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Noise under acceleration #4769361 05/27/18 09:48 AM
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inquirer Offline OP
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Car is a Mitsubishi Lancer 1.5L.
Engine: 4A91
Transaxle: F5MGA (Getrag 452)

The incident has happened twice. With the car moving forward a noise that I would compare with the sound of reverse gear (but more abnormal) could be heard. First time loud enough, while in 1st gear, till I came to a stop. Second time it started like during the first time, but it lasted for a whole day. It could be heard with 2nd and 3rd gears engaged too, but again disappeared. (I rolled down the window and paid more attention this time.) It happens only while pressing the throttle and with the throttle depressed stopped immediately.

Any ideas?

Re: Noise under acceleration [Re: inquirer] #4769370 05/27/18 09:54 AM
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WyrTwister Offline
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Is that an automatic or manual . Either way , check fluids .

Just a shot inn the dark .


Wyr
God bless
Re: Noise under acceleration [Re: WyrTwister] #4769380 05/27/18 10:02 AM
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Originally Posted By: WyrTwister
Is that an automatic or manual . Either way , check fluids .

Just a shot inn the dark .


Manual. The noise was quite loud, so something is going on. But on the other hand it disappeared without intervention.

Re: Noise under acceleration [Re: inquirer] #4769393 05/27/18 10:25 AM
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mx5miata Offline
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do you physically feel a mechanical problem with the transmission?

I had a 91 Acura Integra 5spd it made a reverse whining sound under acceleration but it was just a bad ground in the electrical system.


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Re: Noise under acceleration [Re: mx5miata] #4769397 05/27/18 10:34 AM
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Originally Posted By: mx5miata
do you physically feel a mechanical problem with the transmission?

I had a 91 Acura Integra 5spd it made a reverse whining sound under acceleration but it was just a bad ground in the electrical system.


Twice 1st gear was stuck, while the car was not moving, and I was not able to disengage it. I'm not sure how I did it. Maybe I rolled the car? I really can't remember. But that was also coincidental.

Furthermore, sometimes I can't engage reverse. I have to depress the clutch pedal and press it again, but as far as I know this is common.

Re: Noise under acceleration [Re: inquirer] #4769399 05/27/18 10:40 AM
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mx5miata Offline
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its common to reverse and still be slightly rolling when first gear is selected and taking off could just be wear and tear on the gearbox and synchros.

Last edited by mx5miata; 05/27/18 10:41 AM.

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Re: Noise under acceleration [Re: mx5miata] #4769413 05/27/18 10:50 AM
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Originally Posted By: mx5miata
its common to reverse and still be slightly rolling when first gear is selected and taking off could just be wear and tear on the gearbox and synchros.


Yes, that's what I'm wondering. Does the sound come from worn out transaxle parts?

Re: Noise under acceleration [Re: inquirer] #4769417 05/27/18 10:57 AM
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mx5miata Offline
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worn axles make a clunking/rattling sound when taking off


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Re: Noise under acceleration [Re: inquirer] #4769459 05/27/18 12:10 PM
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Another thing I would like to mention, although it may be normal.
When in 5th, the shift stick moves while pressing - depressing the throttle. It does not jump out of gear, but the shift stick visibly moves.
That's something that is happening for a long time, if not since i bought the car.

Re: Noise under acceleration [Re: inquirer] #4769460 05/27/18 12:11 PM
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WyrTwister Offline
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Check fluids . Drain and refill if needed . Look for metal , shiny particles in old fluid .


Wyr
God bless
Re: Noise under acceleration [Re: WyrTwister] #4769464 05/27/18 12:21 PM
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Originally Posted By: WyrTwister
Check fluids . Drain and refill if needed . Look for metal , shiny particles in old fluid .


Had changed it 2 years ago. I had Motul Motylgear 75W-80 (GL4/GL5, but it said it was OK for yellow metals) for a few years and then I changed to Red Line MTL 75W80 GL4. I have the MTL for 2 years now.

The car requires 1.9L. I used 2 bottles of MTL which is 1 quart each, so actually 1.89L both, but I don't think that makes any actual difference.
The mechanic expected for the oil to reach the filling hole, but it didn't, so he used an allen key to check the level of the oil and he said it was OK.

The problem appeared recently. The 1st time it happened was 1 or 2 months ago. No metal particles visible, as far as I can tell, the 2 times the oil was drained.

Re: Noise under acceleration [Re: inquirer] #4769469 05/27/18 12:30 PM
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Kira Offline
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What is the year and mileage of this vehicle?

I'm guessing a worn bearing within the gearbox. Does your long axle have a "mid bearing"?

Any sheet metal touching a moving part would sound like a scraping, not a "reverse gear" noise.

Re: Noise under acceleration [Re: Kira] #4769474 05/27/18 12:42 PM
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Originally Posted By: Kira
What is the year and mileage of this vehicle?

I'm guessing a worn bearing within the gearbox. Does your long axle have a "mid bearing"?

Any sheet metal touching a moving part would sound like a scraping, not a "reverse gear" noise.


Around 70k miles.
I have no idea what bearings the gearbox has.
The noise resembles reverse gear, but there is some rattling. It happens only when the throttle is pressed and stops immediately when I take my foot off. The higher the revs, the higher the pitch of the sound. And as I said it disappears without intervention.

Re: Noise under acceleration [Re: inquirer] #4769481 05/27/18 01:10 PM
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Does this go away as soon as the clutch is depressed? The Getrag 452 is well know for gear rattle, sounding like a box of marbles go dumped in it, all sorts of noise as they age but none are life shortening.
Check the inner CV joint and for loose heat shields and belly pans and check the engine mounts.

Pentosin MTF 2 works better than every other fluid I have tried in Getrag and ZF boxes (that require a GL-4), it is a GL-4 fluid.
This fluid is the answer to cold weather shifting issues found with some units like VW but is able to handle high summer temps with no problem.


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Re: Noise under acceleration [Re: inquirer] #4769485 05/27/18 01:15 PM
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Originally Posted By: inquirer
Originally Posted By: WyrTwister
Is that an automatic or manual . Either way , check fluids .

Just a shot inn the dark .


Manual. The noise was quite loud, so something is going on. But on the other hand it disappeared without intervention.


Is the noise loud on a cold start and then goes away once the motor warms up?

Last edited by JC1; 05/27/18 01:16 PM.

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