Nancy Rowlett John Streeter

Asked by Jul 24, 2016 at 03:03 AM about the 1999 Pontiac Bonneville 4 Dr SSEi Supercharged Sedan

Question type: Maintenance & Repair

Had plugs and wire changed autozone said
there machine said plug #3 is  misfireing its
clearly not that is it an vacuum leak eugine
light stay on then going up inclines it bogs
the light flashs

2 Answers


Connect a vacuum gauge to direct intake vacuum 19-21Hgin Ok, And flashing engine light indicates SEVERE engine misfiring

1 out of 1 people think this is helpful.

Sounds like the spark plug or spark plug wire for cylinder number 3 is breaking down under load. A flashing check engine or service engine soon light means that the engine IS misfiring and the catalytic converter is being damaged. HTH. -Jim

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