Runs rough when cold.

[mpage18]

Ok so i am not looking forward to hear the answer to this but here goes. i have a 2006 6.0 and when i go to start it in the morning it turns over longer than it should before it starts. Then it takes a few mins before it runs worth a crap. about a mile and a half. After that it runs great with no issues. No white smoke and no other problems. Any ideas whats going on?????

[magillabm]

I had the same issue with my 06 6.0....Check your ficm voltage and batteries...any dtc's?

[mpage18]

Well how do you check the ficm voltage. And what is dtcs

[magillabm]

There is a way to check your ficm voltage with a volt meter. You can do a search on this forum how to check it using a volt meter. I use a scan tool that plugs into my obdII port.

DTC are diagnostic trouble codes that may or may not turn on your check engine light which can also be checked using a scan tool. I used the auto enginuity tool and/or a torque app for my smart phone.

My ficm voltage at KOEO (key on engine off) was at 38 volts and truck ran rough, bucked and had no power for about 3 minutes...also blew a little white smoke. Your ficm voltage should never be less than47 volts.

I sent my ficm to ficmrepair.com and were very helpful. Sent it to them and had it back all within 5 days

[mpage18]

ok so i just checked my ficm voltage and i was hoping that was the problem but it was at 48.5 with key on engine off and while running. What now??

[mpage18]

also it runs bad when engine is cold not cause temp outside is cold. its summer. just clearing that up

[PSDMikeB]

did you check your FICM when the truck was cold (i.e. had not run for several hours)?

MikeB

[mpage18]

its been sitting for 4 days when i checked it

[southend]

Originally Posted by mpage18

ok so i just checked my ficm voltage and i was hoping that was the problem but it was at 48.5 with key on engine off and while running. What now??

just showing 48 volts does not mean your ficm is ok.

Sent from my SCH-I500

[mpage18]

alright then? so what now! should i just take it to get checked out or is there something else i can test.