diff --git a/firmware/controllers/algo/engine.h b/firmware/controllers/algo/engine.h
index deaef1b8a4..03a405bc4d 100644
--- a/firmware/controllers/algo/engine.h
+++ b/firmware/controllers/algo/engine.h
@@ -375,6 +375,7 @@ public:
 	bool isAlternatorControlEnabled;
 
 	bool isCltBroken;
+	bool slowCallBackWasInvoked = false;
 
 
 //	floatms_t callToPitEndTime;
diff --git a/firmware/controllers/algo/engine2.cpp b/firmware/controllers/algo/engine2.cpp
index d21dda9d0a..d01182afc0 100644
--- a/firmware/controllers/algo/engine2.cpp
+++ b/firmware/controllers/algo/engine2.cpp
@@ -120,6 +120,9 @@ void EngineState::updateSlowSensors(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
 }
 
 void EngineState::periodicFastCallback(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
+	if (!engine->slowCallBackWasInvoked) {
+		warning(CUSTOM_ERR_6696, "Slow not invoked yet");
+	}
 	efitick_t nowNt = getTimeNowNt();
 	if (ENGINE(rpmCalculator).isCranking(PASS_ENGINE_PARAMETER_SIGNATURE)) {
 		crankingTime = nowNt;
diff --git a/firmware/controllers/engine_controller.cpp b/firmware/controllers/engine_controller.cpp
index 1395898f0c..bff707cd71 100644
--- a/firmware/controllers/engine_controller.cpp
+++ b/firmware/controllers/engine_controller.cpp
@@ -291,7 +291,6 @@ static void invokePerSecond(void) {
 
 }
 
-
 static void periodicSlowCallback(Engine *engine) {
 	efiAssertVoid(CUSTOM_ERR_6661, getRemainingStack(chThdGetSelfX()) > 64, "lowStckOnEv");
 #if EFI_PROD_CODE
@@ -339,11 +338,12 @@ static void periodicSlowCallback(Engine *engine) {
 
 	cylinderCleanupControl(engine);
 
+	engine->slowCallBackWasInvoked = TRUE;
 	scheduleNextSlowInvocation();
 }
 
 void initPeriodicEvents(DECLARE_ENGINE_PARAMETER_SIGNATURE) {
-	scheduleNextSlowInvocation();
+	periodicSlowCallback(engine);
 	periodicFastCallback(PASS_ENGINE_PARAMETER_SIGNATURE);
 }
 
diff --git a/unit_tests/main.cpp b/unit_tests/main.cpp
index df35beed5c..2c84353c3f 100644
--- a/unit_tests/main.cpp
+++ b/unit_tests/main.cpp
@@ -109,7 +109,7 @@ GTEST_API_ int main(int argc, char **argv) {
 //	printConvertedTable();
 	testing::InitGoogleTest(&argc, argv);
 	// uncomment if you only want to run selected tests
-	//::testing::GTEST_FLAG(filter) = "hip*";
+	//::testing::GTEST_FLAG(filter) = "*testFasterEngineSpinningUp*";
 	return RUN_ALL_TESTS();
 }
 
diff --git a/unit_tests/tests/test_fasterEngineSpinningUp.cpp b/unit_tests/tests/test_fasterEngineSpinningUp.cpp
index 1731724cbf..9214c36a91 100644
--- a/unit_tests/tests/test_fasterEngineSpinningUp.cpp
+++ b/unit_tests/tests/test_fasterEngineSpinningUp.cpp
@@ -12,6 +12,8 @@ extern int timeNowUs;
 TEST(sensors, testFasterEngineSpinningUp) {
 	printf("*************************************************** testFasterEngineSpinningUp\r\n");
 
+	timeNowUs = 0;
+
 	EngineTestHelper eth(TEST_ENGINE);
 	EXPAND_EngineTestHelper