1996 Pontiac Bonneville Q&A
1996 Pontiac Bonneville Question: Why is engine miss firing only on cylinder 3 and causing engine light to flash.
you may have damage in threading for plug(crossthread maybe). - arturo08
All for #3!! Check for cracked spark plug porcelain insulator may have cracked on install, check compression, check for injector pulse with noid light, check for vacuum leak and kv @ plug wire. POSSIBLE ignition module circuit, kv test should reveal any spark problem! If kv tester not available, spark should jump a 1 inch gap on this system!! Can use phillips screwdriver in plug boot, just dont get near the shank. Also can use long screwdriver placed onto injector put ear to handle and listen for injector clicking to confirm pulse, if no noid light. Need compression tester! One of these test will reveal the problem. - pushrod