In need of some help - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 03-29-2015, 07:33 PM Thread Starter
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In need of some help

So a few days ago my battery light came on my dash and before I could get it home everything shut off and the truck died , I got it off the road and jumped it twice to get it home. Once home I replaced the alternator and tried to jump and it took SEVERAL attempts to start it, once it started I have no more issues with battery, but the truck has always had some pretty rough cold starts, but now it's runs ROUGH even on first start of the day in 65 degree weather (starts rough and surges and misses and hard shifts until warm) I've replaced a few bad injectors over the past year but after the alternator issue the cold start stuff is awful ! Any help is GREATLY appreciated ! Thanks

The truck is an 03 f350 4x4 single cab dually bulletproofed
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post #2 of 8 (permalink) Old 03-29-2015, 08:44 PM
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Re: In need of some help

Unhook the batteries and test them independently as well as load test them. I bet you need new batteries.

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post #3 of 8 (permalink) Old 03-29-2015, 11:27 PM Thread Starter
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Re: In need of some help

Ok I will test them later this evening ,I haven't had any battery trouble after replacing alternator, it's just starting and running like CRAP till up to operating temps
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post #4 of 8 (permalink) Old 03-29-2015, 11:38 PM
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Re: In need of some help

Test ficm voltage took, might have killed it

06 f250 personal, 05 bmw x5 wife, 14 f350 srw work

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it's a 6.0 nervous goes with it
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post #5 of 8 (permalink) Old 03-30-2015, 12:21 AM Thread Starter
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Re: In need of some help

How do I test that ? I actually happen to have an extra ficm laying around , so that might come in handy ! Lol
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post #6 of 8 (permalink) Old 03-30-2015, 01:34 AM
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Re: In need of some help

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How do I test that ?
You need a scanner of some sort plugged into the OBD connector to check ficm voltage.

05 F350 cclb dually, egr delete, blue spring upgrade, coolant filter, cat and muffler delete, scanguage II
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post #7 of 8 (permalink) Old 03-30-2015, 02:31 AM
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Re: In need of some help

There is a you tube video on it with a multimeter, but if you short it the case bye bye. Just get a scanner, $35 bucks

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post #8 of 8 (permalink) Old 03-30-2015, 03:27 AM
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Re: In need of some help

Scanners aren't 100% accurate reading FICM voltage. I've used AE before which read 47.5V across the board, but when I put a voltmeter on it and tested it the right way, cranking voltage dropped below 20. Check it with a voltmeter.

On top of the FICM is a little access plate. Two small torx screws (which are super easy to drop and lose forever, lol). Take off the plate, underneath there will either be 4 pins or 7. By pins I mean small screw heads. You said 03 model, so you could have 7. I'm not sure which pin you test in the 7pin models...look that part up if you have 7. But if it's a 4 pin, which most are now, you'll test the far right pin, closest to drivers side fender. Wrap electrical tape around the hot (red) probe in your volt meter, only leaving the tip exposed. This will keep you from shorting it out on the case like mentioned above. Ground probe goes to negative battery post. Check voltage key on engine off (KOEO), then again while cranking, then while running. At no point should it drop below 46v.

My guess is that your low voltage issue killed your FICM. They have a tendency to clear up when warm just like injector stiction does. Low voltage kills them almost every time. Keep,driving on a bad FICM and you'll kill injectors.

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