulating turbo pressure to "shape" the torque curve ?

Pretty sure it's to divert vacuum to and from the engine mounts dependant on engine speed.
Once over 1500rpm, vacuum is diverted to the boost solenoid which in turn controls how much vacuum the turbo actuator receives.

......or I could be wrong so follow the pipes.

Pjrebordao · Dec 8th, 2015, 21:45

Can anyone post a pict of the tcv in place ?
I'm not sure if mine is in the right spot and its held with a zip tie...

Dancake · Dec 8th, 2015, 22:04

It should clip onto the air filter box. If it's held on with a cable tie, the clip may have broke, or it may not be a Volvo valve. Loads of other marques use exactly the same valve, so nothing to worry about there.

dme123 · Dec 15th, 2015, 12:16

Quote:

Originally Posted by Dancake

It should clip onto the air filter box. If it's held on with a cable tie, the clip may have broke, or it may not be a Volvo valve. Loads of other marques use exactly the same valve, so nothing to worry about there.

I ordered a new one for my 04 MY V70 T5 from Volvo and it had no clip!

flakeypaul · Dec 15th, 2015, 21:36

My 2.0t was running like a bag of spanners (when it kicked down it didn't know whether to accelerate or surrender), I found a replacement boost solenoid/tcv on a dead T5 for £10, swapped it over, big improvement.

Hoses are only cheap, the red marked one takes the pressure from your turbo, the yellow one feeds it to the wastegate actuator, and the blue one feeds the wasted stuff back into your air intake just before the PCP nipple.

If the solenoid or hoses are knackered it will affect the turbo's performance, they're only £50 new from Volvo, I'll be changing my replacement and hoses out for new ones next time I service the car jut for peace of mind and bhp.

If there's crud in there then it must be coming either from the turbo (bad) or PCP nipple (routine service is to clean/replace the PCV system and PCP nipple).

Dec 8th, 2015, 22:04	#14
Dancake Premier Member Last Online: Today 12:44 Join Date: Apr 2011 Location: Belfast	It should clip onto the air filter box. If it's held on with a cable tie, the clip may have broke, or it may not be a Volvo valve. Loads of other marques use exactly the same valve, so nothing to worry about there. __________________ 1996 850 T5 - Sold 2003 S40 1.9d - Sold 2004 S60 D5

Dec 7th, 2015, 21:12	#11
Pjrebordao Junior Member Last Online: Sep 2nd, 2019 18:11 Join Date: Dec 2015 Location: Lx	What's the purpose of the tcv? Modulating turbo pressure to "shape" the torque curve ?

Dec 8th, 2015, 21:45	#13
Pjrebordao Junior Member Last Online: Sep 2nd, 2019 18:11 Join Date: Dec 2015 Location: Lx	Can anyone post a pict of the tcv in place ? I'm not sure if mine is in the right spot and its held with a zip tie...

Dec 15th, 2015, 21:36	#16
flakeypaul New Member Last Online: Apr 2nd, 2018 14:58 Join Date: May 2015 Location: East Yorkshire	My 2.0t was running like a bag of spanners (when it kicked down it didn't know whether to accelerate or surrender), I found a replacement boost solenoid/tcv on a dead T5 for £10, swapped it over, big improvement. Hoses are only cheap, the red marked one takes the pressure from your turbo, the yellow one feeds it to the wastegate actuator, and the blue one feeds the wasted stuff back into your air intake just before the PCP nipple. If the solenoid or hoses are knackered it will affect the turbo's performance, they're only £50 new from Volvo, I'll be changing my replacement and hoses out for new ones next time I service the car jut for peace of mind and bhp. If there's crud in there then it must be coming either from the turbo (bad) or PCP nipple (routine service is to clean/replace the PCV system and PCP nipple).

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