Valve Spring: Squareness

WARNING: This page is about a different car, the 2004 Nissan Sentra. However, it is still accessible from the selected car via links, so may be relevant.

Measure dimension "S".
1. Out-of-square "S" : Less than 1.75 mm (0.0689 in)
Fig 1: Measuring Valve Spring Dimension (Out-Of-Square)
Courtesy of NISSAN MOTOR CO., U.S.A.
If it exceeds the limit, replace the spring.