V50 Engine 2.0D : 2006 v50 2.0d limp mode

[Pezzyk]

Hi guys new to this site,
Got myself a little issue.
I have a 2006 v50 2.0d e4 se sport,
After buying the car i decided i would stick my foot down to see what she would do.
Big mistake of mine
I booted it through 1st and then right through 2nd but as soon as the car came to around 3500-4000rpm (harsh acceleration) it put itself into safe mode and started to overfuel like crazy (knocking it head off like a black cab) and this in turn threw up the engine system service required light.
This obviously limited the cars power
After turning it off for a few minutes and starting it back up everything was back to normal and the car had full power again.
Took it to a local volvo specialist and they plugged it in to find no fault codes stored (this being after we got the car into limp mode again simply by flooring it)
After this a chap came from in the back and heard the car overfueling and knocking away and he proceeded to state that it was the fuel pressure switch under the pump. But to fix i needed to buy a new pump at around 800 without labour to fit as the switch doesnt come separately. When asked would this fix the problem he said well it ahould but cant guarentee it.
Also i may add that under gradual acceleration the car just pulls and pulls through each and every gear the issue is only under fast acceleration
Has anyone else had this problem with theirs? Or anyone know if this sounds right just dont want to pay out aload of money when it may not resolve the issue.
Thanks

[Tannaton]

If it's gone into limp home mode and the MIL lamp on - there will be a code stored. I've never seen one go into limp mode and not store a code (even if it doesn't put the MIL lamp on).

Was there also a message on the display?

Usually limp home mode under hard acceleration is turbo boost related - often this is something simple like a vacuum pipe off or sticking actuator.

You could buy a second user fuel pump for less than £100 and take the regulator off that - it's a 30 min job to change the pump and most of that time can be bleeding the system afterwards.

It might be worth paying a Volvo dealer the half hour charge to read the car with VIDA - it may be a very simple fix.

[Pezzyk]

Thia is the thing that had them at volvo scratching their heads, as they plugged it into their system (vida) and it wasnt bringing any fault codes or messages up. The only message on the dash was engine system service required along with the yellow (i) in the middle of the dash (same light as when a bulb goes out etc) not actually the engine management light
This is why they are assuming the pressure switch on the pump. I was hoping they wouldnplug it in and be able to pinpoint the problem but they couldnt with no codes etc.

I just find it all frustrating as the car drives faultless apart from a hummung noise when you go over 40, think that is cheap tyers though, unless you accelerate hard which sometimes is needed then it has a hissy fit and cuts all power to which inthen look an idiot after trying to get past someone i am then crawling until it rectifies itself. It can last anything from being in limp mode for 10 seconds to a couple of hours and usually just resets itself under normal driving.

[Tannaton]

Originally Posted by Pezzyk

Thia is the thing that had them at volvo scratching their heads, as they plugged it into their system (vida) and it wasnt bringing any fault codes or messages up. The only message on the dash was engine system service required along with the yellow (i) in the middle of the dash (same light as when a bulb goes out etc) not actually the engine management light
This is why they are assuming the pressure switch on the pump. I was hoping they wouldnplug it in and be able to pinpoint the problem but they couldnt with no codes etc.

I just find it all frustrating as the car drives faultless apart from a hummung noise when you go over 40, think that is cheap tyers though, unless you accelerate hard which sometimes is needed then it has a hissy fit and cuts all power to which inthen look an idiot after trying to get past someone i am then crawling until it rectifies itself. It can last anything from being in limp mode for 10 seconds to a couple of hours and usually just resets itself under normal driving.

If your Volvo indie knows his stuff with VIDA it can track live, real time data as the car is being driven and compare actual values with commanded - i.e. fuel pressure, boost pressure, etc. I know it's easy for me to say having not had hands on the car but they are usually easy to diagnose (with the right kit and brain...)

[padder1956]

if you need a fuel pump i have a new one and a second hand one
cheers paul

[Bloders2]

even some more "affordable" code readers can log live fuel pressure.
As this seems to be suspect, id get one if you havent got one and take the car for a drive and log H fuel pressure under normal and fault conditions.
If after you ease of the power and the car is in limp mode, there should remain an issue with the HP fuel pressure until it drops out of limp.
It is feasable it is a sticking fuel pressure regulator.
I tend not to think it is turbo related as you would not get the diesel knock sound you mention. Turbo issues would result in loss of power (due to loss in boost or limp because of overboost) with no other abnormal sounds.
edit.
and if it appears to be the part of the HP pump i agree, id get a secondhand pump and swap just the one part, assuming you cannot get the part from motor factors, which is certainly worth trying.

[Vfifty]

Originally Posted by Pezzyk

Hi guys new to this site,
Got myself a little issue.
I have a 2006 v50 2.0d e4 se sport,
After buying the car i decided i would stick my foot down to see what she would do.
Big mistake of mine
I booted it through 1st and then right through 2nd but as soon as the car came to around 3500-4000rpm (harsh acceleration) it put itself into safe mode and started to overfuel like crazy (knocking it head off like a black cab) and this in turn threw up the engine system service required light.
This obviously limited the cars power
After turning it off for a few minutes and starting it back up everything was back to normal and the car had full power again.
Took it to a local volvo specialist and they plugged it in to find no fault codes stored (this being after we got the car into limp mode again simply by flooring it)
After this a chap came from in the back and heard the car overfueling and knocking away and he proceeded to state that it was the fuel pressure switch under the pump. But to fix i needed to buy a new pump at around 800 without labour to fit as the switch doesnt come separately. When asked would this fix the problem he said well it ahould but cant guarentee it.
Also i may add that under gradual acceleration the car just pulls and pulls through each and every gear the issue is only under fast acceleration
Has anyone else had this problem with theirs? Or anyone know if this sounds right just dont want to pay out aload of money when it may not resolve the issue.
Thanks

Hi, did you check all hose/pipe connections in case they were disconnected during fast acceleration ? As an option, could be simple thing to check to ensure no vacuum hoses got loose or disconnected. Though this might require sort of a ramp to see all hoses coming from turbo etc. Have just had similar problem, car stalled at junction complete power loss for 30 sec. investigation ongoing...