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Hi,

I had the ECU warning lamp illuminate on my B7 RS4 two months back.

Car ran fine, but ran VCDS which indicated a Cyl 4 misfire. Dealer confirmed that a coil pack intermittency was likely, so replaced under warranty.

Car just been to have DRC fixed (yet again) and dealer reported same error (Cyl 4) and has replaced the 'new' pack with another new one.

And before anyone asks, the error WAS cleared when Audi mobile tech changed coil pack - i watched him do it and run a 100% clear 5051 log.

I can't believe two dud in 2 months on same cylinder (and in neither case was any misfire evident).

Any thoughts on what else could cause this?

Below is my error log - I obviously don't have the dealer's from today but i assume report is same.
_______
000768 - Random/Multiple Cylinder Misfire Detected
P0300 - 001 - Upper Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 2
Mileage: 28328 km
Time Indication: 0

Freeze Frame:
RPM: 1581 /min
Load: 54.5 %
Speed: 2.0 km/h
Temperature: 25.0°C
Temperature: 25.0°C
Absolute Pres.: 990.0 mbar
Voltage: 12.700 V

000772 - Cylinder 4: Misfire Detected
P0304 - 001 - Upper Limit Exceeded - MIL ON
Freeze Frame:
Fault Status: 11100001
Fault Priority: 0
Fault Frequency: 2
Mileage: 28328 km
Time Indication: 0

Freeze Frame:
RPM: 1581 /min
Load: 54.5 %
Speed: 2.0 km/h
Temperature: 25.0°C
Temperature: 25.0°C
Absolute Pres.: 990.0 mbar
Voltage: 12.700 V
_____

Thanks guys!

did he check the wiring to the coilpack?

i doubt it...

Is there a problem with the spark plug which is allowing the coilpack to overheat and fail?

I suppose an excessive gap could overload the coilpack?

Given i probably average twice the 'average' driver's rpm, then i'm putting in twice the wear...

Which has prompted me to start another thread...