I feel my auto 5.0 GT lost some oomph - Ford Mustang Forum
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post #1 of 39 (permalink) Old 09-18-2015 Thread Starter
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I feel my auto 5.0 GT lost some oomph

Hello friends,

I am a fully non technical guy to begin with, I just love my Mustang.

I have driven it daily for the last 4 years and have put over 68.000 miles on it.

And I have the feeling that it's lost some oomph, I feel it when I start it, before when I put it into D, I had to brake firmly or the car would start advancing inmediately, on a steep uphill it'd move also, now it goes backwards in a steep uphill on d if I don't push the throttle.

My mechanic says the clutch is in perfect condition and he says it's me, that have gotten too comfortable with the huge torque and power it has, but the uphill thing is not subjective.

Consumption remains very similar, haven't felt any difference.

I also have the feeling it's harder for the car to rev up, at first, when I stepped hard on the throttle I had the feeling it was more a projectile than a car, now it takes some time to gain speed...

is it the clutch?

Is it that the engine is "worn out"? I really doubt it, for 68.000 miles (and never been tracked) is nothing for such a huge engine...

Thanks in advance for your expert comments.

cheersssss.

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post #2 of 39 (permalink) Old 09-18-2015
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Not sure man, you can try a tune to get back that pep. If your not tuned, I certainly suggest one. You can always dyno it to see if your numbers are where they should be. That is the only way to really know.


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post #3 of 39 (permalink) Old 09-18-2015
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Are you sure your mechanic was not referring to the clutch packs in the auto transmission? These 6r80's are pretty stout.

Probably due for tune up. Then look into tuning. It makes a big difference on the auto cars. My car tune only was ripping off 12.4's on the stock Nero's.
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post #4 of 39 (permalink) Old 09-18-2015
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What gas are you using? Maybe try 93 octane for a bit if you are not. That plus a tune might help things out a bit.
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post #5 of 39 (permalink) Old 09-18-2015
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I agree with ^^^^ above. Start with a good tune-up using correct and good quality plugs and filters etc. Its amazing how some of these small things add up to a lot of performance loss. Good luck!
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post #6 of 39 (permalink) Old 09-18-2015
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why not try and change the trans fluid? the oem could be worebroke down and not as responsive.

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post #7 of 39 (permalink) Old 09-18-2015
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There isn't exactly a clutch in automatic transmission, but there is a torque converter, which kinda does the same job . . . sounds like it is slipping at idle; I am not sure what might cause that; fluid a little low maybe?

There isn't much of a "tune up" to be done at 68,000 miles, pretty sure the spark plugs are good for at least 100,000 . . . but make sure the air filter is clean or replaced; fuel filter replaced; throttle body cleaned; MAF sensor cleaned . . . that's about it.

Also might be worth clearing the adaptive memory in the computer . . . . unhook the battery for about 20 minutes . . . or I think there is a fuse you can pull, to make that a bit easier. This resets the computer.

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post #8 of 39 (permalink) Old 09-18-2015
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disagree, there are clutches and clutch plates in an auto transmission. the torque converter transfers the fluid to mechanical force and turns the input shaft and pump. not splitting hairs but just sayin.
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post #9 of 39 (permalink) Old 09-18-2015
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Quote:
Originally Posted by JBert View Post
There isn't much of a "tune up" to be done at 68,000 miles, pretty sure the spark plugs are good for at least 100,000
True, but they are usually mighty worn by that mileage, especially if you drive hard.

But it's probably only gonna cause a 1 or 2 hp loss, maybe a slight loss in mpg.

I think it's in the OP's head. His butt dyno needs to be recalibrated. He's used to the power.

Time to start modding.

FYI My '06 with bolt ons feels slow to me. I've had it for too long lol.
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Quote:
Originally Posted by bl817 View Post
disagree, there are clutches and clutch plates in an auto transmission. the torque converter transfers the fluid to mechanical force and turns the input shaft and pump. not splitting hairs but just sayin.
Yep. Torque converter is a fluid coupling. It is actually designed to slip and maintains some degree of slippage up until the ECM commands the torque converter clutch locked. On non-lockup transmissions a torque converter will never achieve a 1:1 transfer of RPM to the transmission. If an engine is steady state cruising at 2000 RPM a non-lockup converter might only spin the transmission input shaft at 1800 or so RPM.
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so what do the clutch plates do?

OP described that car rolls backwards on hills in drive, that sounded like torque converter to me -- not sending through the same amount of torque that it used to at idle
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i think its all magic HA! the auto transmission is a great piece of engineering. it has clutches, clutch plates, a pump, valve bodies, check valves, electronic giszmos etc... it all runs on the fluid pressure. back to the OP's issue, could be degredation of the fluid, adaptive learning as stated above, or also in the mind. "butt dyno needs recalibrated" where do you plug in the tuner?...HAHA good stuff.
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Actually it does sound like a tranny issue - good chance the bands need adjustment and you could prob use a fluid flush - I am no expert but there is slippage in auto transmissions - other than caused by the torque converter unless it has broken internal fins - and you would hear that. You need to do some internet searching on auto transmissions and adjustment - specific to your tranny - good luck.
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Quote:
Originally Posted by JBert View Post
so what do the clutch plates do?

OP described that car rolls backwards on hills in drive, that sounded like torque converter to me -- not sending through the same amount of torque that it used to at idle
The hard part about a post like this is that it's very subjective and without being there to look at and drive the car there is no way to know if there's actually an issue or not. I've driven lots of automatics that can roll backward a bit on an incline when the engine is idling.

There are a several sets of clutches in an automatic transmission and they are applied and released using hydraulic pressure during upshifts and downshifts. When a car is stationary the first gear clutch will be applied but the car can remain stationary because there is no direct mechanical connection between the engine and transmission.

The torque converter clutch typically only engages at cruising speeds. In fact, if you're cruising at a steady 65 mph and tap the gas just enough to see the tach raise just a few hundred RPM it's probably the torque converter clutch disengaging. Anything more and the transmission will probably downshift.
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