bad noise

[Matt_vp]

my car has started making a weird rattling scraping noise when i put it in gear but not driving, when i start driving the noise goes away. any suggestion??? doesn't sound like is coming from the gearbox (auto)

[IBLOWN]

oh thats just the worn out buick rattle.

[samuels]

my car has started making a weird rattling scraping noise when i put it in gear but not driving, when i start driving the noise goes away. any suggestion??? doesn't sound like is coming from the gearbox (auto)

flex plate ? almost sounds like a buggered balance shaft bearing,but noise,well in mine anyrate seemed as though it was coming from engine,i refused to believe that it was a balance shaft bearing,so i whipped out the box,and sure enough...cracked flex plate,all the way around the bolt holes,was lucky it didn't break away.it started off as the same noise you are describing,but got worse over a period of a fortnight,you could hear it whilst driving after the fortnight

[Matt_vp]

the idle seems to drop when it makes this noise and the belt tensioner loosens

[hkmonaro68]

Maybe Harmonic Balancer?
At idle it may rattle, then when you have it in gear and a slight load on it, the noise may stop. It the balancer is totally shagged,then it will be noisey all the time.

[Matt_vp]

there is no noise at idle only when it is gear but not driving

[CSL]

yeah it'll be the flywheel, whats happining is at idel in low revs, it has les g forses on it so it can rattle all it wants, once you start moving it gets force (think the gravitron you used to ride at the show) and so you cant hear it, i actually replaced my whole engine because i though i rooted a crank bearing sleave, and then found out it was the flywheel, either that or your converter bolts are loose

what you wanna do is jack the car, throw it on stands, and take off the inspection cover thats kinda in between the auto and the engine, its alot of bolts and ive found undoing the steering rack (2 19mm nut/botls) makes it easier, now their are three bolt holding the converter to the flywheel/drive plate whatever you want to ccall it. get some one to spin the crank (using a 24mm socket and a bit of musle) and check all three bolts if all are tight then you may have to check the actual flywheel, which requires undoing the drive shaft from diff, removing centre bearing holder then sliding out the tail shaft from the auto, make sure you catch the oil, undoing the tranny from the block and corss members and sliding it back,

look a 2nd hand flywheel cost me 40 bucks but i still changed the motor over anyway. get some proffesional opinions but keep an open mind, this has happended to alot of people


p.s sorry about the long post but i am in a typing mood

[Matt_vp]

where is the most common place for the flexplat to crack break???

[samuels]

where is the most common place for the flexplat to crack break???

around the bolt holes...if it's bad enough/cracked..you will be able to see it by just taking the galley plate off and shining torch up in there,you'll see the crack(s) if they are bad...mine was only just hanging on by a couple of millimetres

[Matt_vp]

i had a look at the flex plate and couldn't see any cracks and all 3 bolts where tight enough but i did notice that there is a mark on the flex plate and converter that isn't lined up so i moved it so it would line up. the noise is gone but it made a worse noise until i drive it back and forwards a few time then the noise slowly went away....?

[Frd_thmsn]

there is no noise at idle only when it is gear but not driving

You should have a listen to my noise , I uploaded it in another topic.
Maybe we can compare notes.

[Matt_vp]

yeh i just did. that really dont sound good.. but mine sound way different