|
XC90 '02–'15 General Forum for the P2-platform XC90 model |
Information |
|
XC90 T6 - Oil Pressure Warning AdviceViews : 1647 Replies : 14Users Viewing This Thread : |
|
Thread Tools | Display Modes |
|
Jun 2nd, 2020, 10:48 | #1 |
Member
Last Online: May 29th, 2023 10:26
Join Date: Jul 2015
Location: London
|
XC90 T6 - Oil Pressure Warning Advice
Hello all - I am now the owner of a XC90 T6… I bought the car as a project and as such am looking towards the community for some guidance! I’m glad to be back in a Volvo, I nearly picked up an 850R recently but alas the price was too high…
Anyway, the car in question has the oil pressure warning coming on, along with the oil light. It apparently comes on only when the car is warm whilst driving for about 10-15mins – I have only had the car running and haven’t been able to drive yet as its not taxed/insured, as such I haven’t been able to get the warning to come up. There is plenty of oil, it runs fine, coolant looks clean, no excess smoke from exhaust and there's nothing else obvious presenting itself. I’ve done a fair amount of research about this through the forums and can see that its likely to be two things: 1) Faulty oil pressure sensor (best case scenario) 2) O rings gone on the oil pan 3) Sludge build up blocking the oil pick up 4) Actual low oil pressure due to worn engine Clearly, I’m hoping for option number one… I’ve bought an oil pressure gauge to check the actual readings on idle and at revs, that’s arriving soon so will shed some light on the sensor and give me a bit more info on the actual pressure readings. The second point seems like the most likely given the amount of posts about this issue, the only thing is that the previous owner apparently changed these around 25k miles so Its seems a little strange that they would fail so quickly unless they have moved or deteriorated rapidly. Third cause seems like it could be likely also, again it seems that dropping the oil pan is the only way to really check this, I did think of an engine flush but given the mileage (125k) I think it will just cause more issues than solve anything. The PCV system has apparently been changed but ill do the glove test hopefully tonight to see if there’s any pressure issues. anyway, I’m thinking it may be a blockage in the oil pick up which presents itself once the car is warm and then when shut off it settles hence the warning not coming on from the outset. Any thoughts? Fourth… I’m hoping this isn’t the case as I don’t fancy changing out an engine again (had a Nissan 180sx which went through 2 engines - buy cheap buy twice). I ran a compression test to get an idea of whether there’s anything going on internally and gained the following results (WOT, about 6-8 cranks, car was warm but as I said I can’t drive it so perhaps not as hot as it could be): 1 – 140 2 – 135 3 – 150 4 – 155 5 – 140 6 – 150 Seems quite low to me but fairly consistent. Could this be a case of carbon deposits and once the engine has some fully synthetic and a few oil changes I’ll see more pressure? Any thoughts on these results? I want to keep going with the car rather than just sell it on for spares but the phrase throwing good money after bad does come to mind… I’ve also looked into dropping the oil pan and despite searching numerous threads I can’t seem to find a good ‘how to’; some people say you need to drop the subframe on the passenger side, others than you can jack the engine up, others that you need to cut the subframe tabs, some very rare others seem to say it just comes out? Whilst I don’t mind getting under a car when it comes to subframes and unbolting them it makes me a bit uneasy… Has anyone done the work and could give me a few pointers? I guess when I’m under there it will make more sense but I’m not sure what needs to be removed/moved in order to gain access and don't want to randomly unbolt things ideally. Alternatively, do you think its better to bite the bullet and get a local independent to do the work? Thanks for any input and ill be sure it update this in due course with my journey as it really irritates me when you see a thread, they have the same issues, go through some fault finding and then just disappear with no outcome! Dom |
Jun 3rd, 2020, 08:50 | #2 |
Premier Member
Last Online: Mar 20th, 2024 18:26
Join Date: Jan 2016
Location: Cross Country
|
There's one other possible reason:
Wrong oil viscosity. If the oil is too thin you'll loose pressure when warm. So try an oil change (and oil filter change) with the correct oil.
__________________
XC90 R-Design MY2009, Black Sapphire Metallic. HP-Sound, RSE, Nav, Tel, ParkingCam, BLIS, ParkingHeater, RestHeat, Removable Towbar, Summer: CRATUS 20x8 on Pirelli Scorpion Zeros 255/45, Winter: NEPTUNE 17x7 on Continental WinterContact 4x4 235/65. |
Jun 3rd, 2020, 09:33 | #3 |
Member
Last Online: May 29th, 2023 10:26
Join Date: Jul 2015
Location: London
|
Thanks - I’ll give that a go after checking the pressure with a manual reader to make sure I don’t knacker the engine. I hadn’t thought of that though...
|
Jun 4th, 2020, 12:33 | #4 |
Member
Last Online: May 29th, 2023 10:26
Join Date: Jul 2015
Location: London
|
Any other thoughts on the compression and removing the oil pan process?
|
Jun 7th, 2020, 20:26 | #5 |
Member
Last Online: May 29th, 2023 10:26
Join Date: Jul 2015
Location: London
|
I checked the pcv system with the glove method and there was a vacuum as hoped for.
I put a mechanical oil pressure gauge on - pita to get to by the way, it’s a 22mm head which I managed to gain access to in-between the subframe and oil pan with a long spanner then removed the intercooler hose to gain access to it. Anyway Connected up the pressure gauge and from start up got a reading of 50psi, as it warmed up it went to 30psi, at 4000rpm it was around 80psi-90psi... so well with the Volvo min of 14.5psi for idle and 50.8psi at 4000rpm. I thought it was the sensor but then as engine warmed up the pressure slowly dropped to 20psi, when revved the pressure raised back up but on idle it just kept falling slowly until I switched it off at about 10psi. Any ideas??? |
Jun 9th, 2020, 11:36 | #6 |
Member
Last Online: May 29th, 2023 10:26
Join Date: Jul 2015
Location: London
|
Genuine Volvo filter and some fully synthetic oil has arrived so ill get it changed and see if that makes any difference...
Its quiet on here... Maybe my post was too long! |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|