Sage0908

Hello gents first timer here & have a problem that maybe someone can shine some light on
I have an 3.0 s5 2010 that’s got misfires on 4,5 & 6 epc light & cel light are on
has had new coil packs & spark plugs & injectors also a new pcv
fuel pressure is fine as is the timing & compression. & has been smoke tested a couple of times & no leaks have been found
has had new o2 sensors as the misfires destroyed the cat which led to a cat delete & remap to take out the rear sensors
next step is to send the ecu away for testing as it took about 45 mins to put the map on
other than that I’ve no idea what it could be
any help would be gratefully received.

TTA365

I know nothing, but saw this other post which may or may not be correct or have any value but thought I would share, as I wonder if a sensor is malfunctioning and causing misfires. This dude wrote about your motor in response to essentially where is the MAF sensor:

The is not located in the or intake tube going from the box to the supercharger. That is why we can swap intakes (Roc*Euro, AWE, etc) without changing around the sensor. The sensor(s) are connected to the supercharger module. Per the tech manual:
Sensors for the measurement of air mass and charge pressure
Air mass and charge pressure are two factors used
for engine load management. For this purpose, there are three sensors with absolutely identical functions. They measure the intake air temperature and the . The first sender unit is located upstream of the throttle valve control module J338 and contains the following senders:
– Intake air temperature sensor G42
– Manifold absolute pressure sensor G71
The other identical senders are integrated in the supercharger module. They measure the pressure and temperature of the air in each individual cylinder bank. It is important that the measuring point be located downstream of the . The values measured here correspond to the actual air mass in the cylinder banks. The senders are as follows:
– Charge air sensor G31 (cylinder bank 1)
– Intake air temperature sensor G72 (cylinder bank 1)
– Charge air pressure sensor 2 G447 (cylinder bank 2)
– Intake air temperature sensor 2 G430 (cylinder bank 2)

Sage0908

That’s something I haven’t looked at being there was no codes pertaining to those sensors
plus I didn’t know that there was two one for each bank
thanks very much I shall check those out when I get my ecu back

Grisho

Hello, I woukd advise you to check the intake ports and around the valves for carbon buildup, as it may be causing the misfire as well. Let us know what turns out to be the real cause.