B6 - Exhaust Manifold Restriction

^ Remove the exhaust manifold(s). Inspect the ports for casting flash by dropping a length of chain into each port.

NOTE: Do not use a wire or lamp to check ports. The restriction may be large enough for them to pass through but small enough to cause excessive back pressure at high engine rpm.

^ Is a restriction present?

YES -- Remove casting flash. If flash cannot be removed, replace exhaust manifold(s).

NO -- Refer to lack of power. SEE Powertrain Management / Testing and Inspection / Diagnostic Routines / Lack of Power.