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Old 03-31-2012, 06:02 PM
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new here and to my 00' 7.3

Hello every one. I am new here and to diesel's. I will start off with my truck. I just bought a 2000 f250 crew cab 4x4. It has 248,xxx . Needs some work. but its a pretty good truck so far. Today my father in-law and I fixed my steering column and replaced the gear selector. I cleaned the dash out and noticed that two light bulbs were taken out so we put them back in. They were the 4x4 and the break light. Found out the reason they were out. They are stuck on. So i checked the vacuum pump and its not working. But i did not turn the vents on so i am not totally sure that thats not working. But the 4x4 is not working. The hubs and diff work. But i cant get the transfercase to engauge. I do not know why the break light is on yet. The breaks are not very touchy so may need bled. I am not sure. Also my throttle pedal is surging at about 30-40 mph and its very touchy. The guy that last had the truck tracked me down and told me it has a tune in it. Its the super chips performance tune. ( sorry but i hate this tune it sucks lol) My mpgs could probably be better right no i am getting about 16mpg. So there are some of my questions for now. I really appriciate all the help i can get.

Mike H.
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Old 03-31-2012, 06:46 PM
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For the 4wd, the vacuum lines to the hubs tend to crack and leak.
Brake light. ABS light or the P brake light?
If the throttle is surging, it could be a bad Throttle Position Sensor. There's some threads on how to test that.
I'd get rid of the superchips, it's not a great chip.
16MPGs (hand calculated) isn't bad really.
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Old 03-31-2012, 07:44 PM
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Not sure about the break. There are two of them on the dash the one on the right is the only one that has a bulb and thats the one thats on. So I am not sure at the moment. On the (TPS) where is that located at? I know where it is on a car? lol. Just not on my truck. The vacuum lines look to be new. the transfercase is not engauging. The light is stuck on. I dont here the vacuum pump turn on at all when i try to switch it nor do i hear the motor on the (T-Case) turn on ether. If i cant get the tune off i already talked to ford. They said just under 200 to flash it.

Mike
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Old 03-31-2012, 07:57 PM
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the throttle position sensor is on the throttle
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Old 03-31-2012, 08:13 PM
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Add to that one, it is on the throttle pedal inside the cab.

Need to know which brake light is on. It could be as simple as the park brake is slightly pushed.

As far as 4x4, can you verify the truck is in 2x4 while the light is on? The thing could be in 4x4 this whole time (not likely with 16mpg though).
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Old 04-01-2012, 04:53 AM
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I feel stupid now about the (TPS). I never would have thought it to be there. The 4x4 is not ingauged. It is out of 4x4. When you turn the switch inside the cab nothing. You dont hear the motor on the T-case at all. Nor do I hear the vacuum pump. As for the break light the one on the right hand side is on.The left hand side one dont have a bulb in it. The P-break is off completly. Is there a sensor on the P-breake its self that could maybe be bad? Thank you all for all your help so far! I really appriciate it.
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Old 04-01-2012, 07:46 AM
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Yea, there's a sensor on the Pbrake.
The ABS light is orange, the Pbrake is red.
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Old 04-01-2012, 09:44 AM
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These things don't have any kind of mechanical throttle. The pedal only tells the pcm what you want.

I think the 4x4 light is from a sensor on the t-case. I am gonna have to go look at mine to be sure.

The vacuum pump has nothing to do with t-case operation. It only pulls the hubs in to in gauge them.
if it isnt running i would check fuses.

The 4x4 motor, well that is gonna take a little more. We need to find out if it is even getting a signal to operate.
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Old 04-01-2012, 10:27 AM
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To jesilvas its the Pbreak. It is red. Will it go off if i unplug it? so that way i can check to see if thats the problem?

To Turbostang500 we did check power at the motor to the T-case the other day. There is no power. That may be the fuses in the second box by the fuse box. Could both the fuses be bad in the box. The one for high and low range?
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Old 04-01-2012, 10:30 AM
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Mine had issues once. I think if I unplugged it, it stayed on. The Pbrake sensor that is.
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