diff --git a/speeduino/init.ino b/speeduino/init.ino
index 8a77b4ef..091407ba 100644
--- a/speeduino/init.ino
+++ b/speeduino/init.ino
@@ -813,12 +813,13 @@ void initialiseAll()
 
     interrupts();
     //Perform the priming pulses. Set these to run at an arbitrary time in the future (100us). The prime pulse value is in ms*10, so need to multiple by 100 to get to uS
+    readCLT(); // need to read coolant temp to make priming pulsewidth work correctly.
     if((table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET)) > 0)
     {
-      setFuelSchedule1(100, (unsigned long)(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 500)); //to acheive long enough priming pulses, the values in tuner studio are 0.5ms so those need to be multiplied by 500 to get uS value.
-      setFuelSchedule2(100, (unsigned long)(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 500));
-      setFuelSchedule3(100, (unsigned long)(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 500));
-      setFuelSchedule4(100, (unsigned long)(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 500));
+      setFuelSchedule1(100, (unsigned long)5*(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 100)); //to acheive long enough priming pulses, the values in tuner studio are divided by 0.5 instead of 0.1, so multiplier of 5 is required.
+      setFuelSchedule2(100, (unsigned long)5*(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 100));
+      setFuelSchedule3(100, (unsigned long)5*(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 100));
+      setFuelSchedule4(100, (unsigned long)5*(table2D_getValue(&PrimingPulseTable, currentStatus.coolant + CALIBRATION_TEMPERATURE_OFFSET) * 100));
     }