I have spark, fuel, power, both coils test good, starter tests good and it turns but just won't fire. The car is not modified except a downpipe-back exhaust. Any help here would be greatly appreciated.

 

it might be flooded.

 

I agree, the S4s flood like crazy. Check the FAQ for the unflooding proceedure. If it starts with that proceedure, you will have similar problems in the future as well. Lotsa different reasons for it.

Check that first, I'd bet money thats it.

 

you can try pulling your car by another vehicle with 3rd or 4th gear. make sure use a good strap. pull until it reach around 30kmh then release clutch, drag the car for 5oo meter. i`m sure it will start if your motor is still good. email me if any prob. rafaerx7@yahoo.com.sg