i have had a cel on and its p1518. wich is says the manifold secondaries are stuck open. i checked it out and its not. i have a new imrc and i had it mounted on the battery rack and it fell off. i think when it hit the tranny it must have did something to the box. ould something in the box be loose causing the cel. my secondaries seem to be working fine, and i remounted the box differently.