Inlet pipe Volvo 740 (B200F/G/B230F/G)

Rough idle, hissing air leaks and an unsteady cold start often begin at the inlet manifold, where a dry gasket or a crack in a seal ring lets in unmetered air. On the B200F (1,986 cc) and B230F (2,316 cc) the manifold sits tight against the manifold side, and the gasket faces and studs in particular are classic checkpoints when the intake is taken apart.