2004 S60 T Exhaust Pulsing at Idle, misfiring erratically around 0.3Hz

[Georgeandkira]

Here's where an affordable (cheaper) code reader can speed things along. A misfiring coil will generate a P0300 through P0305 code.
The 300 would mean "random misfire'. 301-305 would point to misfires in cylinders 1-5 respectively.
I'd bet buying (or borrowing) a cheap reader would be less costly than asking professors to swap electronic parts for tests.

You bought this car with 150Kkm on the odo. Do you have any idea how well cared for the car was? 150Kkm of local driving on conventional oil (possibly neglected) can contribute to dirt "all over the place".

For example, my dear Mom's locally driven turbo would sputter and poop about. I'd take it out for a highway run and it'd cure itself.

Have you ever used any fuel system cleaner like Techron in it? Fuel injectors can clog.

Another indirect indicator of dirt is the throttle body. They can get foul. You can clean them quickly without a lot of tools.
You'd then be able to see if your forced air pipes (the compressed air to the engine) are filled with oil.

Finding a bad coil would be ideal but looking at things and cleaning as you go will help tell the whole story. Get a reader, mate.

[gerruta]

Does the glove inflate or just stay limp?

If it inflates, you should use the interim catch can solution until you can fix it, so you don’t blow seals

Cam seals 100 EU
Main engine seal. 1000 EU

Just as an update for that, I actually went on and changed the whole PCV system. It's running like it never has. The thing was a pain to do, but the glove was inflating, and I said to myself that I was not going to bring this car to the Mechanic anymore. I'd try to fix it myself from now on and when it finally broke to the point I couldn't do it, I'd leave it forever. I love this car, and don't want it to die, but it can get expensive!

So yeah, I changed the whole PCV system thanks to some videos by FCP euro and others, and it's running great now! It leaks a bit of oil though, not much, but unfortunately I'll have to look into that another time. It most likely is due to the PCV being clogged for some time...