Engine: D5244: - Slight lag

Benji1985 · Dec 17th, 2015, 19:38

Good evening guys,
I have been doing quite a few little bits to my S80 D5 (2004) (lots of tiny things wrong), but the biggest issue i have is if cruising along say 40 in 4th/5th, if i then put my foot down to accelerate i get a bit of lag before she starts to pull, this seem to only happen when warm (mainly after an hour or so, or at least i notice it). i tried to lock of the vacuum to both engine mounts to see if i was losing air there, with no change.
I have experienced a lack of power on my S40 t4 which was due to the actuator getting "lazy", could this be this issue?

Thank you in advance

Ben

flakeypaul · Dec 17th, 2015, 22:06

I had exactly the same symptoms on my S80 2.0T Petrol - it was a knackered TCV (boost solenoid / turbo actuator).

I assume they're a similar setup on the diesel? Basically it was sticking open, bypassing the turbine wheel and giving no boost. The warmer it got the worse it got until I had no turbo at all.

Benji1985 · Dec 18th, 2015, 11:26

the only valve ican see is the one for the mounts?
is there a turbo valve TCV?

Ben

Longhouse21 · Dec 18th, 2015, 11:44

On the early D5 (Euro 3), the TCV is mounted on the front of the air filter housing and controls the vac engine mounts with the TGV just behind he starter motor on the front of the engine block controlling the turbo vanes.

flakeypaul · Dec 18th, 2015, 18:28

Assuming the diesel has a similar setup to the petrol, you should be able to follow the hose from your wastegate actuator back to the tcv/boost solenoid.

Takes about 2 minutes to remove and replace on the petrols, can't see the diesels being much different (but always happy to be corrected).

My second hand unit made a huge difference, but I will be replacing it (and the hoses) with new ones in the near future as there is still very slight lag when it kicks down at motorway speeds.

Benji1985 · Dec 23rd, 2015, 20:18

Update:
I have tested the vac mounts and both are not hold vacuum, however the lost is slow, i have tested the valve on the air box and it does indeed shut of vacuum to the mounts at just over 1000rpm.
Yet i still have a slight lag when accelerating after cruising.
I have cleaned the turbo control valve (the one above the starter motor), how do i test this valve?
what else can i check?

Ben

cheshired5 · Dec 23rd, 2015, 20:24

Quote:

Originally Posted by Benji1985

Update:
I have tested the vac mounts and both are not hold vacuum, however the lost is slow, i have tested the valve on the air box and it does indeed shut of vacuum to the mounts at just over 1000rpm.
Yet i still have a slight lag when accelerating after cruising.
I have cleaned the turbo control valve (the one above the starter motor), how do i test this valve?
what else can i check?

Ben

Have you blocked off the hose from the TCV to the mounts?

Benji1985 · Dec 23rd, 2015, 20:26

Quote:

Originally Posted by cheshired5

Have you blocked off the hose to the mounts?

Yes, same thing. Tad confused about this one, plus all the hoses seem to be in good condition from what i can see

Ben

cheshired5 · Dec 23rd, 2015, 20:29

When did you last change the fuel filter, what make was it and are these problems from before changing filter or after?

Benji1985 · Dec 23rd, 2015, 21:07

Quote:

Originally Posted by cheshired5

When did you last change the fuel filter, what make was it and are these problems from before changing filter or after?

fuel filter was changed about 4 months ago when the service was done, i did the service the day after i got the car (and also dismantled the EGR and cleaned it because each time i pulled away a bit hard, engine service came on and codes pointed to EGR, never been a problem since)
As for make, it was not a VOLVO one, i think it was a MANN one.

Ben

Dec 17th, 2015, 19:38	#1
Benji1985 Senior Member Last Online: Apr 6th, 2024 14:52 Join Date: Oct 2013 Location: Helston	Slight lag Good evening guys, I have been doing quite a few little bits to my S80 D5 (2004) (lots of tiny things wrong), but the biggest issue i have is if cruising along say 40 in 4th/5th, if i then put my foot down to accelerate i get a bit of lag before she starts to pull, this seem to only happen when warm (mainly after an hour or so, or at least i notice it). i tried to lock of the vacuum to both engine mounts to see if i was losing air there, with no change. I have experienced a lack of power on my S40 t4 which was due to the actuator getting "lazy", could this be this issue? Thank you in advance Ben

Dec 18th, 2015, 11:44	#4
Longhouse21 Master Member Last Online: Jul 24th, 2024 12:14 Join Date: Jan 2011 Location: Warrington	On the early D5 (Euro 3), the TCV is mounted on the front of the air filter housing and controls the vac engine mounts with the TGV just behind he starter motor on the front of the engine block controlling the turbo vanes. __________________ Current cars: 2003 V70 D5 SE (MY2004); 2012 CRV 2.0i V-TEC; Gone but not forgotten: 2001 Honda HRV; 1989 VW Polo C Mk2; 2000 Honda Civic VTi Aerodeck ; Cavalier SRi; Cavalier LX; 1971 Triumph Spitfire Mk3; 1963 Triumph Herald.

Dec 23rd, 2015, 20:29	#9
cheshired5 Premier Member Last Online: Dec 26th, 2021 13:42 Join Date: Dec 2013 Location: Crewe	When did you last change the fuel filter, what make was it and are these problems from before changing filter or after? __________________ 2002 S60 SE D5 Manual 209000 miles

Dec 17th, 2015, 22:06	#2
flakeypaul New Member Last Online: Apr 2nd, 2018 14:58 Join Date: May 2015 Location: East Yorkshire	I had exactly the same symptoms on my S80 2.0T Petrol - it was a knackered TCV (boost solenoid / turbo actuator). I assume they're a similar setup on the diesel? Basically it was sticking open, bypassing the turbine wheel and giving no boost. The warmer it got the worse it got until I had no turbo at all.

Dec 18th, 2015, 11:26	#3
Benji1985 Senior Member Last Online: Apr 6th, 2024 14:52 Join Date: Oct 2013 Location: Helston	the only valve ican see is the one for the mounts? is there a turbo valve TCV? Ben

Dec 18th, 2015, 18:28	#5
flakeypaul New Member Last Online: Apr 2nd, 2018 14:58 Join Date: May 2015 Location: East Yorkshire	Assuming the diesel has a similar setup to the petrol, you should be able to follow the hose from your wastegate actuator back to the tcv/boost solenoid. Takes about 2 minutes to remove and replace on the petrols, can't see the diesels being much different (but always happy to be corrected). My second hand unit made a huge difference, but I will be replacing it (and the hoses) with new ones in the near future as there is still very slight lag when it kicks down at motorway speeds.

Dec 23rd, 2015, 20:18	#6
Benji1985 Senior Member Last Online: Apr 6th, 2024 14:52 Join Date: Oct 2013 Location: Helston	Update: I have tested the vac mounts and both are not hold vacuum, however the lost is slow, i have tested the valve on the air box and it does indeed shut of vacuum to the mounts at just over 1000rpm. Yet i still have a slight lag when accelerating after cruising. I have cleaned the turbo control valve (the one above the starter motor), how do i test this valve? what else can i check? Ben

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