Having a lot of issues, need to get to the bottom of this - Ford Powerstroke Diesel Forum
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Old 06-19-2014, 05:44 AM
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Having a lot of issues, need to get to the bottom of this

Okay so im gonna list all my problems in a chronological order,

First, in the winter, a loud buzzing noise started when turning the key to the wts position, this noise still occurs, just not when the truck is still warm.

Next, lights are dimming when going down to an idle, then brighten when rpms get above 1k

Then, o/d light started flashing, had a slip only when i powerbraked the rpms up to around 1200, then let it back to an idle and then drove.

Transmission was rebuilt, same problem, but diffrent code being shown.

The same thing above happend about 3 times, same problem, diffrent code.

The slip only occurs when the trans is in drive, not when in 1 or 2.

Also occurs very frequently in 4x4, much more then 2x4.

My trans is under warranty, but the guy really isint sure whats wrong so he just keeps replacing the sensors. He said his next try is to look in the drum.

Also, now when the o/d light flashes and i shift into neutral or park, it goes into high idle for 2-3 seconds.

So my question is, does anyone have any idea what may be wrong? Im tired of going back and forth to the tranny shop.
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Old 06-19-2014, 09:06 AM
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I am not sure about the other issues you are having but the lights dimming seems to be your alternator is on its way out. I would have it tested or monitor your voltage while your driving.

Now I may be way off but if you are having electrical power issues this could be causing the other problems that you are seeing. If the PCM and and other sensors are not getting the proper power then the signals could be getting corrupted and causing issues.
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Old 06-19-2014, 10:08 AM
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Thats kind of what im thinking.
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Old 06-19-2014, 10:09 AM
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i agree with will.
start with the charging system and make sure everything is working.

all the electronic crap doesnt work coreectly when not getting enough power.

heck my dang quad wont even run if the batteries low
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Old 06-19-2014, 03:24 PM
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Should i just start voltage testing things?
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Old 06-19-2014, 04:48 PM
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check the grounds/ positive cables.

how old are the batteries? possible bad cell?

check alternator output.
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Old 06-19-2014, 04:52 PM
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ALTERNATOR LIKE THEY SAID
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Old 06-19-2014, 06:18 PM
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How do i check alternator output?
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Old 06-19-2014, 06:38 PM
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It should be putting out around 14V while running.

If it's not than its time for a new one
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Old 06-19-2014, 08:39 PM
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Yup, should be 13.5-14.5

Sent from AutoGuide.com Free App
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