MPG's dropping, suspect batteries or ficm - Ford Powerstroke Diesel Forum
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post #1 of 8 Old 04-07-2013, 04:51 PM Thread Starter
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MPG's dropping, suspect batteries or ficm

I've been noticing my mileage dropping for the past few weeks, gradually. About two months ago I'd fill up, and my calculations would average 18mpg. Now I'm down to about 15. Not the end of the world but definitely noticeable.

I've also noticed when I first start the truck in the morning, my alarm goes off on my CTS letting me know the FICM voltage is low, but it only last seconds. Within about 5-8 seconds from cranking, the FICM voltage is at 48v. However, the dash lights and the screen on the CTS flicker a bit until I get down the road. This is why I suspect I may be having an issue with the batteries.

Driving down the road with the truck fully warmed up, the FICM voltage fluctuates from 47-48v at 60-65mph. At 70-75mph, it holds at around 45v.

Other than that, no other issues.

My plan was to take the truck in and have the batteries tested to see if they're the culprit. They're very new looking Motorcraft batteries but do not have a production date on them.

Is there anything else I may be overlooking?

---Garret
2006 F250 6.0 XLT FX4 CCSB
S&B Intake
MBRP 4" straight pipe with 5" tip
Studded and deleted
CTS w/EGT
Atlas 40 and Looney Tuned

2002 F250 7.3 XL Reg Cab 2wd Sold!
1995 Ram 3500 Dually Reg cab 5.9 12v auto 2wd
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post #2 of 8 Old 04-07-2013, 06:48 PM
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Get the batteries checked asap. Bad batteries can kill an FICM. FMP should never drop below 47volts.

2003 Excursion Eddie Bauer 6.0l 4x4 | 2004 Intake | Zoodad Mod | Upgraded HPOP Cover | ARP Studs | OEM Headgaskets | Updated Turbo Feed-Drain Tubes | EGR Delete | Coolant Filter | Altas 40 | MKM Street Tune | Banks 4" CAT Back | Muffler Delete | High Idle Mod | Blue Spring Update | 6.4 Banjos | CCV Mod | Glowshift Gauges (Boost, Oil Press, Coolant Press, EGT, Volts, Fuel Press) | Rotella ELC | Rotella T6 | V/B Springs | Torque App on ASUS 10" Tablet |
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post #3 of 8 Old 04-08-2013, 03:22 PM
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had simular prb ficm was corrupted led to injector failures on my 03 check batteries asap

-Tom

05 250 KING RANCH CCSB,278k,ARP's,SCT TSX,Atlas 40,STC done,Glowshift FP Gauge,Banks IC System,Blue Spring,Banjo's,CCV mod,Oil Bypass,Diamond Eye 5" Exhaust,Bilstein 5100's,RC Dual Steering Stabilizer,Retro 55W 6k Heads 3k Fogs,Continental Airbags,RSD 48 gal Aux Fuel Tank.





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post #4 of 8 Old 04-09-2013, 06:26 PM Thread Starter
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Got an appointment with the dealer friday to have them checked. Thinking about just fogetting them and throwing in a new set of Interstate batteries. But if these are under warranty, free is better than nothing.

---Garret
2006 F250 6.0 XLT FX4 CCSB
S&B Intake
MBRP 4" straight pipe with 5" tip
Studded and deleted
CTS w/EGT
Atlas 40 and Looney Tuned

2002 F250 7.3 XL Reg Cab 2wd Sold!
1995 Ram 3500 Dually Reg cab 5.9 12v auto 2wd
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post #5 of 8 Old 04-10-2013, 02:00 PM Thread Starter
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Batteries tested good. Did a load test and a test of the water, no dead cells and good cca's. I read some other threads on here stating the ficm shouldn't drop below 45 volts, but a few say 47. Which is it?

---Garret
2006 F250 6.0 XLT FX4 CCSB
S&B Intake
MBRP 4" straight pipe with 5" tip
Studded and deleted
CTS w/EGT
Atlas 40 and Looney Tuned

2002 F250 7.3 XL Reg Cab 2wd Sold!
1995 Ram 3500 Dually Reg cab 5.9 12v auto 2wd
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post #6 of 8 Old 04-10-2013, 02:18 PM
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Ficmrepair.com states: "Again, if the voltage drops below 45, even for a second, during any of these tests, the FICM needs repair." So I guess 45 is the magic number.

2003 Excursion Eddie Bauer 6.0l 4x4 | 2004 Intake | Zoodad Mod | Upgraded HPOP Cover | ARP Studs | OEM Headgaskets | Updated Turbo Feed-Drain Tubes | EGR Delete | Coolant Filter | Altas 40 | MKM Street Tune | Banks 4" CAT Back | Muffler Delete | High Idle Mod | Blue Spring Update | 6.4 Banjos | CCV Mod | Glowshift Gauges (Boost, Oil Press, Coolant Press, EGT, Volts, Fuel Press) | Rotella ELC | Rotella T6 | V/B Springs | Torque App on ASUS 10" Tablet |
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post #7 of 8 Old 04-10-2013, 08:15 PM Thread Starter
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Interesting... so maybe it's an intermittent problem, but I'll monitor it for now. On the plus side, I filled up last night and averaged 18.22mpg. The last tank had been purchased at a larger Mobile station rather than the local, small Chevron outlet where I normally fill up.

---Garret
2006 F250 6.0 XLT FX4 CCSB
S&B Intake
MBRP 4" straight pipe with 5" tip
Studded and deleted
CTS w/EGT
Atlas 40 and Looney Tuned

2002 F250 7.3 XL Reg Cab 2wd Sold!
1995 Ram 3500 Dually Reg cab 5.9 12v auto 2wd
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post #8 of 8 Old 04-11-2013, 05:41 AM
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You'll find that different suppliers have different diesel quality, and diesel in summer time and winter time are different also.

2003 Excursion Eddie Bauer 6.0l 4x4 | 2004 Intake | Zoodad Mod | Upgraded HPOP Cover | ARP Studs | OEM Headgaskets | Updated Turbo Feed-Drain Tubes | EGR Delete | Coolant Filter | Altas 40 | MKM Street Tune | Banks 4" CAT Back | Muffler Delete | High Idle Mod | Blue Spring Update | 6.4 Banjos | CCV Mod | Glowshift Gauges (Boost, Oil Press, Coolant Press, EGT, Volts, Fuel Press) | Rotella ELC | Rotella T6 | V/B Springs | Torque App on ASUS 10" Tablet |
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