Compressor bypass valve? Does it sound like air? It sounds like air being let out when I let off the gas pedal. When I accelerate the whining gets louder the more I press down on the gas pedal. It sounds like its inside the car and not in the engine. I have not noticed it much before I just happene...

Would someone explain what this could be? It makes the high pitch noise when really pushing down on the gas pedal and when I let off the gas after it sounds like its letting air out. Any input would be great!

i have a 99 s70 glt and i love it. as others have described it, death by 1000 paper cuts. everything major seems solid so if you can do minor repairs they seem to be great cars!

sounds good, i only want to do this once! kinda makes me sad i have to do it at all with only 80k miles...my care before was almost 20 years old and i never had to replace any hoses..if they can do it any car company should! side note after some searching i found a kit with silicone hoses but they a...

I am having the issue where the car dies and then drives fine..blah blah. i am sure its a hose and i am going to take everything apart and replace all the vacuum hoses. Is there a kit available or do I need to buy them individually? Where is the best place to get them? thanks

for a 98s70glt

charlyW wrote:Here is an actual picture of the coloured vacuum hoses

Turbo Vacuum pipe colours.JPG

having the same issue i think, does anyone have a better photo and instructions?

thanks for the input everyone. i cleaned the maf sensor and the car is running fine now which means nothing tomorrow as you all know. if the problem comes back i will do more of the troubleshooting when i have someone that can help me rev the engine as suggested above. the maf sensor did not look di...

misha wrote:I just read the code list for p0243 and it says Turbocharger(TC)control valve-signal missing/intermittent fault...signal missing/permanent fault.

Hope it helps.

it would if i knew where that was located and what i should do next

i need pictures and flow charts

jreed wrote:I wrote up a quick DIY on removing and cleaning the MAF sensor, including the T-20 security bit required for those bolts here:
https://www.matthewsvolvosite.com/forums ... 1&p=218607

IMG_5148.jpg

looks like a great write up, thanks!

Okay I will do this first, hopefully I can find something before taking that panel off. Is it going to hurt anything buy driving it with the maf unplugged to work and back until i get it fixed? maybe 6 mile round trip daily.