Oil Pressure Issues
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Junior Member
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From: Norway
Oil Pressure Issues
S70 2000 AWD 2.5T
Sorry for problematic/lacking language, english is my second language.
A while back, whilst driving along the ****ryside where i live some rock must've popped up and slammed into my undercarriage or something. No visual damage as i assume it hit the chassie-pylons underneath, as there was one small bulk in it.
Later, after 10-20 min of driving the oil lamp starts flickering, as in blinking, and later remaining on/off for about a second or two. Letting the engine rest and cool down for a while helps. But temp gauge is completely normal.
Don't know what it might be, so I've done the following:
Dropped the oilpan and cleaned out the sump (lot of sludge, engine has gone about 330 000 KM / 205 000 Miles). Replaced all rubber rings and other stuff, as well as cleaning out everything else i could get to.
Replaced the oil pressure sensor.
It acted good for a couple of weeks, but now it is back. Problem still only appears after a 10-20 min while of driving.
The engine dosen't comsume nor leak oil.
The only patterns i thing the flickering has, is that it intensifies through high rpms, and higher loads. Keeping the clutch in seems to help somewhat to the flickering.
Really confused, and in need of help. Don't know what it might be, and hopes it dosent relate to the oil pump.
Sorry for problematic/lacking language, english is my second language.
A while back, whilst driving along the ****ryside where i live some rock must've popped up and slammed into my undercarriage or something. No visual damage as i assume it hit the chassie-pylons underneath, as there was one small bulk in it.
Later, after 10-20 min of driving the oil lamp starts flickering, as in blinking, and later remaining on/off for about a second or two. Letting the engine rest and cool down for a while helps. But temp gauge is completely normal.
Don't know what it might be, so I've done the following:
Dropped the oilpan and cleaned out the sump (lot of sludge, engine has gone about 330 000 KM / 205 000 Miles). Replaced all rubber rings and other stuff, as well as cleaning out everything else i could get to.
Replaced the oil pressure sensor.
It acted good for a couple of weeks, but now it is back. Problem still only appears after a 10-20 min while of driving.
The engine dosen't comsume nor leak oil.
The only patterns i thing the flickering has, is that it intensifies through high rpms, and higher loads. Keeping the clutch in seems to help somewhat to the flickering.
Really confused, and in need of help. Don't know what it might be, and hopes it dosent relate to the oil pump.
Super Moderator
Joined: Jan 2006
Posts: 2,564
Likes: 35
From: SW, WA
S70 2000 AWD 2.5T
Sorry for problematic/lacking language, english is my second language.
A while back, whilst driving along the ****ryside where i live some rock must've popped up and slammed into my undercarriage or something. No visual damage as i assume it hit the chassie-pylons underneath, as there was one small bulk in it.
Later, after 10-20 min of driving the oil lamp starts flickering, as in blinking, and later remaining on/off for about a second or two. Letting the engine rest and cool down for a while helps. But temp gauge is completely normal.
Don't know what it might be, so I've done the following:
Dropped the oilpan and cleaned out the sump (lot of sludge, engine has gone about 330 000 KM / 205 000 Miles). Replaced all rubber rings and other stuff, as well as cleaning out everything else i could get to.
Replaced the oil pressure sensor.
It acted good for a couple of weeks, but now it is back. Problem still only appears after a 10-20 min while of driving.
The engine dosen't comsume nor leak oil.
The only patterns i thing the flickering has, is that it intensifies through high rpms, and higher loads. Keeping the clutch in seems to help somewhat to the flickering.
Really confused, and in need of help. Don't know what it might be, and hopes it dosent relate to the oil pump.
Sorry for problematic/lacking language, english is my second language.
A while back, whilst driving along the ****ryside where i live some rock must've popped up and slammed into my undercarriage or something. No visual damage as i assume it hit the chassie-pylons underneath, as there was one small bulk in it.
Later, after 10-20 min of driving the oil lamp starts flickering, as in blinking, and later remaining on/off for about a second or two. Letting the engine rest and cool down for a while helps. But temp gauge is completely normal.
Don't know what it might be, so I've done the following:
Dropped the oilpan and cleaned out the sump (lot of sludge, engine has gone about 330 000 KM / 205 000 Miles). Replaced all rubber rings and other stuff, as well as cleaning out everything else i could get to.
Replaced the oil pressure sensor.
It acted good for a couple of weeks, but now it is back. Problem still only appears after a 10-20 min while of driving.
The engine dosen't comsume nor leak oil.
The only patterns i thing the flickering has, is that it intensifies through high rpms, and higher loads. Keeping the clutch in seems to help somewhat to the flickering.
Really confused, and in need of help. Don't know what it might be, and hopes it dosent relate to the oil pump.
Senior Member
Joined: Jul 2020
Posts: 5,104
Likes: 675
From: GA
It's not your oil pump.
You might want to make sure the pcv system, especially the oil separator box is clear - normally the passage draining back into the oil pan gets clogged (pan has to be off to clean it) and if the system gets clogged enough will blow out the cam seals, making a mess.
https://www.fcpeuro.com/products/vol...Lw_wcB#fitment
Super Moderator
Joined: Jan 2006
Posts: 2,564
Likes: 35
From: SW, WA
I was under the impression that the OP cleaned the oil pickup tube when the pan was dropped. That would be a logical thing to do in my mind. Anyway, if the pickup tube and screen were not cleaned out when the pan was dropped, then yes it could definitely be a cause of the issue. Once the pickup tube and screen are cleaned I would still suggest putting a gauge on it to see what the actual oil pressure is. Just my .02
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Joined: Jul 2020
Posts: 5,104
Likes: 675
From: GA
Yes, the first time my shop came across the low oil pressure at weird times problem, (after replacing a bad oil burning turbo with bad bushings in it) we cleaned everything including the pick up tube as best as possible. Low oil pressure at weird times still occurred after reassembly. Pulled oil pan again - orings were in the correct positions, we replaced oil pick tube with the new style tube and had no more oil warning light at weird times. From then on whenever solving that problem a new pickup tube was installed and did not have any more recurring oil light problems on those cars.
Last edited by hoonk; Mar 15, 2022 at 07:01 AM.
Thread Starter
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Junior Member
Joined: Mar 2022
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From: Norway
The tube was dismounted and washed with pressurized hot water and white spirits. Testing the pressure tomorrow, assuming the pump is the problem. As the problem arrives only with hot engine (and oil), I'd assume it is caused by a damaged pump not being able to lift the low viscosity of the oil when it is hot.
Senior Member
Joined: Jul 2020
Posts: 5,104
Likes: 675
From: GA
As before - It's not your oil pump. I have never replaced a bad oil pump in any engine (no "american" (gm/ford/crys) worked on) since 1972. And never in a Volvo at my specialty shop since 1980. So replace it if you wish, then find the real problem. Sorry for the attitude just trying the keep you from going down the wrong path.
You either have a suction leak on the orings or a partially clogged tube or both..
You either have a suction leak on the orings or a partially clogged tube or both..
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