I need to check for leakage in my intake system. The "Volvo" way of doing it, according to VADIS, is to use positive pressure in the system and soap solution to look for air leaks. I know that carb cleaner and propane can be used in a similar manner, but I like the idea of not having the car running while checking pressure...less background noise to listen for hissing sounds. Any suggestions for rigging a homemade solution of putting positive pressure in the system?

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https://volvoforums.com/m_97871/tm.htm
I made this and use it to find leaks.

 

Nice rig! I don't have one of those caps you used from a new intake hose...have you any ideas for an alternative that I could find around the house or perhaps at the hardware store?

Also, since I replaced the seals on my injectors, is there a way to use your tool to test for leaks along the rail?

 

The tool will pressurize the intake system and crankcase system.
Maybe a pvc cap will work. I haven't tried but there might be one close to the sized you need.

 

ah, PVC cap in the plumbing section...I'll have to take the hose into Lowe's and check that out...thanks for the idea!

 

No problem let me know how you make out.

 

tech...I've got quite a bit of air flowing out of the oil fill hole...are you still able to pressurize the engine to 3 or 4 psi with the leaking air? I don't want to push it and blow a seal out.

edit...or it could be that I just forgot to clamp off the PCV hose and air is venting straight from the flame trap through the engine block and out the oil cap...doh!

 

You don't need to pinch off any lines.
I stick a rag between the oil cap and the cam cover. Then test yes you can still find a leak that way.

 

Your engine will actually hold air enough to build 3-4 psi with just the rag filling the hole?

Too much air is coming out of the oil hole on my car...can't build any pressure

 

It should still hold some pressure. It is going through everything still try spraying everything with soapy water.