Engine: 3.2: 06 3.2 XC90 Codes P0087, P0172 and P0175

[jamesholley]

Hello all

I need some assistance in working out what could be causing these codes to be thrown up.

I first saw them on Christmas Eve, no issues felt with the engine.

But my code reader confirmed

p0087 fuel rail/system pressure
p0175 system too rich bank 2
p0172 system too rich bank 1

I cleared the codes down, but four weeks later the CEL has come back on and I suspect that the issue has re-occurred.

The engine is seeming to make a two tone noise when I drive it, but it doesn't feel sluggish and appears still responsive.

Any help or suggestions on what to check would be greatly appreciated.

I have just moved house at great expense, so would prefer not to have a trip to the local garage.

Thanks




James

[SwissXC90]

Look carefully at the intake system for air leaks, especially from Turbo to the intercooler

Split pipe, cracks, failed seals, etc.
May also be a leaking intercooler.

Any leaks past the MAF result in too rich a mixture due to too much unmetered air.

if you have a split pipe or a crack, you can make a temporary repair with some duct tape.... but make sure you replace any broken part you find.

[jamesholley]

Hi all

I have been back from the local garage and they diagnosed a faulty fuel pressure sensor.

So they removed and cleaned the fuel rail and replaced the pressure sensor.

They handed the car back as fixed and so far so good, the CEL has not come back on in two days.

However, the engine in low revs still sounds like it is chugging. So for me, in my mind, I don't see a change.

I don't ever recall the engine sounding o rough. I suppose i am putting this issue in with the CEL codes, or it could just be a separate issue.

Any thoughts other than going back to the garage and spending more money?

Thanks



James

[trumpetdropper]

It might be worth checking the oxygen (O2) sensors if its running rich as indicated this will potentially choke the fuelling making it chug at low revs, but fly on full throttle.
As with all things Volvo, buying good branded or O/E is far better in the long run.
(my old MR2 used to eat O2 sensors and the cheap ones wouldn't last a week)
Sometimes you can clean up the old ones, take them out carefully as they don't like to be knocked about and spray them with carb or brake cleaner and when dried out refit with a little copper grease.

[jamesholley]

Thanks, I have a code reader so will see what it records for the o2 sensor.

I will do some homework on how easy it is to access and clean up.

[jamesholley]

Well I have tried to shift the one reasonably accessible o2 sensor on the car (3.2 petrol) and it is not budging.

I used a WD40 Penetrating spray, 2 or 3 times over the weekend and had a couple of different o2 sensor tools connected to a 15 cm socket and then a longer torque wrench....NO GO.

I have a breaker bar coming today in the post, which might improve the leverage a bit, but are there any other tips that you all may have to get the f*cker loose?