C4 Upgrade Air Management to Improved Fuel Delivery - Got Air?

33 Among the modifications we hadto make was slightly crushing thecrankcase fresh air tube in order toclear the front intake runner andbolt boss on the passenger's side.

34 We had to perform similar "caressing"of the fresh air tube to clear the rearvalve cover bolt as well.

35 This shot of the left front of theengine shows the bracket that angles upand forward to support the A.I.R. pump. Wefound we had to grind the corner of the bosson the manifold for clearance for thisbracket, and also had to add several washersunder the bolt head because the tappedhole was too shallow to allow us to re-usethe original bolt.

36 In preparing the new throttlebody for installation, we first had totransfer the throttle position sensor(TPS), shown at the top, and the idleair control (IAC), shown at the bottom,to the new throttle body.

37 The A.I.R. pump bracket is also visiblein this photo, which shows installation ofthe new throttle body.