HELP!!! 1.8TFSI Misfire at 1600rpm When Cold

[AudiTurbo8]

Hi guys,

I have a 1.8TFSI 61 plate A3 with 60k miles. it's got FASH and has a stage 1 Revo remap. for a while it's had a problem where until it reaches 90deg, it'll hesitate at 1600rpm in every gear, and it'll carry on very faintly for the first few minutes even at that temperature. I've had it plugged into VCDS and it didn't show any faults, and there was nothing immediately obvious when data logging. One thing that was a little concerning was that the ignition timing was quite erratic at idle within about a 10deg range, but I wasn't sure if this was normal or not...?

So far I've changed fuel filter, spark plugs (made no difference), injectors (seemed to make a slight improvement), coil packs (seemed to make a slight improvement), recirc valve on the turbo, had a carbon clean done and then also manually cleaned intake valves. I'm now wondering if it could be the camshaft sensor? really running out of ideas for what this could be, so any advice would be greatly appreciated! I'm doing all the work myself so it's only the cost of parts (hence why I'm throwing parts at it instead of going to a specialist).

Thanks in advance,
Jamie

 

[Emzy93]

Ask the tuner that flashed your ecu, could be a fault in the revo software.

 

[Dikonou]

Basic setting on throttle body?

 

[AudiTurbo8]

I've asked Revo twice, they say it's 100% not the remap since they've installed exactly the same remap on 1000s of cars without fault, which to me sounds like a fair point, but then again I don't know much about the remapping process so maybe it is possible?

 

[leshkin]

Is the misfire occurring on the same or multiple cylinders?

From the sounds of it, you've covered most of the basic stuff I'd look at and more I would say that you're getting to a point where you might need to admit defeat and pay a visit to a specialist as you are doing diagnostics the expensive way and it will only get more expensive as you keep replacing parts that are not faulty.

 

[AudiTurbo8]

Hi leshkin thanks for your reply. Not sure I think it's misfiring on all cylinders, but it's intermittent and doesn't do it all the time.

Starting to feel like I will have to do as you and admit defeat