[Number1]

Just had the oil changed on my 03 "S" and they did an ECU upgrade -- 39.1
Anyone else had it done?

I find the idle a bit higher, pickup and accel feels stronger

They also did something to the PCV -- not sure of the implications.

 

[CoryB]

The PCV hose was replaced because the original one was getting soft and collapsing causing bizarre whistling noises to come from the engine.

The v.39 update is for an emissions sensor glitch of some sort.

 

[Cooper_si]

fink ive got that noise coming from mine ! i love this forum for good info !