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| bry40l |
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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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| mreb |
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could be the cat converter on the exhaust or a stuffed muffler .
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| TimmyA |
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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... 
_________________ 93 Red ED 5spd Manual Build Thread |
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| efxr6wagon |
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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.
_________________ 95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip |
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| phongus |
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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.
_________________ phongus = Post whore 2006 |
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| TimmyA |
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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
_________________ 93 Red ED 5spd Manual Build Thread |
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| phongus |
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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.
_________________ phongus = Post whore 2006 |
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| metasaiah |
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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... ...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. 
_________________ EF2 Fairmont Ghia. AU2 engine running EF gear. Intake, exhaust, injection etc; 8" rear stockies with 265/50R15 rubber. Shiftkitted auto, J3, custom grille and dash cluster and lots of other useless crap... |
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| 87SIlude |
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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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| TimmyA |
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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
_________________ 93 Red ED 5spd Manual Build Thread |
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| 87SIlude |
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Can be easily a couple grand I've been told.
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| XBoNeSX |
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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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| evl_futura |
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Age: 40 Posts: 84 Joined: 18th Nov 2009 Ride: 1995 ford falcon futura ef Location: Kingswood |
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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| 87SIlude |
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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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| bry40l |
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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
_________________ BF XR6 |
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