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Old 06-13-2015, 05:23 PM   #1
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Loss of power in 2001 GT?

Okay, so my car feels as if I've lost half of my power? I used to be able to press the ha and go (throw you back in your seat) now I can be going no faster than 45 floor it and the car won't even downshift, and when it doesn't it doesn't throw you back in your seat like it used to?

I've had the transmission rebuilt, spark plugs are good, O2 sensors are good, all the fluids are fine, and the car runs fine. It just feels as if Im not even pressing the accelerator. I've seafoamed it and used the injector cleaner and all. The fuel injectors are the only thing I haven't physically checked and even then I don't see how that would effect the shifting? Possibly the computer? Get it retuned?

*and I don't race or even speed for that matter, but I do take it to the strip from time to time. It's just recently I felt the power loss and started experimenting and realizing that flooring it basically does nothing.

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Old 06-13-2015, 07:56 PM   #2
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I'm assuming from your post that you have an automatic transmission. It should be "kicking down" to a lower gear if you give it wide open throttle while cruising at 45 mph. That may be something to ask the shop that rebuilt the transmission about.
As for your performance loss, I would begin the diagnosis by checking for any stored trouble codes and also have your charging system tested.
You mentioned that you have checked some of the tune up items, did you clean the Mass Air Flow sensor and replace the fuel filter?

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Old 06-14-2015, 10:33 AM   #3
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I agree with Stray, scan it even if your check engine light is not on, there could be a stored transmission or engine code
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