what kind of scanner are you using?

 

Snap on solus

 

How cold is it? I haven't seen a diesel yet that runs good when it's freezing out and you take off after just firing it up. Did you test the FICM yet? Are you getting any smoke out the exhaust when it's running like crap?

 

Maybe high 50's low 60's. And no I have not checked it yet but no smoke

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What does the metter need to be set on to test the ficm?

 

direct current (DC). some meters have an auto range, others you wil need to set the range high enough to measure 48 volts

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and that temp I wouldnt really concider that cold enough to affect it that bad but I could be wrong. My truck acts tempermental when its below freezing, but that is a start and drive with an extreme tune. I take it easy untill it motor and tranny get up to temp and it runs fine.

 

It's been in the 30s here and have had no issue with customers 6.0s they may be a touch rough on initial start up but that's it.

 

Yeah that's not cold enough to effect it... check the FICM. The sticky is at the top of the page on how to do it. Set it to DC and make sure it can read above the needed 48V, might be a 100 or 200V setting... or auto, depends on the meter.

 

Just tested the FICM and it drops from 45 to 39 when idleing! is this going to be my problem??

 

yep, have it fixed. do not buy a new one because it will have the same weak flaws as the one you have now

 

yes, contact mdub. he fixes them.