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post #1 of 12 Old 08-20-2011, 11:00 AM Thread Starter
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Alternator Or FICM

I am getting a white puff of smoke when i start up and a miss when engine is turning over " it smells like raw fuel". I checked my ficm today and with just the key on, I was showing 48 volts. With the engine running at idle it was 35 volts. However, I took my truck to Autozone and had the alternator and batteries checked. Batteries were good but when we checked the alternator it wasn't putting out, i was idleing off the batteries, i rev'd the truck up and the alternator kicked in. The test showed the diodes in the alternator were good but for some reason when i start it, the alternator wont kick on until i rev it up. Should i replace the alternator? Could that be why i have the white smoke and engine turnover miss ?

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post #2 of 12 Old 08-20-2011, 11:01 AM Thread Starter
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also, i imagine that when i checked the ficm, the alternator wasnt putting out since i didnt rev it up.

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post #3 of 12 Old 08-20-2011, 11:26 AM
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The alternator doesn't kick on until a few minutes after starting the truck....normal.
Check your FICM when cranking.
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post #4 of 12 Old 08-20-2011, 11:33 AM Thread Starter
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So should I replace the ficm ?

2006 Crew Cab f250 LWB 6.0
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post #5 of 12 Old 08-20-2011, 11:35 AM Thread Starter
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It did go up to 38 once the alternator kicked in

2006 Crew Cab f250 LWB 6.0
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post #6 of 12 Old 08-20-2011, 02:15 PM
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Sounds like the FICM to me...It should NEVER get that low.
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post #7 of 12 Old 08-20-2011, 03:18 PM
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You should have around 13.5v after starting.
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post #8 of 12 Old 08-22-2011, 08:33 AM
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I had similar behavior in mine (minus the white smoke), and I ended up replacing the FICM with a Swamps Diesel 58v. It's been 2 months with it, and worth every penny as my FICM voltage hasn't dipped below 57 volts. I agree with NYC F-350 in that your FICM voltage should never dip as low as your's has. Based on your written symptoms, it sounds like your FICM is in the beginning stages of failure. Mine was dipping to 29, when I finally had enough and upgraded. During that time, it would eventually climb to 48 and stay there, but then would have random drops to 42 - 45. Bottom line, if you are sure your battery and alternator are doing their jobs, a FICM replacement is a reasonable consideration. I'm no expert like some others on this forum, but from what I understand, I'd rather replace a FICM any day over injectors.

Good Luck!

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post #9 of 12 Old 09-22-2011, 05:22 PM
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def the ficm it should never drop belowe 45
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post #10 of 12 Old 09-23-2011, 02:40 AM
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You can just buy a FICM half shell (part# 4c3z12b599 BARM) for around $350 if you look around the net. Its a easy part to install if you have the tools. You could also upgrade to the swamps FICM for abit more. I just did the half shell replacment last weekend. Now I will send my old FICM out for a repair and then have a good spare for later.

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