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Knock noise at startup

Zig

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I can leave the in N without any breaks and will not move
Ok… so if you park and shutdown and leave it in N and don’t use the parking brake and restart it do you get the knock and then the movement or the movement first and then the knock?
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Zig

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I thank You can’t start the when is it in N
Must be in the prndl ? If you leave the car in neutral and don’t apply the brake is one able to freely (once the force applied to the vehicle overcomes the weight ) move it or is it locked in place?
 

TXGT29

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So I noticed something similar to this the other day. If I drive somewhere to run an errand, come back after a few minutes and do auto start, and I hear a "clank" sound. Seems like car lunges.

Someone on another group was saying it's normal with the transmission and it's something to lock in the car from moving forward or backwards. Not sure if thats the sound i hear. And it doesnt occur if car has been sitting for a while.

Just seems weird for car to move in park with e-brake on.

Thanks
 

Ford Motor Company

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I have this issue too, the car jerk forward and backward sometimes a little bit. I went to them and they said we have 2 or 3 cars have the same issue. They call me after 2 days and told me they called Ford engineer's and they said that normal and don’t do any thing or don’t try to fixing it, because of that the dealer told me they can’t do anything or try to open anything to know what is the issue.
Hi there! If you'd like, I can look into your concerns on my end. Please send over a DM with your VIN and Ford dealer info!
 
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YouYes

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So I noticed something similar to this the other day. If I drive somewhere to run an errand, come back after a few minutes and do auto start, and I hear a "clank" sound. Seems like car lunges.

Someone on another group was saying it's normal with the transmission and it's something to lock in the car from moving forward or backwards. Not sure if thats the sound i hear. And it doesnt occur if car has been sitting for a while.

Just seems weird for car to move in park with e-brake on.

Thanks
That’s exactly what im facing. The sound only appears when the car was started recently, otherwise, no clank
This is a video of my startup, hopefully you can hear it
 


Zig

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That’s exactly what im facing. The sound only appears when the car was started recently, otherwise, no clank
This is a video of my startup, hopefully you can hear it
That sounds like a console / interlock / safety solenoid - automatic transmission
 

Zig

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TXGT29

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Yeah, something similar. Going to try what is suggested earlier in moving slowly thru gears, sitting in neutral a second, then into park. Especially on short trips.
 

Youssef1416

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Hi. looks like i’ve got same problem as you have. After start up, these noise and shock comes immediately from underneath the car. Wonder where it’s comming from and why these issues are happening. Just guessing it’s from the transmission and feels like it isn’t normal.
Have you found the cause of the problem?
 

Gregs24

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Hello. No it doesn’t jerk. There’s only shock. I always do those sequences before stopping the engine.
My sequence is switch to neutral from drive or reverse and pull the e-brake and let go of the brake paddle to let the car settle on it’s own weight then press the brake again and switch to park.
And this shock problems comes up almost more then a half times when I start up the engine
Not sure why you carry out that sequence? Just put into park and stop the engine.

What you are doing when you stop in neutral and then put on the brake means when you put it into park the parking pawl is trying to engage but there is no slack in the transmission because the wheels are locked (by the brakes). Just put into park first, then shut down, then apply the parking brake. You may find the sound is then gone on restart.

This is what the manual says:

S650 Mustang Knock noise at startup sto
 

Zig

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Not sure why you carry out that sequence? Just put into park and stop the engine.

What you are doing when you stop in neutral and then put on the brake means when you put it into park the parking pawl is trying to engage but there is no slack in the transmission because the wheels are locked (by the brakes). Just put into park first, then shut down, then apply the parking brake. You may find the sound is then gone on restart.

This is what the manual says:

stop.jpg
Although your recommended order is contrary to the cited source.

Park, brake, off - or otherwise known as, come to a complete stop, while holding the brake pedal depressed, change the transmission gear into park, while continuing to depress the brake pedal, engage the park brake, upon completion of park brake engagement release pressure that is applied to the brake pedal.

on start up - depress brake pedal, release park brake, while continuing to depress brake pedal select transmission gear, release brake pedal
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