When engine system goes into limp moode, something must be wrong omewhere and it could be sensors etc. You need a scan to check/retrieve trouble codes and proceed from there.
Noise diagnosis requires understanding where it is coming from, component responsible for it and conditions under which it occurs, otherwise it is not possible to provide any suggestions. Even with the physical vehicle, some noises are difficult to detect, especially when it requires the vehicle to be under road operating conditions to occur.
Tuesday, April 19th, 2011 AT 8:19 PM