diff --git a/opm/simulators/flow/SimulatorFullyImplicitBlackoil.hpp b/opm/simulators/flow/SimulatorFullyImplicitBlackoil.hpp
index 6c003897e..c1af0fce8 100644
--- a/opm/simulators/flow/SimulatorFullyImplicitBlackoil.hpp
+++ b/opm/simulators/flow/SimulatorFullyImplicitBlackoil.hpp
@@ -378,29 +378,40 @@ public:
         // \Note: The report steps are met in any case
         // \Note: The sub stepping will require a copy of the state variables
         if (adaptiveTimeStepping_) {
-            const auto& events = schedule()[timer.currentStepNum()].events();
-            if (events.hasEvent(ScheduleEvents::TUNING_CHANGE)) {
-                const auto& sched_state = schedule()[timer.currentStepNum()];
-                const auto& max_next_tstep = sched_state.max_next_tstep(enableTUNING);
-                if (enableTUNING) {
-                    const auto& tuning = sched_state.tuning();
-                    adaptiveTimeStepping_->updateTUNING(max_next_tstep, tuning);
-                    // \Note: Assumes TUNING is only used with adaptive time-stepping
-                    // \Note: Need to update both solver (model) and simulator since solver is re-created each report step.
-                    solver_->model().updateTUNING(tuning);
-                    this->updateTUNING(tuning);
-                } else {
-                    adaptiveTimeStepping_->updateNEXTSTEP(max_next_tstep);
-                }
-            }
+            auto tuningUpdater = [enableTUNING, this, reportStep = timer.currentStepNum()]()
+            {
+                auto& schedule = this->ebosSimulator_.vanguard().schedule();
+                auto& events = this->schedule()[reportStep].events();
 
+                if (events.hasEvent(ScheduleEvents::TUNING_CHANGE)) {
+                    // Unset the event to not trigger it again on the next sub step
+                    schedule.clear_event(ScheduleEvents::TUNING_CHANGE, reportStep);
+                    const auto& sched_state = schedule[reportStep];
+                    const auto& max_next_tstep = sched_state.max_next_tstep(enableTUNING);
+                    const auto& tuning = sched_state.tuning();
+
+                    if (enableTUNING) {
+                        adaptiveTimeStepping_->updateTUNING(max_next_tstep, tuning);
+                        // \Note: Assumes TUNING is only used with adaptive time-stepping
+                        // \Note: Need to update both solver (model) and simulator since solver is re-created each report step.
+                        solver_->model().updateTUNING(tuning);
+                        this->updateTUNING(tuning);
+                    } else {
+                        this->adaptiveTimeStepping_->updateNEXTSTEP(max_next_tstep);
+                    }
+                    return max_next_tstep >0;
+                }
+                return false;
+            };
+            tuningUpdater();
+            const auto& events = schedule()[timer.currentStepNum()].events();
             bool event = events.hasEvent(ScheduleEvents::NEW_WELL) ||
                 events.hasEvent(ScheduleEvents::INJECTION_TYPE_CHANGED) ||
                 events.hasEvent(ScheduleEvents::WELL_SWITCHED_INJECTOR_PRODUCER) ||
                 events.hasEvent(ScheduleEvents::PRODUCTION_UPDATE) ||
                 events.hasEvent(ScheduleEvents::INJECTION_UPDATE) ||
                 events.hasEvent(ScheduleEvents::WELL_STATUS_CHANGE);
-            auto stepReport = adaptiveTimeStepping_->step(timer, *solver_, event, nullptr);
+            auto stepReport = adaptiveTimeStepping_->step(timer, *solver_, event, nullptr, tuningUpdater);
             report_ += stepReport;
             //Pass simulation report to eclwriter for summary output
             ebosSimulator_.problem().setSimulationReport(report_);
diff --git a/opm/simulators/timestepping/AdaptiveSimulatorTimer.cpp b/opm/simulators/timestepping/AdaptiveSimulatorTimer.cpp
index db575bebd..2c36efcf5 100644
--- a/opm/simulators/timestepping/AdaptiveSimulatorTimer.cpp
+++ b/opm/simulators/timestepping/AdaptiveSimulatorTimer.cpp
@@ -62,7 +62,7 @@ namespace Opm
         return ( report_step_ == 0 ) && ( current_step_ == 0 );
     }
 
-AdaptiveSimulatorTimer& AdaptiveSimulatorTimer::operator++ ()
+    AdaptiveSimulatorTimer& AdaptiveSimulatorTimer::operator++ ()
     {
         ++current_step_;
         current_time_ += dt_;
@@ -115,6 +115,12 @@ AdaptiveSimulatorTimer& AdaptiveSimulatorTimer::operator++ ()
         return dt_;
     }
 
+    void AdaptiveSimulatorTimer::setCurrentStepLength(double dt)
+    {
+        assert(dt > 0);
+        dt_ = dt;
+    }
+
     double AdaptiveSimulatorTimer::stepLengthTaken() const
     {
         assert( ! steps_.empty() );
diff --git a/opm/simulators/timestepping/AdaptiveSimulatorTimer.hpp b/opm/simulators/timestepping/AdaptiveSimulatorTimer.hpp
index e02dc4684..3dffd4908 100644
--- a/opm/simulators/timestepping/AdaptiveSimulatorTimer.hpp
+++ b/opm/simulators/timestepping/AdaptiveSimulatorTimer.hpp
@@ -69,6 +69,9 @@ namespace Opm
         /// \brief \copydoc SimulationTimer::currentStepLength
         double currentStepLength () const;
 
+        // \brief Set next step length
+        void setCurrentStepLength(double dt);
+
         /// \brief \copydoc SimulationTimer::totalTime
         double totalTime() const;
 
diff --git a/opm/simulators/timestepping/AdaptiveTimeStepping.hpp b/opm/simulators/timestepping/AdaptiveTimeStepping.hpp
index a3fa7df13..ed5be969e 100644
--- a/opm/simulators/timestepping/AdaptiveTimeStepping.hpp
+++ b/opm/simulators/timestepping/AdaptiveTimeStepping.hpp
@@ -39,6 +39,7 @@
 #include <algorithm>
 #include <cassert>
 #include <cmath>
+#include <functional>
 #include <memory>
 #include <set>
 #include <sstream>
@@ -342,13 +343,18 @@ std::set<std::string> consistentlyFailingWells(const std::vector<StepReport>& sr
 
         /** \brief  step method that acts like the solver::step method
                     in a sub cycle of time steps
+            \param tuningUpdater Function used to update TUNING parameters before each
+                                 time step. ACTIONX might change tuning.
         */
         template <class Solver>
         SimulatorReport step(const SimulatorTimer& simulatorTimer,
                              Solver& solver,
                              const bool isEvent,
-                             const std::vector<int>* fipnum = nullptr)
+                             const std::vector<int>* fipnum = nullptr,
+                             const std::function<bool()> tuningUpdater = [](){return false;})
         {
+            // Maybe update tuning
+            tuningUpdater();
             SimulatorReport report;
             const double timestep = simulatorTimer.currentStepLength();
 
@@ -377,8 +383,14 @@ std::set<std::string> consistentlyFailingWells(const std::vector<StepReport>& sr
 
             // sub step time loop
             while (!substepTimer.done()) {
+                // Maybe update tuning
                 // get current delta t
-                const double dt = substepTimer.currentStepLength() ;
+                auto oldValue = suggestedNextTimestep_;
+                if (tuningUpdater()) {
+                    substepTimer.setCurrentStepLength(suggestedNextTimestep_);
+                    suggestedNextTimestep_ = oldValue;
+                }
+                const double dt = substepTimer.currentStepLength();
                 if (timestepVerbose_) {
                     detail::logTimer(substepTimer);
                 }