Originally Posted by
Ls_[eg]hatch
it comes on & off. Only comes on in those rpm ranges.
When i checked the ecu for codes the other day it came back code 55 - Other Malfunction. CONSULT Terminal Required & i have no idea what that means.

Sounds like 1 of three things. Defective or incorrectly inserted PROM or a defective ECM.
I'm assuming this is a SOHC ???