my 6.0 starts very hard when sitting overnight in 20 degree or less temps it start and runs for about 10seconds and quits it does this for about 5 times then starts blows black smoke runs rough for about 3or4 minutes then runs great
As said ficm is of concern you need to check it for voltage with koeo and during cranking both volt values should be aroun 48 volts. There is detailed info how to test ficm. search testing ficm and alot of info is available here.
If the FICM is bad or fails the 48 v test are there aftermarket FICMs that are better than OEM or is a Ford part needed? Up here on Vancouver Island price for a FICM for 2006 f250 6.0l CC SB Lariat is about $800 +- plus 4 hrs to instal. Is this in the ball park? I plug my truck in for about 2 hours prior to starting and it starts right up nice and smooth. Cold starting at 32F stumbles and quits for about 5-7 tries. Runs really rough for 10 seconds then levels out nice. No problems rest of day. Any other suggestions? thx
Then if you have to send it off I'd say 15 minutes or less to get the part in and out, depening on how comfortable you are with finding everything. Just be really careful of the electrical connectors or you'll have a side project fixing them while the FICM is out being worked on.
I still say injectors, but FICM is a very good candidate to be the problem as well. Really need some gauges to diagnose. If you plan to do all your own work then look into getting an autoenginuity with ford enhancements. That will help tons and pay for itself (it cost around $500 IIRC).
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