4.6L (1996-2004 Modular) Mustang Technical discussions on 1996-2004 4.6 Liter Modular Motors (2V and 4V) within.

changed my car to 5 speed and now wont idle

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Old 02-19-2009, 09:52 PM
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forpointsick
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Default changed my car to 5 speed and now wont idle

i changed my car to a 5 speed tr3650 from a 4 speed auto.now my car will idle at around 2500 to 3000 and drop down after a couple seconds every time a hit the throttle and my speedometer is of by around 50 mph my check engine light is on and i have 4 codes all for the transmission and my overdrive light keeps flashing
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Old 02-19-2009, 10:03 PM
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Aereon
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I hope you're not trying to drive the car without having it retuned. I went from auto to t56, after the tune I have had no problems.
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Old 02-19-2009, 11:39 PM
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swarthyfellow
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Do quote, but i think sniper tuning can fix it. check them out. That was my plan if i when i was gona do the swap to a manual. Let me know if it worked. That would be nice to know.
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Old 02-20-2009, 06:08 PM
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Kmoran81
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I did the same swap on my 02 GT. You will either need a new ECM or Sniper tuner and all the probems will be fixed providing you did the swap correctly. (New tranny wiring harness)
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Old 02-21-2009, 02:45 PM
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Pauly_B
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Originally Posted by Aereon
I hope you're not trying to drive the car without having it retuned. I went from auto to t56, after the tune I have had no problems.
Did u have a chip or ford reflash?
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Old 02-21-2009, 02:48 PM
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Pauly_B
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Originally Posted by forpointsick
i changed my car to a 5 speed tr3650 from a 4 speed auto.now my car will idle at around 2500 to 3000 and drop down after a couple seconds every time a hit the throttle and my speedometer is of by around 50 mph my check engine light is on and i have 4 codes all for the transmission and my overdrive light keeps flashing
Are you still using the Auto ECM? did you change your wiring harness?
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Old 02-21-2009, 05:40 PM
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forpointsick
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i took my car to ford and they said i have to get a new ecu and i used my old v6 transmission harness i havnt been able to find a new ecu the dealership told me i have to get a ecu out of a 2001 gt if i get a new ecu will the dealership have to program it
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Old 02-22-2009, 03:21 PM
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Pauly_B
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Originally Posted by forpointsick
i took my car to ford and they said i have to get a new ecu and i used my old v6 transmission harness i havnt been able to find a new ecu the dealership told me i have to get a ecu out of a 2001 gt if i get a new ecu will the dealership have to program it

LOL do you have a handhold programmer?
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Old 02-22-2009, 11:22 PM
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Aereon
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Originally Posted by Pauly_B
Are you still using the Auto ECM? did you change your wiring harness?
it's a reflash of the stock ecu.
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Old 02-23-2009, 03:34 PM
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forpointsick
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i have a sct tuner
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