Can a low low battery, cause car to bog? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-15-2003, 06:12 PM
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Can a low low battery, cause car to bog?

I was just wondering if a low battery can cause a car to bog? I was going down the road, and my battery was fine and i could floor it with no problem. I shut the car off and went and got something to eat, go out and the car would barely crank. I got a jump and it was fine, but when i punch it the car bogs some. It charges slightly while going down the road, then the gauge drops down like it looses the charge? (i think its alternator...but its new). Then when i get home and shut it off, it wont even crank. Battery is on the charger atm. Any ideas? Car has a 350, the carb is a edelbrock perfermer....600cfm with Electric choke.

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Old 08-15-2003, 06:30 PM
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I would think so, because the lower the battery voltage, the less power the coil will have on it's output. ie, no spark or at the very least a very weak spark. The faster the engine revs (or tries too, anyway) the more of a demand gets put on the coil and in turn the more the demand on the battery. HTH

By the way, I bought a new alternator for my van a couple of years ago(reman) it lasted two weeks than died, got another under warranty, works great now



Marc
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Old 08-15-2003, 06:36 PM
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thanks for the fast reply. I was going to take the alternator off anyways, ill run in and have it checked where i got it.
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Old 08-15-2003, 06:36 PM
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You did not say what type and year car.

If the Alt is working there should not be a bog or loss of power.

If the Alt is bad then yes, the battery would go dead and the coil would not have current to light the plugs.
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Old 08-15-2003, 06:39 PM
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BTW, check all your connections too before you rip out the alternator.




Marc
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Old 08-15-2003, 06:52 PM
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its a 84 Z28. Its raining atm, i cant do much
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Old 08-15-2003, 07:29 PM
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Check the battery. Is it full of water? A battery with a bad cell will not hold a charge. The alternator will not fully recharge it immediatly. It may take a while after a jump start to regain a full charge. In the meantime the spark may be weak.

How old is the battery? More than 3 years is time to suspect some batteries.

Get a voltmeter and measure the voltage across the battery. It should be more than 12V with a fully charged battery with the key off. Start it up, the voltage should go up to over 14V.

If the voltage goes up when started, it is not the alternator.
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Old 08-16-2003, 04:21 AM
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It does sound like the battery. But, if you are running headers it could also be a problem with the starter getting hot. First thing I would do is check the battery though. Go to the local Auto boys and have them check the battery out. If it checks good then you may need to add a heat shield around the starter.

Kevin
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Old 08-16-2003, 07:35 AM
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I charged the battery over night and it works ok now, maybe that fixed it, Thanks guys
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Old 08-16-2003, 06:15 PM
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Now that it is charged, check the voltage. With the engine off it should be over 12V. When the engine is running at idle it should go to over 14V.
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Old 08-16-2003, 08:54 PM
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i couldnt find the dang volt meter, grrr i hate looking for tools (doesnt happen much) i might just buy one.
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Old 08-17-2003, 07:09 AM
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If you read more than 14V with the engine idling you alternator is OK. Then you have to figure out why you had a problem. If you left the headlights on or something drained the battery then you should be OK. It is very likely that if you have an old battery, the battery is bad and the same thing will happen again when you least expect it.
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Old 08-18-2003, 12:46 PM
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Sometimes when you just get a jump, and then drive the car without recharging the battery on a charger it will fry the diodes in the alternator and that may not show up when you take it off and get it checked. When this happens it will act like the key is on even when it is off.
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Old 08-30-2003, 06:58 AM
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boss had the same problem

his battery was so dead, im guessing it was pulling all the voltage off the alt, but anyways, it would run like crap, but if you disconnected the battery, it would run fine... i went through a charger that way, it just overheated the charger by running it too long. Anyways... replaced the battery and everything was fine, but im guessing his battery was worse, cuz it would bog on regular driving... i was guessing it was his alternator, given the conditions, but we had it tested and it was the battery. Plus the battery was getting hot, and puffing up.... ehhehe got rid of that puppy in a hurry.
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Old 08-31-2003, 11:32 AM
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Just a quick way to check and make sure your altinator is workin right.... Start the car up and then disconnect the postitive cable on the battery... If it stays runnin u got a good altinator.. if it dies then time to replace it..... Kinda suprised no one mentioned this earlier.
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