Hi Guys,
I recently purchased the 5 star tuner and applied the 87 performance tune. No issues after I applied it. I really noticed the difference on the 03 SD V10. It worked great for a day. On the second day, I had an issue with it not starting as soon as I turned the key. I've never had an issue with it not starting immediately when I turned the key in the 3 years I've had the truck (except when the battery died in one of our cold Wisconsin winters. ) It did start but the next time I tried to start it, it faltered and died. I tried repeatedly to start but to no avail. At first I thought maybe I flooded it so held down the pedal before turning key and still no start. Thinking there was an issue with the tune, I applied the stock tune back onto truck via the 5 star/SCT. No issues with applying either tune.
Still doesn't start. luckily I was only 2 blocks away from my regular shop so pulled it over there. They haven't had time to take a look yet. I called 5 star and the only suggestion they had was to have the shop clean the throttle body and maps.
Posting here to see if anyone had similar issues or has any ideas as to why this might have happened.
Thanks
Zeppelindad

 

Any check engine lights? Fuel pump fuse/relay?

 

 

Symptom is of a dying/dead fuel pump. Probably coincidental timing.

 

Yep, bad fuel pump. I forgot to mention that I did read a P0232 code when this did happen. It just had to be a coincidence that the day after I installed the tune, the fuel pump went out. Thanks!