Symptom Checks
WARNING: This page is about a different variant/trim than selected.
A snap noise may be due to secondary ignition arcing. On Coil On Plug (COP) models, check condition of spark plug boots. On all other models, check secondary ignition system. Go to TEST JB, step 1) under SYSTEM TESTS in SELF-DIAGNOSTICS - EEC-V - GASOLINE & NGV article.