HF impulse start not arcing

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Hey guys. welding with my dynasty 200sd again.  I am having troubles with the arc not jumping when I turn it on. I am not sure what could be effecting this. but it seems it takes a while or its random when it wants to do it. im on AC doing aluminum.  I have pre flow on. IM at about 20 CFH. the miller recommended settings for 1/8 80 amps 130 freq 80 balance. I dunno what else to state. some times I almost have to scratch start. and its not set on the 2 second lift thing either. as always all help is very appreciated.
Reply:Are all electrical connection clean and tight, especially the work clamp tightly clamped to clean shiny metal near the welding area?"Great spirits have always encountered violent oppostion from mediocre minds."  --  Albert Einstein
Reply:Hello everyone. I need some information, I have AC/DC miller arc welding its just ordinary welding machine, have ac/dc connections in the bottom of machine, a rotating wheel for controlling amperage and power switch.I want to convert it to TIG welding machine for aluminum weld, I know I can use it to weld in steel even without high frequency unit. My question is HOW ABOUT FOR ALUMINUM WELD? What do I need to buy in order to use it for aluminum. Do I need to buy they call it High Frequency Unit so I can able to weld in Aluminum or I need to buy something and what is it?. Pardon me I'm just new about in this welding field. Thanks all for help.
Reply:Thanks razor it was an ebay item and it was shipped pretty far. I will check all the connections are tight. also I will clean my clamp zone as well!