ZF 8 speed auto transmission in 2015 Audi Allroad

[MasterTommy]

You are correct. The fluid level was verified at 32 degrees centigrade not fahrenheit.

And after running through the gears, with the fluid temperature still between 35 and 45ºC, the transmission fluid was topped up a final time while the engine was running?

Really, if the final filling was not done, or it was done with the engine off and/or the fluid temperature not between 35 and 45ºC, you have not excluded the transmission as a cause. Oh and as others said, with the correct fluid.

 

[runsub5]

Thank you all for the great advice. Will let you know when and if I get this problem solved.

 

[runsub5]

I have diagnosed the problem as engine misfires. I was not getting any fault codes using auto scan and the misfires totally disappear when the engine reach's operating temperature. I have installed new coil packs and plugs. My feeling is that it is probably a carbon issue with the intake valves. Now to figure out how best to remove carbon.

Monday,10,March,2025,16:41:47:11321
VCDS -- Windows Based VAG/VAS Emulator Running on Windows 11 x64
VCDS Version: 25.3.0.3 (x64)
Data version: 20250301 DS365.0
www.Ross-Tech.com


VIN: WA1UFAFL1FA101407   License Plate: 6623M
Mileage: 61608   Repair Order:



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                Address 01: Engine  (8K5 907 115 N)

16:40:36
  IDE00021   Engine speed 699 /min
  IDE01773   Misfire totalizer 0
  IDE01975   Numb.of misfir.: cylinder 1 9707
  IDE01976   Numb.of misfir.: cylinder 2 1195
  IDE01977   Numb.of misfir.: cylinder 3 772
  IDE01978   Numb.of misfir.: cylinder 4 8726

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[EuroX]

If its only cold start misfires I would say it's carbon. If you have faults set cold start misfire is considered when the coolant temp is below 30 degrees C. Walnut blast carbon or dissolve the chemical way. In either case you need to be very careful.

 

[runsub5]

........Walnut blast carbon or dissolve the chemical way. In either case you need to be very careful.

Is there any way to remove carbon without physically removing intake manifold? What about injecting a chemical into the air intake or using the air temperature port as in injection port while the engine is running. Have you had any experiences with these techniques?

 

[Uwe]

Is there any way to remove carbon without physically removing intake manifold?

A way that's actually effective? I don't think so.

-Uwe-

 

[EuroX]

Is there any way to remove carbon without physically removing intake manifold? What about injecting a chemical into the air intake or using the air temperature port as in injection port while the engine is running. Have you had any experiences with these techniques?

Nope pull the intake.

 

[davisev5225]

A way that's actually effective? I don't think so.

-Uwe-

CRC's DI intake cleaner is usually good for going from "marginally bad" to "marginally functional", but I agree that there's no substitute for removing the intake and physically removing the carbon. The CRC product basically just removes the surface layer, which is a temporary "fix" at best.

 

[runsub5]

CRC's DI intake cleaner is usually good for going from "marginally bad" to "marginally functional", but I agree that there's no substitute for removing the intake and physically removing the carbon. The CRC product basically just removes the surface layer, which is a temporary "fix" at best.

Thank you. Not what I wanted to hear. A very labor intensive job.

 

[davisev5225]

Thank you. Not what I wanted to hear. A very labor intensive job.

There's no replacement for elbow grease.