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About Minnow

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  • Ford Model
    Focus ST170
  1. ST170 IMRC stuck Open

    My ST170's engine management light is permanently on, fault code is P1518, Intake Manifold Runner Control stuck open. According to other forums, this is a fairly common failure usully caused by the plastic control cam on the manifold or fixing pin breaking, leaving the control cable from the IMRC module unattached. So I checked the control cam on the inlet manifold, cable is still attached, and the IMRC module pulls the cable as it should when the engine is switched on. I can only assume the IMRC module is incorrectly reporting the fault, but every time I get the fault code re-set, it reappears soon after. I'm trying to avoid forking out the £200 to replace a unit which appears to be working fine, so does anybody have any ideas what the problem might be or how to get the light to stay off?