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awfull rattle from underneth the car 

 

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 Post subject: awfull rattle from underneth the car
Posted: Thu Jan 06, 2011 3:07 pm 
Getting Side Ways
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i was driving down the inner city bypass in newcastle today and i could hear a loud rattle coming from under the car wen its under load but not wen its reving its like a vibrating rattle that ive never herd before, any ideas wat the rattle is?

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 10:29 am 
Getting Side Ways
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could be the cat converter on the exhaust or a stuffed muffler .
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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 10:57 am 
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I'd vote cat... Under load the motor rocks/vibrates more...

The ceramic comes losses and vibrates on the tin housing... eventually they go C**k-eyed and part block it... Best to fit a metallic cat... like I will one day... 8-)

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 11:04 am 
Getting Side Ways
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Is yours auto transmission? The torque convertor bolts have a habit of coming lose. Fortunately, it's not a major to fix. Just put some Loctite on the threads before tightening them back up.

If the engine is rocking more than normal under load, you could have a failed left (passenger side) motor mount. Again, not a major to fix, but miserable to get at under the intake manifold - need to remove the airbox (3 bolts) to get access.

Hope this helps.

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 11:23 am 
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If it is manual, it could be your thrust bearings. If the thrust bearing is stuffed, the input shaft of the gearbox just vibrates against it. Could also be crank end bearing or something...I've just gone blank...which is a more serious situation.

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 12:57 pm 
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thrust bearing noise usually goes when you press the clutch in yeah?

if its the cat pull up... let the car cool and reach under the side and bang on the cat and see if it rattles... That will eliminate that...

Cheers,
Tim

 

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Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 4:25 pm 
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TimmyA wrote:
thrust bearing noise usually goes when you press the clutch in yeah?

if its the cat pull up... let the car cool and reach under the side and bang on the cat and see if it rattles... That will eliminate that...

Cheers,
Tim


Yeah...usually goes away once you push the clutch in. I get that rattle, but I haven't fixed it...rather annoying.

 

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phongus = Post whore 2006
EL XR6 motor, EL ECU + J3 chip, WADE 1673 Camshaft, 3" S/S intake, Pacy 4480, 2.5" Hi flow cat, 2.5" Lukey exhaust.
Max Power = 144.6 rwkw (03/05/2008)

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 9:00 pm 
Getting Side Ways
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TimmyA wrote:
I'd vote cat... Under load the motor rocks/vibrates more...

The ceramic comes losses and vibrates on the tin housing... eventually they go C**k-eyed and part block it... Best to fit a metallic cat... like I will one day... 8-)


...or remove the cat, apply vigorous use of a mallet to a steel pipe shoved down the cat until the cat doesn't rattle any more. Sweep the floor, refit the cat and enjoy. :mrgreen:

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 9:08 pm 
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Very good method mencioned above.
But when I refit I left the haanger loose. Rattled worse then the cat did haha.

But don't do it its illigal! I just did it so I could drive to get a new one.
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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 11:08 pm 
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It is illegal and in the cities they have detectors to spot cars without a cat... and because we're talking emissions control here... I bet its not really a cheap fine somehow... :?

Cheers,
Tim

 

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93 Red ED 5spd Manual Build Thread

Performance: Complete AUII VCT Wiring & Power Train, Pacey Headers, 2.5" Exhaust, Exedy Clutch, DBA Rotors
Visuals: FG XR Wheel, XR Front, 17's, BA 5 Spd Shifter, BA Ghia Window Switches, NL Cluster
Tunes: 8" Pioneer Sub, JBL Speakers, Clarion Double DIN Headunit

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 Post subject: Re: awfull rattle from underneth the car
Posted: Fri Jan 07, 2011 11:29 pm 
Getting Side Ways
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Can be easily a couple grand I've been told.
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 Post subject: Re: awfull rattle from underneth the car
Posted: Sat Jan 08, 2011 10:05 am 
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I had my AU at mechanics last yr .. having probs he had taken off the cat to do test and put back on ... but when he done this .. he must bent the bar holding it ... cause it made horrible rattle and vibrate through floor when idling at traffic lights ..took to another mechanic few bashes with hammer was all good ... leave ya car idling in neutral ..stick head under car see if knocking ..

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Sat Jan 08, 2011 10:14 am 
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bry40l wrote:
i was driving down the inner city bypass in newcastle today and i could hear a loud rattle coming from under the car wen its under load but not wen its reving its like a vibrating rattle that ive never herd before, any ideas wat the rattle is?


on my ef wagon it turned out to be the exhaust and sometimes like now and then it still does it but doesn't really bother me

so if i was you i would check the exhaust bushes to see if they are worn etc etc

 

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 Post subject: Re: awfull rattle from underneth the car
Posted: Sat Jan 08, 2011 10:21 am 
Getting Side Ways
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The hanger near the cat with 2 studs and 2 10 or 12mm nuts is the usual culprit. Just needs a re tighten. Unless your cat is dying.
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 Post subject: Re: awfull rattle from underneth the car
Posted: Sat Jan 08, 2011 9:35 pm 
Getting Side Ways
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It was my muffler, so ill be getn a 2.5 inch wen I get the money cause the whole systems stufed, and I bashed out the cat on my ol vp commodore paddock basher and made it go worse and a dash board light came on, plus yea I herd its a big fine, thanks for the help

 

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xr8 snorkel,typhoon lower snorkel,territory intake pipe,20% underdrive kit,pacemaker extractors,high flow cat,xforce exhaust,t56 conversion hd turbo clutch/ flywheel,m86 3.45 lsd,custom tune187.1rwkw as an auto

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