Results 1 to 5 of 5
-
11 July 2020 #1
- Join Date
- 31 Jan 2020
- Location
- Byron, MN
- Posts
- 20
- Saab(s)
- 2006 9-5 Aero Wagon
High Crankcase Pressure
I posted this in my intro thread, but thought I’d make a separate post to try and figure this out. I found out I have pretty high crankcase pressure after chasing a bunch of oil leaks for months:
https://youtu.be/re0UeI7A2oc
So I took it to a shop in Iowa that is Saab specific, and they told me that the pressure was “completely normal” and that I shouldn’t believe everything I see on the internet. They just wanted to replace the head gasket to stop the leak there; though I’ve had no mixing of gas/oil and no overheating issues whatsoever. My thinking (correct me if I’m wrong) is that fixing the leak at the head gasket will just seal the engine up even tighter and the pressure will just wreak havoc elsewhere. Should I really not be concerned with that much positive crank pressure?
-
12 July 2020 #2
- Join Date
- 24 Oct 2019
- Location
- Collierville TN
- Posts
- 48
- Saab(s)
- 2007 Saab 9-5 Aero Sportcombi
High Crankcase Pressure
There is a check valve near the throttle body that fails and will cause oil leaks. About the size of an American quarter in diameter. I’d replace that and redo the valve cover gasket/cam seals (if needed)and you should be good to go.
-
12 July 2020 #3
- Join Date
- 31 Jan 2020
- Location
- Byron, MN
- Posts
- 20
- Saab(s)
- 2006 9-5 Aero Wagon
I’ve actually done all that. I replaced the entire PCV system, including that check valve. There’s a chance the valve was bad from the factory, but I’m not 100% sure how to check it because it’s apparently epoxied to the hard plastic hose that I replaced. I could completely disconnect the hose, just a bit of a pain since one end is connected to the oil trap on the back of the motor.
-
13 July 2020 #4
- Join Date
- 31 Jan 2020
- Location
- Byron, MN
- Posts
- 20
- Saab(s)
- 2006 9-5 Aero Wagon
If someone could perform a similar test with their (healthy/non-leaking) car to either confirm or debunk the fact that it’s normal to have this much crank pressure, I would love that. Forgot to mention it’s a 2006 9-5 wagon with the 2.3T engine.
-
14 July 2020 #5
- Join Date
- 24 Oct 2019
- Location
- Collierville TN
- Posts
- 48
- Saab(s)
- 2007 Saab 9-5 Aero Sportcombi
If it is a head gasket the leaks won’t get worse. Combustion pressure is pressurizing your crankcase if it is leaking.
Doing a compression test will verify that. You can buy a compression tester on amazon or HF and try it yourself. Just pull the fuel pump relay and crank the engine over.
Similar Threads
-
Crankcase ventilation kit - PCV #6 - Saab 9-5
By SaabWorld in forum Tutorials, repairs and serviceReplies: 14Last Post: 17 May 2019, 02:25 -
Oil Trap Hose Crankcase Connector Broke Off
By Queen in forum Saab 9-5 (1998-2009)Replies: 2Last Post: 15 May 2019, 12:48 -
My car has high idle 1/min
By bobimihi in forum Saab 9-5 (1998-2009)Replies: 1Last Post: 31 October 2015, 15:29 -
High Idle
By walawala in forum Saab 9-5 (1998-2009)Replies: 5Last Post: 24 March 2013, 13:49 -
high voltage on I bus (+) and I bus (-)
By blackls1ttop in forum Saab 9-5 (1998-2009)Replies: 1Last Post: 13 June 2012, 23:00