For 1990-2009 cars only
| • | Loose or broken crankshaft balancer or drive pulleys. Tighten or replace as necessary. |
| • | Excessive piston to bore clearance. Replace the piston. |
| • | Cold engine knock usually disappears when the specific cylinder secondary ignition circuit is grounded out. Cold engine piston knock which disappears in 1.5 minutes should be considered acceptable. |
