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Old 03-04-2011, 21:56   #1 (permalink)
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Battery Died, now car runs like crap

Hey whats up guys

I went out of town for a few days, and when I came back the battery was dead in my 1996 thunderbird 4.6l (found out that my amp for my subs shorted out and drained the battery, so I removed it from the car)

Installed new battery (since the old one was 5 years old) and now the car runs like crap.

If I start it, it will idle for a few minutes then die, if I give it gas it runs very rough and almost dies (sometimes it does,sounds/feels like its misfiring) I can't even drive the car because it runs so bad.

What could be the problem, it ran great before the battery died.


Any thoughts?
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Old 03-04-2011, 23:11   #2 (permalink)
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Re: Battery Died, now car runs like crap

I had the same problem on my 1988 mazda rx7 that I built with a 5.0 Ho with aod.Did you recharge the battery with the cables connected?If so Try removeing both positive and negitive cables for 5 minutes,then reinstall the cables.My 88 rx7 had a 1988 5.0 with efi and aod tranny.It sat for 2 months and when I went to start it the battery was dead.So I recharged the battery and the car would barely run after 2 nights of checking it out and filling my garage with black smoke I dissconnected the cables and waited 5 min. reinstalled cables and car fired up and ran good.It took a couple of days of driving for the computer to reset itself,but after that all was good. Good luck.
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Old 03-04-2011, 23:48   #3 (permalink)
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Re: Battery Died, now car runs like crap

Thanks for the reply, I just ran out to remove the cables.

I will give it a good 20mins, then put them back on.

I will let you know what happens.

Thanks again, (fingers crossed, I hope this works)
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Old 03-05-2011, 00:29   #4 (permalink)
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Re: Battery Died, now car runs like crap

Well............just reconnected the battery cables and It didn't work (thanks for the help anyways)

I had the battery unhooked for a little over 25 minutes, and it is still the same. (I even pumped the brakes and turned on the light switch (while the battery was unhooked) to drain any left over voltage in the wires)

(more info about the car: check engine light isn't on, scanned the car for codes and nothing came up, cleared codes using the scanner (just in case some were hiding), I have fuel in the tank, just recently replaced the fuel pump (within last 6 months, and can hear it turn on) checked the coil packs and both are up to specs (tested using ohm meter), battery is at 12.5 volts and holding, Alt is working 14.5 volts at idle)


but the car is still running like crap.

I can't see it being something major as the car was running great before the battery went out
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Old 03-05-2011, 12:20   #5 (permalink)
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Re: Battery Died, now car runs like crap

If it was a short , check fuses in case it has blown any affecting engine electrics / sensors ?
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Old 03-07-2011, 23:57   #6 (permalink)
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Re: Battery Died, now car runs like crap

Hey whats up guys,

Sorry I haven't replied I have been sick for a last few days, and haven't felt good enough to check out the car.

Before I got sick, I did manage to check the engine compartment fuse's and none of them were blown.

Though I have not checked the ones under the dash yet
(I will check these once I get better)
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Old 03-13-2011, 01:30   #7 (permalink)
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Re: Battery Died, now car runs like crap

Check all fuse's (nothing blown) what else should I check?


just can't get it to run good

please help!!
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Old 03-13-2011, 03:55   #8 (permalink)
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Re: Battery Died, now car runs like crap

it may have damaged the engine computer

Ian
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Old 03-13-2011, 16:31   #9 (permalink)
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Re: Battery Died, now car runs like crap

What about engine coolant temp sensor knackered and sending wrong info to ECU , possible ?
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