runs bad when cold

[LIFTDF250]

hey guys i know this has been brought up multiple times but hard to read through everything and get all answers.. so here it goes

noticed truck would idle really rough off and on during cold starts and smooth out and then started running kinda bad until up to operating temperatures and now its horrible... barely gets up to speed until warms all the way up...

checked the FICM and putting out 48v key on and 47.7 running

did a buzz test on injectors and no codes came back..

what else could be causing this problem..

seems like losing fuel til warms up

thanks in advance

adam

[twoicebergs]

So you must have a diagnostic tool like AE to do the buzz test. What did the balance/contribution show for the cylinders? If you didn't that test, you really need to. BTW, it doesn't always have to throw codes to be a bad injector. Your description sounds like one injector is sticking open.

[DeputyDiesel]

I got some sticky injectors on cold start as well. Runs like s*&t until it gets some heat into it. NO CODES. Was also wondering how to figure out what one/ones it is. They all pass a multimeter test.

On another side when i went to 5w40 delo synthetic it took my rough cold start from 10 minutes to around 5. After about a month of driving. Sticky spool valve I know its a band aid but it helped.

[LIFTDF250]

Yea i had it on a diagnostic tool.. all i did was the buzz test no other test yet i need to do soon. Is it wierd i uninstalled my programmer and it seemed alot worse on cold starts

[twoicebergs]

Best, least expensive tool is one you can borrow is at a friend's house or garage! Next best is AutoEnginuity with the ford bundle for about $360. Your local dealer or shop will do the contribution/balance for about $100. Factor in how times might you use it, where you live and how much time it will save you. You could always go partners if you have some friends with a similar truck.

[kinnisoj]

I noticed a HUGE ( I'm trying to say like reeeley BIG) diffrence in my cold starts after I went from dino oil to synthetic. What oil are you running?

[LIFTDF250]

Rotel 15w40

[6.0FX4]

Try Amsoil 540, it get pretty cold here in Alaska, and that helped my cold starts.
Just take a few more mins to warm your truck up if you dont want to switch oil.