EA888.3 1.8T Stage 1 tune - Misfires & EPC light
I recently tuned my 2018 MK7.5 Golf S (EA888.3 1.8T, AISIN auto) with EQT stage 1. (93 octane)
The tune works great for the most part and makes the car feel like a completely different vehicle. Unfortunately, I’m having some issues.
I first tuned with no modifications to the ignition system; plain old bosch plugs and the coils from the factory. (65k miles) I first noticed issues when putting the car in sport mode and flooring it from a ~20mph roll. the RPMs shot up to around 4500 and then the EPC light came on. I got random/multiple misfire and cylinder hide. Restarting the engine solves the problem immediately.
I decided it would be a good idea to get some new plugs and coils anyway, since they’re already getting old. I bought Eldor coils and NGK 94712 plugs. Before installing the plugs i gapped them to around .022-.024.
Even after installing the new parts, I’m still having issues. I haven’t gotten any codes about low fuel rail pressure, only misfires and cylinder hide. This time the light came on at around 5000RPM, which is probably just margin of error. Again, this was in sport mode. D usually prevents this altogether since it shifts so early.
I’ve done some research and can’t seem to find any solid answers. Thanks in advance!