i have read several threds about hard cold starts after having some performance tunes programed into the ficm, also some places retune ficms with the early 03 tune, this is why i asked which one it had on it.

 

it was a performance tune...

should be called a "de-performance" tune

 

They can do a FICM rollback sure, to get some of the older features of the programming on the old FICM's. I've LOVED the old FICM's I've got my hands on. EricC has one of the best FICM's I've ever tried. No one really just loads an 03 tune on, unless you went to the dealer and requested it, and I'm pretty sure they wouldn't even do that. They do use parts of the 03 programming though.

Most are doing full out custom tunes on the FICM's now, and most of the cold hard starts are from the FICM's with the race tuning on them, meant for trucks with large injectors anyways.



I'm awaiting for the answer now cause the truck is fixed.... where are ya bud????

 

i got to reading up on it because were doing a performance build on a guys 6.0 right now and he requested a custom tune on his ficm but it is getting 205cc injectors also but i have for warned him about the cold starts

 

I think they've fine tuned the FICM tuning now though and it's not as bad as when it first came out. I'd call Eric @ Innovative up and ask him about it, you could just do a mild FICM tune if you're worried about cold starts. Mike @ KEM is supposed to be doing some killer FICM tuning as well. You could always just do a 58V unit and not worry about the tuning.

 

the guy has eric's tune on his sct now and was planning to go with erics ficm tune also

 

I've got a 2006 Psd my edge cs shows 44 volts on startup after 10 min it's 48 volts it's about -20 Celsius out just wondering what ficm voltage should be in weather like that:

 

It shouldn't drop, even when cold.
Batteries lose a lot of their cranking amps when they get cold. If a battery is marginal it will show in cold weather. Have your batteries load tested...make sure they first charge them til they show fully charged, then have them put the load tester on them for at least 15 seconds. If they're good, they'll hold their voltage. If they're bad the voltage will drop before 15 seconds has elapsed.
If your batteries pass the load test, your FICM power supply is bad.

You could also test your battery voltage when it's cold...when the FICM volts are 44. If the battery voltage is less than 10, the batteries are marginal.