I've been having some issues with the RPM limit on my 2004 sti running a g4 V7-9 ecu.
The car will sometimes rev all the way out to the 7800 limit, but most of the time when it hits a wall anywhere between 5000 and 6500 rpm and the ecu is telling me that the RPM limit has been activated . When I check the logs the times when it hits this "RPM limit" the RPM is jumping up to 18000+ RPM.
This won't happen at the same RPM every time or in the same gear. For example 2nd gear will have no issues and then 3rd gear it will hit this "limit" and other times it will do it in 2nd but not 3rd.
I've tried replacing the Crank angle sensor as well as the Cam angle sensor, but neither have made a difference.
Any help would be much appreciated.