Can weak batteries cause strange issues? - Ford Powerstroke Diesel Forum
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post #1 of 20 Old 11-26-2010, 11:53 AM Thread Starter
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Can weak batteries cause strange issues?

My truck has been running great since the day I bought it in 2000. recently I have been having problems with hard starting in the mornings. Temps are around 40 degrees out in the morning. I checked te glow plugs and found one to be bad so I replaced all of them. The hard starting is still there but now I get loping sometimes when it is still cold. Yesterday I started the truck and let it warm up a few minutes and took off down the road. The truck started loping a little but I figured it would go away after it warmed up. I was about a mile away from where I started and it started running real rough and I pushed the accelerator to the floor and it blew some white smoke. I let off and it shut down. Could not get it to start and ran the batteries down after three tries. Had it towed to the house (the wrecker also had a truck with the 7.3) and charged it up overnight and tried to crank it but after two tries the batteries went dead. Replaced the batteries and got it to crank and it is running great??? CPS has been changed and I have replaced the fuel filter recently also. Can weak batteries cause issues like this?
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post #2 of 20 Old 11-26-2010, 12:26 PM
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Absolutely. Think about how many things related to the engine are controlled by computers.......which run on electricity provided by batteries/alternator. Low volts/amps will cause the electronic controls to run at a less than optimal condition and that carries over to the motor itself. There's a number of owners who swear their truck ran better after simply upgrading their alternator.
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post #3 of 20 Old 11-26-2010, 12:30 PM
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Yes weak batteries can cause problems especially at starting. I would also recommend having an injector buzz test and cylinder contribution test conducted on the truck.


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post #4 of 20 Old 11-26-2010, 01:12 PM Thread Starter
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Thanks Guys. We will see what she does in the morning. I hope the issue is as easy as that.
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post #5 of 20 Old 11-26-2010, 02:00 PM
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Be careful if you have a chip on there cause bad batteries/alternator(s) can cause some bad problems with the chip and systems connected to the chiplpu
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post #6 of 20 Old 11-26-2010, 02:07 PM
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Quote:
Originally Posted by Tblom View Post
Be careful if you have a chip on there cause bad batteries/alternator(s) can cause some bad problems with the chip and systems connected to the chiplpu
Say what? I have had a chip on my truck for 4 years now. I have had dead batteries, low powered batteries, bad injectors, bad glowplugs, a ton of hard start situations in the cold winters of Michigan. I have yet had a problem due to my chip.


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post #7 of 20 Old 11-26-2010, 02:11 PM
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you might also get your alternator tested to, to make sure it is working properly


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post #8 of 20 Old 11-26-2010, 02:25 PM
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Quote:
Originally Posted by Tblom View Post
Be careful if you have a chip on there cause bad batteries/alternator(s) can cause some bad problems with the chip and systems connected to the chiplpu
Quote:
Originally Posted by bigcountrysg View Post
Say what? I have had a chip on my truck for 4 years now. I have had dead batteries, low powered batteries, bad injectors, bad glowplugs, a ton of hard start situations in the cold winters of Michigan. I have yet had a problem due to my chip.
bigcounty -- I'm with you on this. Look at the post count of the person making that statement.......
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post #9 of 20 Old 11-26-2010, 02:32 PM
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Yes, I've seen the alternator go bad on a 7.3 and my friend had a chip and it was running bad after the alternator was replaced and it was running very rough and he upgraded chips and then all the problems went away
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post #10 of 20 Old 11-26-2010, 03:02 PM
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Yes I've seen that happen on my friends 7.3. The alternating went bad and when he replaces it was running realty rough and stalling so he upgraded his chip and then all the problems went away
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