Hello Looking for some direction please help! I cannot make heads or tails from this. I finally had some time try out the Nefmoto Software,  Took a little playing around to get the cable to work and get connect to the ecm, but I got it.  After, lots of reading and re-reading forums and tutorials.  I read my stock file and saved them to my laptop.  I was playing around with baud rates and generally just feeling my way around, (baby steps ofcourse!!)  As I was astonished that I could get it to connect and read the ecm, as I have been having a very hard time connecting.

At this point I got a bit bold and...

I thought I would try to write the original tune back to the ecm and see what happens. I tried to see if the file matched and it did, so I figured what could it hurt??
So I tapped the write button and away it went, did its thing, all was well!  the car ran well too!

Today, I went to start my car and slight low battery and now the engine is miss firing and chugging etc.  undrivable.

Is there anything I could have done wrong?  I mean it was the stock file, Or am I missing something? 

1.8T 8E0909518AK,  I used the memory layout 29F800BB

I checked the DTCs with vcds random miss fires and what not,  P30 terminal low voltage if that makes sense.  (dead battery I am thinking)

Please help, any help would be appreciated.   Thanks in advance
   

After flashing the ecm. I went for a test drive and smoked a raised manhole hard (really rough roads).  I didn't think the flashing of the ecm did anything after a barrage of panic set in. I rechecked the flash said it matched and was good.  Just looking for some confirmation. 

Coincidence I guess!

Thanks for the reply I will check the wiring to #3 & #4 coils make sure they are good.



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