diff --git a/BoardM5stackCore.cpp b/BoardM5stackCore.cpp
index e41afd0..523a067 100644
--- a/BoardM5stackCore.cpp
+++ b/BoardM5stackCore.cpp
@@ -21,7 +21,7 @@ void BoardM5stackCore::initBoard() {
 
   // Mute speaker
   //ledcWriteTone(TONE_PIN_CHANNEL, 0);
-  digitalWrite(SPEAKER_PIN, 0);
+  dacWrite(SPEAKER_PIN, 0);
 
   //
   Board320_240::initBoard();
diff --git a/CommObd2Can.cpp b/CommObd2Can.cpp
index 6607d9b..ba3881c 100644
--- a/CommObd2Can.cpp
+++ b/CommObd2Can.cpp
@@ -196,7 +196,7 @@ void CommObd2Can::sendPID(const uint16_t pid, const String& cmd) {
 */
 void CommObd2Can::sendFlowControlFrame() {
 
-  uint8_t txBuf[8] = { 0x30, requestFramesCount /*request count*/, 14 /*ms between frames*/ , 0, 0, 0, 0, 0 };
+  uint8_t txBuf[8] = { 0x30, requestFramesCount /*request count*/, 20 /*ms between frames*/ , 0, 0, 0, 0, 0 };
   
   // insert 0x07 into beginning for BMW i3
   if (liveData->settings.carType == CAR_BMW_I3_2014) {