Joined
·
460 Posts
Got the S4s out after the winter sleep. Runs good but boost is only showing 0.5 bar, and it stops at a very consistent point on the gauge. Was close to 1 bar before. Sounds like the wastegate is opening at its mechanical limit, and that the electronic system to increase that is not working. I read the service manual section on how that system works, there are quite a number of things that have to be present (throttle position, rpm, temperature, etc).
I will go through all those things when I get a chance, most of them can be monitored on Esprit Scan, but what are the common failure points for this? There must be at least 20 different places this system can fail when you include all the vacuum hoses. What's should I look for first?
I will go through all those things when I get a chance, most of them can be monitored on Esprit Scan, but what are the common failure points for this? There must be at least 20 different places this system can fail when you include all the vacuum hoses. What's should I look for first?