FICM and injector problems

[UKShooter]

Hey guys, I'm new to posting to the forum but I have been using this place to diagnose, fix and potentially make upgrades. My problems seem to all happen at once and I just thought I would get some advice from others.

My truck ('05 6.0L King Ranch) has been having a rough start on cold mornings and releasing a little white smoke on initial startup. Searched the forum and found I should check FICM. I did that and it had 48V with the key ON, but while running it would fluctuate anywhere from 48V-34V. I decided to pull it off and do the re-soldering job. Put the FICM back on the truck and now it still has 48V with key ON, 48V when running, but while cranking I saw it drop down to 20V then immediately bounce back up. -Have I fixed the problem or is my FICM still bad?

Decided to take the truck to a dealership and have them do a diagnostic on it to check injectors, glow plugs and anything else they could. They found injectors #1,6,7,8 "faulty". Of course they want an arm and a leg to fix them so I am going to ask a diesel mechanic I know what he would charge but before I do that I need to know, if I do replace all of the injectors am I wasting my time because the FICM kicked down to 20V when cranking? I don't want to ruin brand new injectors.

Any suggestions would be greatly appreciated.

[Bluedemon6.0]

I would replace the Ficm, because your voltage should not drop past 47v coming from your ficm. If you still have problems then you probably took out your injectors as well but you can get those rebuilt, worst comes to worst. I would not replace then injectors until you fix the Ficm voltage. Btw welcome to the org.

[a2elvis]

Your FICM is bad! Start there, then retest injectors.

Without the FICM working properly, any test done to prove bad injectors is innacurate.

[UKShooter]

Thanks for the welcome. I just got off of the phone with the dealership and asked if they checked the FICM when they did the diagnostic and they said yes and it was fine... I told him about the 20V drop and he said that nothing came up on the computer and there were no codes showing up about the FICM. Now I'm torn, I really want to believe the test they ran and hope that my home test was just a mishap.

[NSTENGER]

FICM Repair.com - Your Source for FICM Repair

Alot of guys on this forum have used this guy and give him great reviews.

[southend]

Welcome. Load test your batteries, nefore you put another ficm in. Bad batteries kill ficms. Check out ficmrepair.com. And get a monitor on that truck......Write Up: Monitoring the 6.0L PSD.

Sent from my phone that somebody didn't help me get.

[chris0000]

I would not trust the dealership. I have been screwed by dealerships more than I care to explain. I only used them while my vehicle was under warranty and then see ya! Find a good individual that works on diesels in your area. Search google maps then drive by and talk to them. I have found that most are super friendly and will give good advise regardless if you use them or not.

[a2elvis]

Originally Posted by UKShooter

Thanks for the welcome. I just got off of the phone with the dealership and asked if they checked the FICM when they did the diagnostic and they said yes and it was fine... I told him about the 20V drop and he said that nothing came up on the computer and there were no codes showing up about the FICM. Now I'm torn, I really want to believe the test they ran and hope that my home test was just a mishap.

Ask very specific questions: "What is the FICM voltage while cranking when the engine is cold?"

This is usually a really great place to find helpful and kind people that want to help you thru the problems on your truck.

[06superduty3997]

Had the the same problem with my FICM failing on me, and is currently at Ford getting replaced.

[UKShooter]

I just got back from picking up my truck and they said they didn't have any kind of print out results from the test they ran this morning. All they have is the confirmation that during the power balance test on the injectors that #1,6,7,8 were dropping out. I am going to retest the FICM tomorrow after it cools off tonight.

I was looking around the forum and I found a link to Warren Diesel for injectors. Have any of you dealt with them/ heard anything about them?