had an old 740 wagon
used to perform "rattle test" w/oil fill cap to check for negative crankcase pressure
will that still work on v70?
where is flame trap located?

 

Turbo or non?

 

non turbo

 

Also depending on the year. The 1998 has the flame sheild in the induction hose just before the throttle body.
The newer cars don't have a flame sheild. Most just have a Bango fitting on the bottom of the intake that the small hose clogs on causing excess pressure. But I have also seen the vent box clogged up fully alot of times.

The cap test might or might not work. If it is clogged with it running you can pull the dipstick and hear it release.
Sometimes you need to give it a little gas first then pull the dipstick.

 

thanx 4 reply
wife's car is 1999 v70
i guess there are differences between the two?
mine is more like the 850?

 

Yes yours is exactly like the 850.