knocking from my gearbox is it normal
 

hi just brought a 04 mazda rx8 (192) from a mazda dealer it runs very lumpy and there is a knocking coming from the gearbox when the car is hot. i took it back to the dealer they had it for a few days then came back and said it was normal and they all do it could any1 help me! the car has done 18000 surely they are not all like it?

Can you explain the noise with any more detail? What are the situations you hear it? Is is a metallic sound? A crunch/grind sound? What does a "knocking sound" sound like? When does it do it, etc?

The gearbox on this car is noisy as it's right under your elbow, but the noises should be smooth and mechanical sounding.

metal sound
 

the mechanic called it chattering the sound happens every few seconds when it happens you can feel the car jerk. it sound like metal hitting metal it is when the car is ticking over. not when im driving.

It sounds like there isn't enough lubrication in the gearbox to me. They do NOT all do this. My gear box has a whirring noise and that's about it. Otherwise it is very smooth in operation

There are TSBs concerning motor mounts in the car that can cause the gear box to bang around and that might not have been taken care of.

Check here at the TSBs and see if any of them might fit:

http://www.finishlineperformance.com/rx8/bulletins.html

This one in particular:

HESITATION / IDLE VIBRATION DUE TO CRACKED ENGINE MOUNT


There is also a Thermal shield recall that could cause the noises that you are hearing here:

2004 M/T Dynamic Damper Heat Shield Replacement Recall

It could also be that the previous owner beat the snot out of it, and you are looking at a new gear box.

Make sure that the above was taken care of and also make sure that your oil level is full in the gearbox since that traditionally causes chattering, but I'm betting that the problem is a broken motor mount listed under the TSB. Your car should still be under warranty. Also, the powertrain warranty on '04s were extended a year with the thermal damage recall, and if that hasn't been done it should be too.

If you want to find the TSB list, it is in the Tech section of the forum under the DIY subsection. Best of luck.

wow,
all the info and bad info.. where are you,,, is it an auto or manual...

when the car is ticking over means starting???

beers :beer:

the dealer says it is presure building up in the gearbox,

Sell It !
 

According to the dealer 'Its Normal'..
Mine was doing the same thing.
It was recalled for transmission noise, but mine still made noise .

Check on the web for all the major recalls for this car.

This is one of the reasons , I just traded my car in.

Transmission noise is NOT a recall, troll.

wow,
troll vs troll.

who will hit 6 post first..

beers :beer:

This came from http://www-odi.nhtsa.dot.gov/cars/pr...ls/results.cfm

There are four recalls...the second one down is for transmission noise.

Some kind of insulator broke, that could cause fatal crash !!!

Do some research before posting !!!


Make : MAZDA Model : RX8 Year : 2004
Manufacturer : MAZDA NORTH AMERICAN OPERATIONS
NHTSA CAMPAIGN ID Number : 04V074000 Mfr's Report Date : FEB 16, 2004
Component: AIR BAGS:FRONTAL
Potential Number Of Units Affected : 29300

Check to Request Research. Submit below. Get Summary

Make : MAZDA Model : RX8 Year : 2004
Manufacturer : MAZDA NORTH AMERICAN OPERATIONS
NHTSA CAMPAIGN ID Number : 04V075000 Mfr's Report Date : FEB 16, 2004
Component: POWER TRAIN:MANUAL TRANSMISSION
Potential Number Of Units Affected : 12000

Check to Request Research. Submit below. Get Summary

Make : MAZDA Model : RX8 Year : 2004
Manufacturer : MAZDA NORTH AMERICAN OPERATIONS
NHTSA CAMPAIGN ID Number : 05V317000 Mfr's Report Date : JUL 07, 2005
Component: ENGINE AND ENGINE COOLING
Potential Number Of Units Affected : 52000

Check to Request Research. Submit below. Get Summary

Make : MAZDA Model : RX8 Year : 2004
Manufacturer : MAZDA NORTH AMERICAN OPERATIONS
NHTSA CAMPAIGN ID Number : 05V325000 Mfr's Report Date : JUL 18, 2005
Component: SUSPENSION:FRONT:CONTROL ARM:LOWER BALL JOINT
Potential Number Of Units Affected : 27800

Check to Request Research. Submit below. Get Summary

You might want to research a "real" site before posting. First off, your link doesn't work. Second, here is a link to ALL the posted recalls and service bulletins...
http://www.finishlineperformance.com/rx8/bulletins.html

...the garbage you are spouting doesn't exist.