Boost Leaks

[Jacek]

Can a boost leak cause knock when you are driving in vacuum.

[TheBlizzard]

Is the car misfiring at all? If its misfiring it could cause the car to think its knocking but I wouldn't be worried about it actually knocking. Could be just vibration from misfiring.

CRAIG

[Jacek]

30-40 counts from 2500-3000 rpm. no misfiring. timing is anywhere from 30 degrees to 20 at higher knock. my o2 trim is running 95-105% in this area..

[Khadgar]

If it was a huge boost leak couldnt it be running really lean?

[Jacek]

my though would be rich.

[Khadgar]

No, ONLY if you are boostin will you be runing rich cause the metered air will be PUSHED out of the pipes, when you are in vacuum unmetered air is being PULLED through the leaks.

Or so I think

[Jacek]

makes sense

[Khadgar]

Im sure someone will let you borrow a wideband if you want.

[Jacek]

nobody has one down here where i am.

[Khadgar]

You in Iowa?