V6 (1994-2004) Mustangs Technical discussions on the 3.8L and 3.9L V6 torque monsters

Slow acceleration after coming to a stop.

Old 07-03-2014, 09:29 AM
  #1  
mcan6
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Default Slow acceleration after coming to a stop.

After coming to a complete stop, the car is slow to get up and going again. Even lifting off the brake doesnt get it moving. Once I get to about 25 mph it drives very smoothly. Thought it could be the need for a new fuel filter but after replacing that it is still very slow to accelerate at stop lights. Also used two bottles of fuel injector cleaner. If there is anyone who knows what this might be it would be greatly appreciated.
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Old 07-03-2014, 10:17 AM
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Default Another thing to add.

Was told by a friend that the transmission filter might need to be replaced. Could this be the cause?
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Old 07-03-2014, 11:03 AM
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dawson1112
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Default

I was gonna ask if you tried to manually shift it into first to take off. Sounds like it may not be down shifting correctly. Since that transmission is electronic, there are some factors that could keep it from down shifting properly.

Throttle position sensor
vehicle speed sensor.
Sticking 1-2 shift solenoid
Generally when the filter gets plugged in the trans it causes it to hard shift , or string out the gear longer than it needs to before shifting.
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Old 07-04-2014, 03:32 PM
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Its looking like the transmission fluid is gonna need to be flushed and I'm gonna get a new filter also. If that doesn't work I will consider what you described. Thanks for the reply.
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