Hello,

One common area to check is the vacuum elbow on the end of the intake (by the P/S pump). Some models have this, but the later models eliminated it and moved the hose to the throttle end of the intake. Make sure that the elbow is connected and intact. The hose itself runs from the intake to the PCV nipple in the fresh air hose (right near the turbo inlet). This hose can also coke up internally, leading to vacuum loss to the PCV system. Worst case scenario is to replace the entire PCV system (FCPGroton has the whole setup for $120 or so, depending on the year). Best case, you may have had ice in the PCV system (you mentioned very cold weather). This could explain the sudden onset of this problem also. Later models ('99 and up) have a heated PCV system to prevent icing, which proves that it can be a problem. Anyway, feel free to ask if there is anything else I can do.

Joe S.

2000 S70 AWD, 1995 850 Turbo, 1981 242 Turbo w/intercooler