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FG xr6 knock under acceleration 

 

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 Post subject: FG xr6 knock under acceleration
Posted: Sun Feb 26, 2012 10:24 am 
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My 2009 fg xr6 occassionally has a knock under acceleration that feels like its from roughly under the drivers seat. I had a vibration at idle from roughly the same spot (rear transmount to exhaust bracket area) with the air con on. When it was serviced last i mentioned it to the dealer of which they have all but sorted it. It does however have this knock from roughly the same area under gentle acceleration. I have had it back to them and they say they can see nothing wrong. Of course when i took them for a ride to try and reproduce the noise it would not do it. Only to drive away and have it do it a few more times. Any ideas? May be from further back eg rear cradle area. It is so random that when it happens you dont get a good chance to listen to it. I would like to get it sorted before warranty runs out and i get stuck with it.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Sun Feb 26, 2012 4:27 pm 
Getting Side Ways
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diff cradle bush.

 

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 Post subject: Re: FG xr6 knock under acceleration
Posted: Tue Feb 28, 2012 1:21 am 
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i actually get a similar sort of noise. sounds like its coming from under the drivers seat or just in front of it (almost as if its the dash). seems to do it when im in drive and got my foot on the brake, like if im waiting at traffic lights. goes away if its in park or as soon as the revs pick up when i take off again. ford cant find anything, been doing my head in for months now.....
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Tue Feb 28, 2012 7:23 pm 
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Benny D wrote:
diff cradle bush.

Any reason that you say this? Have you experienced it? Was it more noticable under gentle acceleration?
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Tue Feb 28, 2012 7:48 pm 
Getting Side Ways
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nitrofgxr6 wrote:
Benny D wrote:
diff cradle bush.

Any reason that you say this? Have you experienced it? Was it more noticable under gentle acceleration?


its probly the most common problem thru all B series and FGs.
with the bush shagged it allowes the diff cradle to move indipendantly from the car so when you say go, it knocks the cradil back a bit.
should be really obvious when coasting in a gear and slightly acceleraing and backing off and accelerating again.

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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 Post subject: Re: FG xr6 knock under acceleration
Posted: Wed Feb 29, 2012 6:01 pm 
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Benny D wrote:
nitrofgxr6 wrote:
Benny D wrote:
diff cradle bush.

Any reason that you say this? Have you experienced it? Was it more noticable under gentle acceleration?


its probly the most common problem thru all B series and FGs.
with the bush shagged it allowes the diff cradle to move indipendantly from the car so when you say go, it knocks the cradil back a bit.
should be really obvious when coasting in a gear and slightly acceleraing and backing off and accelerating again.

Does not do it when coasting and then slightly off and on throttle. Only occassionally when gentle take off from lights. Not a sound if you punch it from a standing start.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Thu Mar 01, 2012 3:47 pm 
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Hi All im new to fordmods :) 8-) and my FG falcon XT does this nearly every time I take off from the lights under lite acceleration so had Furntree gully ford go rite over it and they cant find the cause.
I hope some one finds the cause as it is quite a load knock or thump under the car and doesn't sound normal :shock: :x .
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Fri Mar 02, 2012 7:56 pm 
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fgfalcon wrote:
Hi All im new to fordmods :) 8-) and my FG falcon XT does this nearly every time I take off from the lights under lite acceleration so had Furntree gully ford go rite over it and they cant find the cause.
I hope some one finds the cause as it is quite a load knock or thump under the car and doesn't sound normal :shock: :x .

Glad im not the only one, its driving me frigging nuts, car has only done 25000kms and has prob been doing it since about 17000kms.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Sat Mar 10, 2012 7:07 pm 
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Has anyone had this noise inspected by someone independent other than a ford dealer eg pedders or something? Thinking about getting a differnet set of eyes looking at it.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Sun Apr 01, 2012 6:11 pm 
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Have made a booking at local pedders store to see if it can be found. Will see what the outcome is.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Fri Apr 06, 2012 8:19 am 
Getting Side Ways
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Nitrofgxr6,

Most likley as previously mentioned its the diff cradle bush. I had mine replaced under warranty as it was split and the problem disappeared.

fgfalcon,

Do you have the 5 speed auto? its a known problem that there is a hard "shunt"/ "knock" when changing from 2nd to 3rd in the 5 speeds. I took mine back to ford and they actually said, its just built that way and is quite common!!

Other possible cause is the exhause smacking underneath the transmission housing, mine was (aftermarket) ha it heated up and bent down slightly and no more bang.

cheers

Andrew

 

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 Post subject: Re: FG xr6 knock under acceleration
Posted: Tue Apr 10, 2012 12:42 am 
Getting Side Ways
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andrew, have the zf 6 speed mate. nice transmission to drive with too. will check the exhaust clearance on the transmission housing this up coming weekend, could be a possibillity as it is after market
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Sun Apr 15, 2012 3:49 pm 
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Pedders found nothing to be worn, they did however point out how on the 5 speed autos where the rear trans mount is mounted to trans, it is held by 2 pissy little studs with nuts on them. They cranked these nuts up as tight as possible and so far no noise. Coincidence or not we shall see. Diff cradle bush was fine. After only 26000kms i should hope so.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Sun May 13, 2012 11:16 am 
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Well noise is still there, it did stop for a while after pedders messed with the trans mount but now its back. Looks like it is somehow related to this. Seems that ford have done something on the cheap again and made a problem in an otherwise nice car. It also seems im not the only one having this problem. May have to look at a better way of supporting trans at rear.
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 Post subject: Re: FG xr6 knock under acceleration
Posted: Mon May 14, 2012 10:39 am 
Getting Side Ways
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nitrofgxr6 wrote:
Seems that ford have done something on the cheap again and made a problem in an otherwise nice car.


they have been doing this since 1998 (end of E series). :lol: :lol: :roll:

 

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BA XT V8. Ice Mint. 18" Speedys. XR6T LSD. Full Pacemaker twin 2 1/2inch Stainless Steel system. Custom CAI. Black XR interior with white trimming. Powerbond underdrive kit 25%.
13.65@102mph. 2800 hi-Stall.
230RWKW@5250 rpm. 625NM.

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