Multiple misfires 1,2and 3

[911monty]

Originally Posted by Walshie

Hi 911monty. Thanks for your reply. I have changed the bank 1 sensor, total bugger to get out, cleared the faults but now I have misfires on bank 2 cylinders 4,5 and 6. Is this likely as I have changed bank 1 sensor with a bosch and it is not matched to the original and has thrown that one out. Not really sure how these things work.

Hey Walshie: Did you disconnect the battery to reset the ECU? The learned values from bank 2 will still be stored and need to be reset. Disconnecting the battery will reset to base map.

[Walshie]

Originally Posted by 911monty

Hey Walshie: Did you disconnect the battery to reset the ECU? The learned values from bank 2 will still be stored and need to be reset. Disconnecting the battery will reset to base map.

Hi 911 monty
No I didn't disconnect the battery. Will this have caused any harm. If it's not too late, how long should I disconnect for.

[911monty]

Originally Posted by Walshie

Hi 911 monty
No I didn't disconnect the battery. Will this have caused any harm. If it's not too late, how long should I disconnect for.

No harm. Takes about 5 minutes for residual voltage to drop off.

[Walshie]

Originally Posted by 911monty

No harm. Takes about 5 minutes for residual voltage to drop off.

Thanks, job for tomorrow.. Will post results. Thanks again

[Walshie]

Originally Posted by 911monty

No harm. Takes about 5 minutes for residual voltage to drop off.

Battery disconnected and left for 20 mains. When started I had no cel but tick over was still rough. It was like this for bank 1 before I had cel. I have ordered another matching oxygen sensor. Hopefully all will be good after this. If not then I will look elsewhere for the cause.

[Jamesp]

A bad O2 sensor should throw a bad O2 sensor code. Additional codes are thrown for trying to control too rich or too lean. I had misfire codes when the electrical connector fell off my variocam and the engine ran scary rough at times. I do have a different DME than you, but all the same I'd look seriously at the variocam.

[Walshie]

Originally Posted by Jamesp

A bad O2 sensor should throw a bad O2 sensor code. Additional codes are thrown for trying to control too rich or too lean. I had misfire codes when the electrical connector fell off my variocam and the engine ran scary rough at times. I do have a different DME than you, but all the same I'd look seriously at the variocam.

Hi jamesp
I have ordered another matching oxygen sensor. This weekends job and have booked in with Porsche for a diagnostic test and check over as they fitted the variocam solenoid. This is being done next Friday
I will post results.
Thanks for your help