Weird Acceleration noise of 2013 v6 Mustang!!!!!!!Please help!!!! - Page 2 - Mustang Evolution

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Old 03-02-2013, 03:20 AM   #36
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okay, so it feels like after I release the brake and step on the gas, the brake still slightly kissing the plate, thus cause a sound like "Da!" before it completely separates from the plate.(That's just how I feel about the sound and bumping, may not be real scenario or problem) After all, it explains for the reason why car speeds up a little after the sound and bump. Every morning when I fire the car and start driving, the first 0.1-0.2 mile never have that sound. It's just annoying. Mustang is the dream car for me before I came to US (I am a international student study at U of Maryland). But now...
Well that sounds like sticking brake calipers. Keep taking it back to the dealer. Have a tech ride with you.
Sometimes you can get an independent shop to diagnose the problem for you and you can take that to the dealer.
My mechanic does that but I'm in Calif. Try White Lightnings suggestion of pulling the #47 fuse. Also turn your key to the on position but don't start the car. Slowly push your gas pedal all the way to the floor then slowly release it. Then start your car.

Do the fuse first. Once you've done these drive your car aggressively for 10 to 20 miles around town. Don't get a ticket.
I personally don't believe this will fix your problem but worth a try.
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Old 03-02-2013, 07:34 AM   #37
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Well that sounds like sticking brake calipers. Keep taking it back to the dealer. Have a tech ride with you.
Sometimes you can get an independent shop to diagnose the problem for you and you can take that to the dealer.
My mechanic does that but I'm in Calif. Try White Lightnings suggestion of pulling the #47 fuse. Also turn your key to the on position but don't start the car. Slowly push your gas pedal all the way to the floor then slowly release it. Then start your car.

Do the fuse first. Once you've done these drive your car aggressively for 10 to 20 miles around town. Don't get a ticket.
I personally don't believe this will fix your problem but worth a try.
It more of a taped on band aid. It's a hardware issue fixed by software. You checked your rear end fluid lately? Got a breather valve just puking the stuf and gotta take it in for a replace. Could be your problem too? I'm hoping with a tuner my hesitation will go away. It's gotta be the trans or rear end. Too bad all this is 70% of the drivetrain
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Old 03-26-2013, 11:58 PM   #38
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Sorry about the delay guys, I've been quite busy about the school these days. I didn't unplug fuse #47, cuz I didn't know how to (by hand? with tools?) However, I am sure about one thing now. The car didn't "click or bump" when I completely stop it (not moving at all)and then take off. It only happens when I "ALMOST" stop the car (still moving at a very low speed---speed like I walk) and try to accelerate from that. it feels like the gears suddenly kicks in(But there is no shifting). I was gonna take it to the dealer, however, the sound (or bump ) disappeared that day T T, and appeared again after that!!!! I also have to say that sometimes it was there and sometimes it wasn't there, which makes me annoyed.....Somebody help.....
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Old 03-27-2013, 09:47 AM   #39
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Probably just a brake disc dragging

It could be a brake disc dragging. Get the dealer to put it on the lift and check for a sticking disc pad. Your symptoms all point to just that.

I have a 2012 with the Automatic and 2.73 ratio gears and have no problems at all. No lag, No noise, Crisp shifting. completely silent.

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Old 03-27-2013, 10:37 AM   #40
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Also, My MPG never goes up than17 even though driving on the high way, does it has anything to do the friction caused by sticking brake?
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Old 03-27-2013, 12:02 PM   #41
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Yep. What it is from constant reading on here is driveshaft play and the auto with 2.73 gears. Alot have this problem but people think we are crazy because they don't pay this much attention to the car. New gears, aluminum shaft, intake or a tune will fix this. The auto in the v6 and the engine being a Ti-VCT has to slowly decide which gear and at which speed to be in. It gets confused since at idle it is in 2nd (least mine is) I counted the down shifts. Then one you go it is in first then shifts back up like normal.
if you play with the wanna-be-manual 1-2-3 part, and you downshift, it'll make that clunking noise.
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Old 03-27-2013, 02:20 PM   #42
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It may not be that

You say it does not do it every time, Being intermittent and not all of the time I would not think it would mess up your MPG.

Go to your Ford dealer and test drive a car like yours and see if the one you drive acts like your car. Get a friend in a chevy or something to take you.

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Old 03-27-2013, 09:57 PM   #43
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Are you resetting the mileage computer every fill up?
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Old 03-28-2013, 02:37 AM   #44
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Ok, i'm really lazy and I don't like to read...I read the first post, and I have the same exact problem. What was the solution/answer that everyone came to. More info - (My car stays in 2nd gear when slowing down to a stop, then at a stop, and accelerating again, it almost never goes into first) As the first poster described.
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Old 03-28-2013, 08:48 PM   #45
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Hello everyone:
So I took my Mustang to my dealer today and had a guy ride with me. They finally admitted and noticed that problem. They think that has sth to do with the "hard transmission engagement". I will post the official diagnose report once I get my car back. Thanks everyone for patiently helping me.
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Old 03-28-2013, 09:20 PM   #46
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Hello everyone:
So I took my Mustang to my dealer today and had a guy ride with me. They finally admitted and noticed that problem. They think that has sth to do with the "hard transmission engagement". I will post the official diagnose report once I get my car back. Thanks everyone for patiently helping me.
Awesome, i'll be waiting to here what they say.
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Old 03-29-2013, 01:22 PM   #47
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Hello everyone:
So I took my Mustang to my dealer today and had a guy ride with me. They finally admitted and noticed that problem. They think that has sth to do with the "hard transmission engagement". I will post the official diagnose report once I get my car back. Thanks everyone for patiently helping me.
Excellent. I've noticed a slight sound/bumping when not coming to a complete stop. I think it's because the Auto doesn't shift to 1st til very low speed. Then when you step on the gas it downshifts . Seems normal but the wife's Flex doesn't do this.
What's the need for a different transmission other than hers is a 5 speed.

---------- Post added at 10:22 AM ---------- Previous post was at 10:19 AM ----------

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Ok, i'm really lazy and I don't like to read...I read the first post, and I have the same exact problem. What was the solution/answer that everyone came to. More info - (My car stays in 2nd gear when slowing down to a stop, then at a stop, and accelerating again, it almost never goes into first) As the first poster described.
You sure? Have you completely stopped and then counted the shifts? Give it more throttle and see what happens.
Drive it harder for awhile for adaptive learning. If a 11/12 drive around with grade assist on for a few days. Always take it off on the freeway. If 13/14 use S mode but don't shift it up n down with the buttons let it shift itself.
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Old 03-29-2013, 01:55 PM   #48
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Excellent. I've noticed a slight sound/bumping when not coming to a complete stop. I think it's because the Auto doesn't shift to 1st til very low speed. Then when you step on the gas it downshifts . Seems normal but the wife's Flex doesn't do this.
What's the need for a different transmission other than hers is a 5 speed.

---------- Post added at 10:22 AM ---------- Previous post was at 10:19 AM ----------



You sure? Have you completely stopped and then counted the shifts? Give it more throttle and see what happens.
Drive it harder for awhile for adaptive learning. If a 11/12 drive around with grade assist on for a few days. Always take it off on the freeway. If 13/14 use S mode but don't shift it up n down with the buttons let it shift itself.
I don't listen to them, if I put it in sport mode, it displays which gears I am in on the dash. For normal city driving, it almost never shifts to first. I don't know about hwy. But it does make that clicking noise.

Actually, I have a video of it, I took this video for completely unrelated reasons, but now that you mention it, I think I may have captured the noise.

Noise is at 0:15 and 0:50 It's a v6 automatic, was in Drive, and was not shifting at all.

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Old 03-29-2013, 07:14 PM   #49
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Very strange indeed

I thought the sound could have been a brake disc dragging but it does not make the sound all of the time.

Take you video to your dealer and see what they say.

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Old 03-29-2013, 11:03 PM   #50
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A BAD NEWS!
So today the dealer call me to get my car back. However, unlike what the guy who ride with me yesterday said, the transmission tech says "it is normal when the car is cold". Since I don't know how to upload a pic of the report here, I just type everything here.
"1238 transmission jerks shift hard test drive vehicle when cold and at warm up transmission operates normal perform computer diagnosis no trouble codes found check calibration no later update check fluid level and condition, top off fluid level"

It sounds like BS to me because:
The problems happens when the car is somewhat warmed up, not cold.
The guy who test drive with me wasn't the guy who repair my car, transmission tech may not experience what's going on
I personally don't believe that's a transmission problem because the rpm looks good and smooth and there is no shift when that problem happens.

Anyway, I am going to the dealer next Monday. This is exhausted since I've been there 4 times and every time it was the same result.
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Old 03-29-2013, 11:13 PM   #51
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A BAD NEWS!
So today the dealer call me to get my car back. However, unlike what the guy who ride with me yesterday said, the transmission tech says "it is normal when the car is cold". Since I don't know how to upload a pic of the report here, I just type everything here.
"1238 transmission jerks shift hard test drive vehicle when cold and at warm up transmission operates normal perform computer diagnosis no trouble codes found check calibration no later update check fluid level and condition, top off fluid level"

It sounds like BS to me because:
The problems happens when the car is somewhat warmed up, not cold.
The guy who test drive with me wasn't the guy who repair my car, transmission tech may not experience what's going on
I personally don't believe that's a transmission problem because the rpm looks good and smooth and there is no shift when that problem happens.

Anyway, I am going to the dealer next Monday. This is exhausted since I've been there 4 times and every time it was the same result.
Watch it on fluid checks and fills. Trust me, I fixed my tsb myself and let me tell you, checking a rear end and filling it up is the biggest pain in my *** to date. Even with our car lift. It may say they did but unless you do heck before and after there is no real way of knowing. Plus they have to drop the transmission pan to check it unless its a manual.
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Old 03-29-2013, 11:18 PM   #52
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Well, the real problem now is what the hell cause the problem. My guess is they are not able to explain that noise so they just write **** on that report try to ****ting me.
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Old 03-30-2013, 07:36 AM   #53
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Well, the real problem now is what the hell cause the problem. My guess is they are not able to explain that noise so they just write **** on that report try to ****ting me.
I replaced my rear end fluid and breather cap as states in a rear end tsb. It fixed a majority of the weird problems. But the small problems has to be in tranny or shaft. But I don't have the noise anymore. I was really low in fluid ( used half the bottle)
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Old 03-30-2013, 10:10 AM   #54
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I don't listen to them, if I put it in sport mode, it displays which gears I am in on the dash. For normal city driving, it almost never shifts to first. I don't know about hwy. But it does make that clicking noise.

Actually, I have a video of it, I took this video for completely unrelated reasons, but now that you mention it, I think I may have captured the noise.

Noise is at 0:15 and 0:50 It's a v6 automatic, was in Drive, and was not shifting at all.

If your car doesn't shift to first when you come to a stop or wot from 15mph or below then something is wrong with the programming. As for the noise take it to the dealer and tell them you're not picking it up til it's fixed. If you watch the video at :50 you hadn't even started moving yet and the noise is there. This sound is not normal.
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Old 03-30-2013, 10:16 AM   #55
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A BAD NEWS!
So today the dealer call me to get my car back. However, unlike what the guy who ride with me yesterday said, the transmission tech says "it is normal when the car is cold". .

Total BS
I wouldn't have left until the Service Tech got in my car and acknowledged the problem, Here's the thing. When they admit a problem make sure it's in the initial report that THEY did hear it etc. I've had them do that and still say Customer says. Then it comes back can't duplicate problem. They do this to avoid Lemon Laws. I just keep taking it back til they get it right.
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Old 03-30-2013, 01:58 PM   #56
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The service got in my car and acknowledged that problem, but he think that's a transmission prob and find a transmission specialist to test drive it on his own. That trans tech didn't really know what's going on. I guess I need to have several guys sitting in the car to find that problem. Also, the heavier the car loads, the more likely the problem occurs.
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Old 04-02-2013, 08:25 AM   #57
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The service got in my car and acknowledged that problem, but he think that's a transmission prob and find a transmission specialist to test drive it on his own. That trans tech didn't really know what's going on. I guess I need to have several guys sitting in the car to find that problem. Also, the heavier the car loads, the more likely the problem occurs.
You need to go back to the same service tech and tell him it's still there and not normal. If this is where you bought the car then talk to the owner. Don't take no for an answer. Keep at it.
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Old 04-02-2013, 10:00 AM   #58
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I am at the dealer now. A guy just ride with me and says that's coming from the rear end. He says Ford thinks that's normal and he is going to show me some kind of official documents.
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Old 04-02-2013, 12:20 PM   #59
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I am at the dealer now. A guy just ride with me and says that's coming from the rear end. He says Ford thinks that's normal and he is going to show me some kind of official documents.
If its normal why doesn't mine do it or my buddies or a thousand other Mustangs. That noise is loud and annoying. Don't fall for it.
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Old 04-02-2013, 03:25 PM   #60
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If its normal why doesn't mine do it or my buddies or a thousand other Mustangs. That noise is loud and annoying. Don't fall for it.
Because their " its normal" usually means they have no ****ing clue what's wrong! Lol. When my lca's needed replacing that's what they told me also. I went to another dealer and within 2 mins they knew it was a bad set of lca's. Don't stand for it if you believe something is wrong!
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Old 04-02-2013, 03:38 PM   #61
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The weird thing just happens. The tech showed me a report about the carbon fiber limited slip differential, it says for Gts and Shelby, the noise comes from the racing carbon fiber clutches. They may exhibit a chatter or moan noise when making sharp turns at low speed. However, mine is a v6 and I don't need to make turns to let that happen. So I talk to my salesman and ask a test drive for a brand new v6. The shocking thing is that new car has that noise too! It just better than mine because mine is louder and accompanied with a little bump. What can I say now?
My salesman says they did everything to help me and I need to talk to somebody in the upper class in Ford to inspect my car's problem.
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Old 04-02-2013, 05:18 PM   #62
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And also, do I really need to go to the dealer where I got the car from to inspect and solve the problem, can I go to other Ford service Center and let them take a look at my car?
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Old 04-02-2013, 05:42 PM   #63
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I went to another dealer because the one where I bought the car couldn't find the problem. I do all my servicing at the other dealer now.

---------- Post added at 06:42 PM ---------- Previous post was at 06:40 PM ----------

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The weird thing just happens. The tech showed me a report about the carbon fiber limited slip differential, it says for Gts and Shelby, the noise comes from the racing carbon fiber clutches. They may exhibit a chatter or moan noise when making sharp turns at low speed. However, mine is a v6 and I don't need to make turns to let that happen. So I talk to my salesman and ask a test drive for a brand new v6. The shocking thing is that new car has that noise too! It just better than mine because mine is louder and accompanied with a little bump. What can I say now?
My salesman says they did everything to help me and I need to talk to somebody in the upper class in Ford to inspect my car's problem.
Get a second opinion from another dealer if your not satisfied!
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Old 04-02-2013, 06:10 PM   #64
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Now I called the Ford and told them this can not be resolved at the dealership level, cuz these people keep telling me this is normal with wrong information. The guy on the phone says he is going to escalate this to local manager and they should be contacting me in 2 business days.
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Old 04-02-2013, 06:57 PM   #65
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Ok, a few things I want to add that I have found out from personal experience. First off, I would go to a second dealer in the area and get an opinion from a second tech. It's always good to get a second opinion. Might even go to an independent tech.... I have notices that there seems to be some "slack" in the rear gears, that would be the initial "click" or "clank" that you hear. This can be most easily herd if you sit still with no break applied and then shift from N to D... I suspect this "slack" to be in the pinion gear, i have suspended the rear end and manually rotated the drive shaft to recreate this with the car off and can be certain that the noise comes from the rear diff.... I have 3.73 gears and still get this noise so FRPP gears wont fix it unfortunately.... I also have an aluminum one piece drive shaft and that does not fix it either, actually it makes the sound louder because it resonates slightly through the aluminum one piece tube easily and there is no kind of rubber dampener.... there have been lots of discussion about the clank, especially from people that just noticed it when they put in there new drive shaft in. I am sorry to say but it seems to be "normal".

As for your car feeling sluggish off the line for a moment..... I have to ask, Is this your first automatic car? Often manual drivers feel this sluggishness because it does not happen in a manual......... What I think you are feeling is the time it takes for the torque convertor to lock up...the torque convertor is filled with fluid that, as the pump spins (driven by the motor) it pushes fluid into the convertor which then turns the trans and eventually the drive shaft. Here is the "important" part... the convertor is also bolted to the lockup plate, once the convertor has reached a certain speed the lock-up plate opens up and makes a solid lock that more efficiently transfers power. What I think you are feeling is the sluggish get up that is a result of the time it takes for the torque convertor to fully fill and engage the lock up plate.

And thats what I think is going on here lol. I attached a link to a video that dissects the torque convertor very well and shows it's operation, I would recommend taking a look if your lost in the explanation. the arrows represent the flow of fluid


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Old 04-02-2013, 08:25 PM   #66
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Well Rebeltx,
Thank you first for showing me the animation. This is not my first time to drive an automatic car. Except the car I drove in the driving school, cars I used to drive were all auto. I used to drive a VW Tiguan and a mazda 3. I admit these cars are sluggish when take off, but they do not have a clicking noise when taking off. Plus, now the mustang also exhibit a bumping and shaking when making that noise. I believe that noise comes from the rear because it seems to be worse and happens more frequently when the car just get a full tank of gas and when the rear seats are occupied. And I think I do need to have a 2nd dealer to check it.
I still love my mustang besides that problem. It was my dreaming car when I was in China.
Thanks again for providing me with these information and sorry about my crappy English.
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Old 04-02-2013, 08:31 PM   #67
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Ok, a few things I want to add that I have found out from personal experience. First off, I would go to a second dealer in the area and get an opinion from a second tech. It's always good to get a second opinion. Might even go to an independent tech.... I have notices that there seems to be some "slack" in the rear gears, that would be the initial "click" or "clank" that you hear. This can be most easily herd if you sit still with no break applied and then shift from N to D... I suspect this "slack" to be in the pinion gear, i have suspended the rear end and manually rotated the drive shaft to recreate this with the car off and can be certain that the noise comes from the rear diff.... I have 3.73 gears and still get this noise so FRPP gears wont fix it unfortunately.... I also have an aluminum one piece drive shaft and that does not fix it either, actually it makes the sound louder because it resonates slightly through the aluminum one piece tube easily and there is no kind of rubber dampener.... there have been lots of discussion about the clank, especially from people that just noticed it when they put in there new drive shaft in. I am sorry to say but it seems to be "normal".

As for your car feeling sluggish off the line for a moment..... I have to ask, Is this your first automatic car? Often manual drivers feel this sluggishness because it does not happen in a manual......... What I think you are feeling is the time it takes for the torque convertor to lock up...the torque convertor is filled with fluid that, as the pump spins (driven by the motor) it pushes fluid into the convertor which then turns the trans and eventually the drive shaft. Here is the "important" part... the convertor is also bolted to the lockup plate, once the convertor has reached a certain speed the lock-up plate opens up and makes a solid lock that more efficiently transfers power. What I think you are feeling is the sluggish get up that is a result of the time it takes for the torque convertor to fully fill and engage the lock up plate.

And thats what I think is going on here lol. I attached a link to a video that dissects the torque convertor very well and shows it's operation, I would recommend taking a look if your lost in the explanation. the arrows represent the flow of fluid

Excellent. Great explanation of possibilities!
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Old 04-02-2013, 08:40 PM   #68
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maybe mention the checking the rear upper control arm to a tech. That could easily make bump and squeaks if it has a bad bushing or something.... it would sound like it is coming from the rear dif because it sits directly above it and connects the rear end to the car. Also, if you are hearing a hum or maybe a creak when you just barely roll that would point to a rear end issue if I were the tech... maybe a bad bearing in the differential, that would do it. Or something with one of the rear axles... Since your trans checked out good according to the tech I would be digging in that rear end and all suspension that has to do with it
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Old 04-02-2013, 10:21 PM   #69
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Quote:
Originally Posted by Josephtsai View Post
Well Rebeltx,
Thank you first for showing me the animation. This is not my first time to drive an automatic car. Except the car I drove in the driving school, cars I used to drive were all auto. I used to drive a VW Tiguan and a mazda 3. I admit these cars are sluggish when take off, but they do not have a clicking noise when taking off. Plus, now the mustang also exhibit a bumping and shaking when making that noise. I believe that noise comes from the rear because it seems to be worse and happens more frequently when the car just get a full tank of gas and when the rear seats are occupied. And I think I do need to have a 2nd dealer to check it.
I still love my mustang besides that problem. It was my dreaming car when I was in China.
Thanks again for providing me with these information and sorry about my crappy English.
Lets be honest, you're English is probably better than most Americans
I didnt know you were even foreign until you said so :p
Sorry for the off topic post :p
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Old 04-02-2013, 11:39 PM   #70
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Thanks Rebel great info. Did you listen to his video? That noise is horrible. Can't be normal.
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