Surface Distortion

Check the surface distortion of exhaust manifold and three way catalyst assembly mating surface with straightedge and feeler gauge.

Fig 1: Checking Surface Distortion Of Exhaust Manifold
Courtesy of SUZUKI OF AMERICA CORP.

Limit: 0.3 mm (0.012 in)
If it exceeds the limit, replace exhaust manifold and three way catalyst assembly.