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soupflakes 02-10-2009 01:08 PM

Grinding Noise when accelerating
Hey guys, I have an interesting noise problem. When I start to accelerate, I hear kind of a grinding noise, it's hard to describe, almost like a vibration noise, but I do not feel any vibrations. The harder I accelerate the louder the sound gets, but when I am just cruising along it dissappears. Anybody have any ideas? I found a loose heat shield, but fixed that and no change.

ingqman1 02-19-2009 12:15 PM

hey there soup flakes I just got the same problem, I am taking my car in today and I will let you know what they find. Mine is a little bit different in that it starts at about 5 mph and doesn't change much when I accelerate. I have tried putting on the brakes front and back, tried putting it in neutral and shutting it off and still there. I took the wheels of and tried spinning the axle by hand. What I found was the both whell have to be spinning at the same time to make the noise, which leads me to believe that it is in the transmission. I had a throwout bearing go out once in my truck and it sounding just like this. Like a tightly pressed metal on metal sound.

focusmaniaczx3 02-20-2009 08:03 AM

completely normal unless its extremely loud. the gears in our trannsmissions fit together kinda loose so at low rpms and low speeds you can hear them chatter a little bit. i wouldnt worry about it unless it just started making the noise louder than normal then i would get it checked out.

ingqman1 02-20-2009 03:35 PM

For 60k miles it hasn't been normal, now all of a sudden it is normal! I think I will be getting my normal situation taken care of before I need more than just a normal transmission overhaul. No disrespect but grinding is grinding and that creates metal shavings which are bad!

ken6x6 02-20-2009 05:02 PM

dump the trans fluid and see if there is any metal shavings.

focusmaniaczx3 02-20-2009 06:06 PM

well you can do what you want but ive owned 3 foci and put more than 170k miles on my 2000zx3 and its still on original stock tranny. 2 zx3 and 1 svt and ridden in several besides mine and every single one of them have made the same chattering noise. also i would think that if youve been hearing this for 60k miles and are just now starting to worry about it something else has changed to make you worry. if you are convinced there is something wrong with the tranny then do what ken6x6 says and dump the tranny fluid and check for shavings. you would probably find shavings anyway with a high mileage car that more than likely has only once, if ever, had the tranny fluid changed. just a little bit of shavings in there with 50k mile old tranny fluid is ok. lots and lots is bad. but without more information on what it sounds like EXACTLY or where EXACTLY the sound is coming from and if you can FEEL any difference in the way the car drives that is the best advice i can tell you without examining the car in person.

ingqman1 02-27-2009 02:00 AM

soupflakes, I just got my car back, running great now with NO noise, the carrier bearing on the passenger side was bad, not sure what caused it but, my guess would be the prevous owner didn't seem to think that alignment was a big concern! I agree with focusmaniaczx3, if you drive like a normal person the tranny should last almost forever, but I feel your issue is beyond the tranny. If you are a do-it yourselfer get a stethoscope and listin to each component as someone turns the wheels by hand you will be able to tell if it is in the bearings or the tranny, or try a dowel rod if you don't have a stethoscope.

behemoth 02-27-2009 11:37 AM

I just hit the 100k mark and started hearing a similar noise. It is a grinding noise that only happens in gear, any gear between 2k and 4k rpm. I am now starting to hear it while driving on the freeway as well. It does not happen in neutral only while moving. I drive 60miles one way and when I get to work it does not happen. Seems to only happen when cold during short trips.
I replaced the passenger side axle shaft thinking it was the same carrier or jack shaft bearing. No change, I also had clicking while turning, but all cv boots are fine.

I also need a new strut up front they are on order.

It is a 2003 zx3 with the 2.3 5 spd manual.

The transmission fluid that leaked out looked fine no metal.

Any more thoughts or suggestions on this one?

soupflakes 07-09-2009 10:41 PM

Thanks guys, I got the tranny fluid changed, but no difference, the next thing will be the bearing. I will look at it closer, I've put over 15,000 miles on it since I bought it and it still hasn't changed, so it is probably not doing anything horrible, though I do autocross this car, so I'm going to try to get it fixed. Thanks for all the help. Any other ideas are welcome. i'll look at the bearing and see what happens.

mustgofaster 07-10-2009 10:31 PM

Before you spend too much $$$ check your motor mounts. I just did mine for a similar sound. The Passenger side mount was the offender. When you check them, be very particular. The mount that was bad on mine looked fine, but the viscus fluid leaked out somewhere along the line.
I will say that the focus motor mounts are about the easiest I've ever replaced... Took 45 mins for all 3.

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