T4 boost issues

Deal quest · Apr 7th, 2014, 23:59

Hi
I have a 2001 s40 t4 150000 miles. The car boosts perfectly when engine is cold but after 10 minutes of driving, when engine is at running temperature its just like driving a non turbo car. I have checked all pipes to the turbo for leaks and they seem fine. Any help would be appreciated.
Thanks in advance

Baffler · Apr 8th, 2014, 00:40

Turbo boost control solenoid?

It's located on the rear side of the air filter housing. Find and follow the hose from the solenoid to the wastegate actuator and disconnect it...drive the car as you normally would and bring it up to temp but don't drive it on too hard (not over 4k+ revs) as you now have no control over the boost and you could easily bend a conrod. If it continues to boost after reaching normal operating temp then you can suspect your solenoid is probably kaput.

Deal quest · Apr 8th, 2014, 22:26

Thanks liam, ill give that a go at the weekend

Apr 7th, 2014, 23:59	#1
Deal quest New Member Last Online: Oct 7th, 2015 13:28 Join Date: May 2013 Location: wexford	T4 boost issues Hi I have a 2001 s40 t4 150000 miles. The car boosts perfectly when engine is cold but after 10 minutes of driving, when engine is at running temperature its just like driving a non turbo car. I have checked all pipes to the turbo for leaks and they seem fine. Any help would be appreciated. Thanks in advance

Apr 8th, 2014, 00:40	#2
Baffler Premier Member Last Online: Today 14:56 Join Date: Dec 2002 Location: Co. Limerick, Ireland	Turbo boost control solenoid? It's located on the rear side of the air filter housing. Find and follow the hose from the solenoid to the wastegate actuator and disconnect it...drive the car as you normally would and bring it up to temp but don't drive it on too hard (not over 4k+ revs) as you now have no control over the boost and you could easily bend a conrod. If it continues to boost after reaching normal operating temp then you can suspect your solenoid is probably kaput. __________________ Liam... '96 854 TDI SE, '99 V70 2.5D S, '05 C70 2.0T Collection, '05 S80 2.0T SE, '15 V70 D4 SE Lux Nav.

Apr 8th, 2014, 22:26	#3
Deal quest New Member Last Online: Oct 7th, 2015 13:28 Join Date: May 2013 Location: wexford	Thanks liam, ill give that a go at the weekend

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