2.4D (2005 on) 07 D5 Limp Mode Help

[Cliddoris]

Hey,

Yesterday I finally got Vida set up as I wanted to start getting to the bottom of the strange behaviour with my car.

Basically car is Euro 4 2.4D V70, 127k miles on the clock.

I've owned the car just a little over a year and this issue cropped up around 6-7month ago, but it has only got the the stage where I can pretty much get the car to go into limp mode on demand.

Sometimes when limp mode is triggered I lose all boost entirely for the rest of my journey until i restart the car, others i have zero boost but if i let up and ease back into the trottle it returns.

I'll hopefully attach a few pictures of pulls I done earlier in the hopes of getting to the bottom of it.

I've uploaded the codes present, ignore the SAS and air quality sensor, they shouldn't be much of an issue. SAS comes and goes and the car behaves exactly the same regardless of it's presence.

The first pull felt smooth but it's obvious that the actual MAF reading is lagging behind the desired reading, eventually catching up (Probabl why no limp mode was triggered.

2nd pull, i read the desired boost, actual boost and boost actuator, similar story. Lags behind what is expected but eventually catches up (No Limp mode)

The last pull, same boost/turbo readings but this time I started a bit lower in the rev range and the actual boost consistantly lags behind the desired boost, I had the windows down and I could audibly hear the turbo go from a quiet whistle to nothing (Thats the sharp drop is actuator value and boost.

I have recently had a cylinder 5 misfire recorded on the DTCs, i ran the injector test on vida and inspected the wiring and it allcame out fine, i would imagine that the misfire is likely caused by whatever is causing the boost issue.

So that brings me to, would a small boost leak likely cause this? I can't hear any blowing and the car is capable of achieving full boost.
Any other likely culprits i should look at or tests to perform?

Doesn't seem to be a sticking actuator as it appears to be capable of going through the full range of motion.

Just for further info the car is due another service but last service was about 4k miles ago and fuel filter was changed at that time as these issue were starting to come about but wasn't repeatable.
Fuel Filter wasn't genuine Volvo, it was a Mann as I was told they are the OEM replacement?

Cheers,

[5cilinder]

If you get a boostleak you get an airmass performance code
But if your airmass sensor is broken you also get limpmode due to a mismatch by other sensors who expect certain values by that airmass (boost,oxygen in exhaust).

Check the wiring and connector of the airmass sensor....and calibrate the sensor in vida under the ecm menu.... callibrate also the other sensors there present.
And check the swirlflap arm if its connected (affects airmass in part load)
If that not helps try a new airmass sensor.

What is a cliddoris btw?

[Cliddoris]

Originally Posted by 5cilinder

If you get a boostleak you get an airmass performance code
But if your airmass sensor is broken you also get limpmode due to a mismatch by other sensors who expect certain values by that airmass (boost,oxygen in exhaust).

Check the wiring and connector of the airmass sensor....and calibrate the sensor in vida under the ecm menu.... callibrate also the other sensors there present.
And check the swirlflap arm if its connected (affects airmass in part load)
If that not helps try a new airmass sensor.

What is a cliddoris btw?

So if it was a boost leak it would trigger a different code and not the one I'm seeing?

Swirl arm previously had fallen off, in a pinch I grabbed one from an XC90 from a breakers yard I passed the same day, my arm was completely worn and loose, where as the xc90 seemed a fair bit fresher and clipped in much stronger at both ends.

Possible the xc90's use a different length arm? I would expect a swirl flap related code of it was out of whack?

I'll disconnect the MAF tomorrow, give it a clean and check the wiring for breaks or rubs.

We don't talk about cliddorises.

[Simmy]

have you looked at the vac engine mounts for leaks?

[Lancee]

If there is a difference between the air mass desired and the actual air mass, could it be the EGR restricted ? Air needs to be able to get into the engine.

Perhaps a cleaning of same would be at worst a positive step and one in a process of elimination ?

Did you say the problem has become increasingly worse over a period of time ?

Perhaps look at an internet search for something like clogged EGR symptoms ?

[5cilinder]

Originally Posted by Cliddoris

So if it was a boost leak it would trigger a different code and not the one I'm seeing?

i got a different one with a boostleak It could detect it because of the lamda sonde
Yours hint at a hardware fault (try resistance measure it , value is also listed in vida)

Originally Posted by Cliddoris

Swirl arm previously had fallen off, in a pinch I grabbed one from an XC90 from a breakers yard I passed the same day, my arm was completely worn and loose, where as the xc90 seemed a fair bit fresher and clipped in much stronger at both ends.

Possible the xc90's use a different length arm? I would expect a swirl flap related code of it was out of whack?

Its all the same length with euro 4
And it callibrates itself after every fifth engine shutoff

Originally Posted by Cliddoris

I'll disconnect the MAF tomorrow, give it a clean and check the wiring for breaks or rubs.

And try callibrate it in vida under ecm tab (i suspect maf is broken)

Originally Posted by Cliddoris

We don't talk about cliddorises.

You started

[Cliddoris]

Originally Posted by Simmy

have you looked at the vac engine mounts for leaks?

Being a Euro 4, would a vac leak affect boost?
VNT is electronically actuated, but I know there is something EGR related which is operated via vacuum but I assumed it was only when cold.

Worth checking out though

[Cliddoris]

Originally Posted by Lancee

If there is a difference between the air mass desired and the actual air mass, could it be the EGR restricted ? Air needs to be able to get into the engine.

Perhaps a cleaning of same would be at worst a positive step and one in a process of elimination ?

Did you say the problem has become increasingly worse over a period of time ?

Perhaps look at an internet search for something like clogged EGR symptoms ?

I cleaned the EGR about 2 months ago, was very choked up.

Had little affect on the running of the car though.

Yeah the problem first popped it's head when I was towing a heavy load (1600kg) and lost all boost.

Was very sporadic since then, but it is now predictable and consistent.
If I'm doing short journeys it's not much of an issue, but on a long journey I tend to lose boost entirely.

I have noticed the EGR is sometimes static at 80.3% value and 17.5% position, but that's probably during a DPF regen?

[Cliddoris]

Originally Posted by 5cilinder

i got a different one with a boostleak It could detect it because of the lamda sonde
Yours hint at a hardware fault (try resistance measure it , value is also listed in vida)



Its all the same length with euro 4
And it callibrates itself after every fifth engine shutoff


And try callibrate it in vida under ecm tab (i suspect maf is broken)



You started

Hopefully the MAF isn't broke, they don't exactly seem to be cheap.

I'll give the connector a clean, sensor itself a clean and try to re-adapt it in Vida.

[Lancee]

I guess you could be grasping at straws somewhat. In this regard the following may not help.

However is it worth looking at the rubber air inlet charge pipe ?

I know it's relating to an earlier car (V70 D5 euro3) and your car may differ greatly, but the following happened to me.

The pipe collapsed (the rubber softens with age) when the suction/vacuum increased with load causing a restriction. When inspected the pipe had of course re-formed itself so visibly looked fine. In my case there was however a fluttering noise when the pipe collapsed and boost was lost.

It's the section on the right of the image.

As previously suggested also check the integrity of the vacuum circuit, although I suspect the turbo actuator on your later car may be electrically and not vacuum operated ?