March 9, 20169 yr Hi, I've recently changed the up pipe on my04 wrx for a decat pipe removing the sensor. I've now noticed that the header box starts to bubble over.
March 9, 20169 yr Lid not on properly, not sealing or prv not working would be my guess! Sent from my iPhone using Tapatalk
March 9, 20169 yr Author Never touched it when working on car but have checked it since, looks ok. Would it have anything to do with the removal of sensor on up pipe?
March 9, 20169 yr How's the general engine temp ? If the decat upipe hasn't been mapped in it might be running a bit lean and therfore hotter If it's not broke .....upgrade it 😊
March 9, 20169 yr Shouldn't do really, it's a sealed system, so should hold the pressure to a set rating and then the prv will open to release excess pressure. Is it definitely the cap and not from one of the hoses to it? Sent from my iPhone using Tapatalk
March 9, 20169 yr Author Temp is as normal. The up pipe is new and resistor fitted to bypass sensor, and warning light reset.
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