FICM or Injectors? - Ford Powerstroke Diesel Forum
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Old 01-25-2012, 01:23 PM
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FICM or Injectors?

Here lately my truck has been running rough on start ups, usually after sitting over night. I had a code for the FICM, so I checked it. Putting out 47.7 volts. I cleared the code and has not popped up since. I thought ok maybe its because of the colder weather. Then I noticed it didn't have as much power and the fuel economy was getting worse.


So I bought some Rev X from Vivian to see if it could possibly be a stuck injector (I need to run Rev X anyway). Gonna drive it awhile to see if it gets better.

Also on start ups the CTS will show a voltage reading of 40.0. Then it will go back to 48.0 volts. If it matters I replced the batteries last summer. So I don't think the batteries are bad they show good voltage with a meter.

My question is, could it be possible that the FICM is going bad and I also have a sticking/ bad injector? I'm thinking that it's both. The reason I think this is because maybe a stuck/ bad injector could be putting stress on the FICM making it show a code. Ex. stuck injector putting a load (higher current draw)on the FICM causing a loose/ bad connection or low voltage. Throwing a code.

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Old 01-25-2012, 01:38 PM
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A. Are you testing the batteries independently and disconnected from the truck? If not, that's crucial.
B. 40 volts sounds low, even with the glow plugs coming on.
C. I'm much more suspect of the FICM than I am the stuck injector theory.
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Old 01-26-2012, 04:41 AM
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Yea the voltage on each battery checks good. One is 12.6 and the other is 12.8. I just think its strange that the FICM voltage goes back to normal ranges after the truck warms up. It was showing 38.5 volts this morning. Temp was around 45*F.
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Old 01-26-2012, 04:55 AM
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Quote:
Originally Posted by ptsk06tank View Post
Yea the voltage on each battery checks good. One is 12.6 and the other is 12.8. I just think its strange that the FICM voltage goes back to normal ranges after the truck warms up. It was showing 38.5 volts this morning. Temp was around 45*F.
its junk, replace it before it ruins injectors.
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Old 01-26-2012, 04:56 AM
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Your FICM needs to repaired, if it dips below 45V at any time, then it is on its way out. Mine is rock steady at 48-48.5V all the time after repair at FICMRepair.com. Get it fixed before it DOES hurt your injectors.
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Old 01-26-2012, 05:23 AM
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Quote:
Originally Posted by ptsk06tank View Post
Yea the voltage on each battery checks good. One is 12.6 and the other is 12.8. I just think its strange that the FICM voltage goes back to normal ranges after the truck warms up. It was showing 38.5 volts this morning. Temp was around 45*F.
The reason it does this is probably because of the inductive heating that it does to the injectors, it is supposed to help with stiction. When is doing this the FICM is under its largest load so the V drops more.
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Old 01-26-2012, 06:17 AM
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Thanks, Should I go with a 48V or 58V FICM?
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Old 01-26-2012, 08:48 AM
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your decision, the only upside to the 58v is slight better cold starting.

BTW get your batteries LOAD tested, dont check their voltage with a multi meter. You need to test the load capacity reading the CCA (cold cranking amps) of the battery, they need to be disconnected and need a special tool to do so.. you can buy a load tester from harbor freight for $25 thats what I did.. well worth the money

Mine read over 13v on both but on a load test only pulled 650cca on batteries rated at 880cca..

your batteries are probably bad which led to damaging the ficm
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Old 01-26-2012, 10:12 AM
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^^^ What they said! The FICM needs to be repaired/replaced and load test the batteries. Both of my batteries showed over 12V on the meter but both failed under load and were replaced.
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Old 01-26-2012, 10:31 AM
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^^^what they both said. the batteries need to be 100%. i suggest ed at ficmrepair.com and then sending it to PHP to have it tuned. a 48v module can still be tuned. a 58v module just costs more. all depends on what u wanna spend
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