Cylinder 3 Misfire Detected P0303

[Cbklivevil]

Hi,

About a month ago I replaced my coil pack on my Zafira B 2007, solved issues but now these issues have arrived again. Changed spark plugs over but still issues.

Misfiring, shuddering.

If needed I have all the freeze frame info to help.

[Vauxhall Owners Club]

Have you checked the correct plug gaps as these can be instrumental in knocking out the coils

[Cbklivevil]

Hi, we checked them from the existing ones and looked the same although if all plugs weren't in the correct position wouldn't that put out all Cylinders and not just 3?

[Vauxhall Owners Club]

Easiest method would be to take the plugs out and see how they look, e.g. wet with fuel

The gaps and tightening torque is critical to avoid premature coil failure

[Cbklivevil]

So to further on the issues with the car.

Changed Coil Pack

Changed Spark Plugs (gaps exact)

Changed EGR Valve

Cleaned Throttle Body

Checked Wiring / replaced Coil Lead

Changed Lambda Sensor

When at a set speed it's fine but as soon as I put my pedal down it shudders and the Engine Management light starts flashing, once I take my pedal off it stops flashing but stays on.

Normally worse on lower gears.

Still same code - P03030 Cylinder Misfire #3

 

Any ideas where to go from here?

[Vauxhall Owners Club]

Is the coil pack a combined one (e.g. 4 coils on a rail) or are they individual coils?

Also, have a look at the wiring going to number 3 cylinder coil pack for damage