My Bravada has a missfire, it runs fine when cold, only starts when the engine is fully warmed up--but not every time. Once the engine is warm, the miss comes and goes as though by the flip of a switch. It feels like a regular, recurring miss on one cylinder, sometimes two.
Scanned codes are rear O2 sensor inactivity (the one after the cat) and Intermittent Missfire. I replaced the O2 sensor, cleared codes and the code came right back. Backprobe of the O2 sensor harness shows voltage in proper range, and definitely not inactive.
Trying to chase down the miss, I've replaced the spark plugs, plug wires, rotor (cap appears to be new) and coil. Also I used a soda-can to block off EGR, none of these made any difference.
Scanned codes are rear O2 sensor inactivity (the one after the cat) and Intermittent Missfire. I replaced the O2 sensor, cleared codes and the code came right back. Backprobe of the O2 sensor harness shows voltage in proper range, and definitely not inactive.
Trying to chase down the miss, I've replaced the spark plugs, plug wires, rotor (cap appears to be new) and coil. Also I used a soda-can to block off EGR, none of these made any difference.
Mar 6, 2010 at 7:44 AM