Valve Springs
WARNING: This page is about a different car, the 1991 Suzuki Swift, 1991 Suzuki Sidekick, and 1991 Suzuki Samurai. However, it is still accessible from the selected car via links, so may be relevant.
Check valve springs for damage. Use a square and flat surface plate to check spring squareness. Maximum out-of-square is .079" (2.00 mm). Using valve spring tester, check valve spring preload pressure. See VALVES & VALVE SPRINGS table under ENGINE SPECIFICATIONS. Replace any weak springs.