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post #1 of 8 Old 08-01-2013, 07:47 PM Thread Starter
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weak start?

i have a 04 6.0 and a few months ago i replaced the fuel pump, filters and injectors, CAC boot and just recently all ball joints, bearings, and seals(PAIN IN THE *** btw lol) but ive always noticed that my truck has a weak start i guess youd call it. My buddies 02 7.3 starts up strong he turns the key and she starts nice and strong as opposed to mine. Mine turns over strong then sounds weak. it only happens when its a cold start like after my truck has been sitting. FICM is good and i took a voltage meter out there earlier and both batteries read between 12.5-12.7 volts does that means the batteries are fine or should i crank it and measure the voltage? Its got me stumped cant drive the truck right now because shes on jackstands waiting on her 20x12s to arrive
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post #2 of 8 Old 08-01-2013, 09:10 PM
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Well, do your glow plugs work?
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post #3 of 8 Old 08-01-2013, 09:51 PM Thread Starter
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Originally Posted by JorgeCanek View Post
Well, do your glow plugs work?
according to the dash light they do...no check engine light and my PMT isn't showing any DTCs
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post #4 of 8 Old 08-02-2013, 08:28 AM
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You need to do a load test of the batteries to see if they can deliver enough amperage not just voltage. You can have 13v but only 1 amp availble and a starter cant even turn over.


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post #5 of 8 Old 08-02-2013, 09:06 AM
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Originally Posted by dannyboy950 View Post
You need to do a load test of the batteries to see if they can deliver enough amperage not just voltage. You can have 13v but only 1 amp availble and a starter cant even turn over.
Yep, exactly right. And be sure to disconnect the cables from each battery before testing. My friends truck did this and it turns out the drivers side battery was shot. Best to replace both batteries at once, since when one gets weak the other gets overworked and fails soon thereafter.

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post #6 of 8 Old 08-02-2013, 10:32 AM Thread Starter
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yeah that's what i was going to do. i have a feeling the batteries are whats causing this i work at o reillys so whenever my wheels get in ill test take it to work and test them. the dates on the batteries are either from 09 or 10 if i remember correctly. any recommendations on a good set of batteries? We have people that swear by the red tops but some people say theyre the worst batteries they've ever had. anyone have any personal experience?
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post #7 of 8 Old 08-02-2013, 11:07 AM
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Originally Posted by duracrap View Post
yeah that's what i was going to do. i have a feeling the batteries are whats causing this i work at o reillys so whenever my wheels get in ill test take it to work and test them. the dates on the batteries are either from 09 or 10 if i remember correctly. any recommendations on a good set of batteries? We have people that swear by the red tops but some people say theyre the worst batteries they've ever had. anyone have any personal experience?
Frankly, the motorcraft 850s are a preferred battery for these trucks, and they generally last 4 to 5 years. Optimas don't do very well for these trucks.

2006 CC SB 4x4 6.0L
BPD 6 Phase 53v FICM, EGR, HD Oil Cooler, Bypass Oil Filter & Water Pump
ARP Studs w/ OEM Gaskets
DC Power 190a upper; DB Electric 200a lower alternator
295/65/20 Toyo MTs
PMF 3 Link
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Icon 2.5 piggyback CDC shocks
Dynatrac Free Spin Kit with Dynaloc Hubs
EDGE CTS Monitor w/ EGT, pressure, and temp sensors
Blue FPR Spring Kit
Twin F450 Auxiliary Springs
Banks Monster Exhaust
Truetrac rear/E locker Front with 4.11s
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post #8 of 8 Old 08-02-2013, 05:02 PM
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I just bought 2 motorcraft 850 batteries and my truck starts better than it ever has and when I bought the truck 3 years ago the dealer put napa legend 75 in it. I have only had the motorcraft for a week but I'm happy so far.

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