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Old 05-17-2014, 01:26 PM   #1
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Idle problem

I have a 92 LX 5.0. The car has recently started idling low with the battery gauge fluctuating. The battery warning light came on only once. The car feels like it wants to shut down at a stop but so far it has not. Under power the car drives fine. I have a BBK cold air intake, Cobra upper and lower, BBK headers, Flowmaster cat back exhaust, Ford a Racing 70mm throttle body, everything else is stock. Any help is appreciated.
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Old 05-17-2014, 06:32 PM   #2
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Sounds like the altonator may be going out
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Old 05-17-2014, 08:51 PM   #3
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That's what I thought. Wanted to get some second opinions.
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Old 05-19-2014, 05:47 AM   #4
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I would take it to auto store and have it checked
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Old 05-22-2014, 01:32 PM   #5
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Classic bad alternator. The stock alternators on foxes are horrible though, do NOT replace it with another fox alternator. Upgrade to a SN95 "3G" alternator. Its not hard at all and is one of those mods every fox owner should do. Google how to do it, info is everywhere.
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Old 05-22-2014, 01:37 PM   #6
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Quote:
Originally Posted by Odub421 View Post
I have a 92 LX 5.0. The car has recently started idling low with the battery gauge fluctuating. The battery warning light came on only once. The car feels like it wants to shut down at a stop but so far it has not. Under power the car drives fine. I have a BBK cold air intake, Cobra upper and lower, BBK headers, Flowmaster cat back exhaust, Ford a Racing 70mm throttle body, everything else is stock. Any help is appreciated.
I agree it sounds like a worn out alternator. Now would be a good time to upgrade the weak stock alternator anyways. There's several other units available that produce significantly more AMP's than stock. Both PA and SR Performance make a quality upgraded alternator if you're interested!

I'd also get the battery tested at your local auto service center. If your battery is hold, a weak alternator can really put excessive strain on the battery- ultimately ending it's life too. Hopefully that's not the case for you, but just a heads up!

Shane
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Old 05-22-2014, 02:14 PM   #7
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Thanks for the info. I had the battery and alternator checked at Autozone. They confirmed my battery bad but alternator was good. I'll replace both anyway.
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Old 05-22-2014, 02:30 PM   #8
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Even if your alternator came up good it could be a case like what happened with my girlfriends mustang where the alternator killed the battery because it was too weak

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Old 05-22-2014, 02:57 PM   #9
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What amp and brand do you guys recommend?
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Old 05-22-2014, 04:46 PM   #10
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I like the amps and kits that latemodelrestoration.com has, but if money isn't a problem then AmericanMuscle.com is a great way to go too

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Old 05-22-2014, 08:33 PM   #11
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Parts store 94/95 rebuilt one is just fine. Look up the swap online, its not very complicated.
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Old 05-22-2014, 09:49 PM   #12
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Thanks everyone. One more thing, how difficult is it to replace all the pullys and the serpentine belt? I'm not too mechanically inclined and have a moderate collection of basic tools.
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Old 05-22-2014, 10:06 PM   #13
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If you have a basic 3/8" ratchet set you can do the belt. Its VERY easy. However, if you are just doing the alt the pulley is on it already. Other stuff should not need replacing unless you have a shot tensioner or a worn out idler pulley. Or are doing underdrives...
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Old 05-23-2014, 12:44 PM   #14
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Quote:
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What amp and brand do you guys recommend?
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Thanks everyone. One more thing, how difficult is it to replace all the pullys and the serpentine belt? I'm not too mechanically inclined and have a moderate collection of basic tools.
There's several choices to go with as far as amperage. I personally prefer to go with a 130amp or higher. Since all of my cars tend to sit for long periods of time and may only be fired up for a little bit, the stronger amp alternators charge the battery much quicker. The SR Performance 150amp alternator is one of the best options for a reasonable budget. Plus it's ready to go as a 3G series alternator!

You can do the install yourself with basic hand tools. There's no reason to change the pulley out either, these alternators come with the stock size pulley's pre-installed!

Shane
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Old 05-24-2014, 08:01 PM   #15
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And to add on to the alt pulley. There is absolutely 0 reason to do an underdrive pulley on the alternator. Benefit is 1 flywheel hp at MOST and con is potential charging problems. All my Mustangs have always had the stock alt pulley even the ones with underdrive pullies on the water pump and crank.
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