Boosted Falcon

it started of as a small bibration whilest accelorating around 1500 to 2000rpm then clearing up now lumps like crazy on idle and vibrates like a Mother F@cker at nearlly every rpm its an au xr8 auto. any ideas???/

Engine mount broken? Wheel nuts done up tight?

Harmonic Balancer. V8's run a 50oz imbalance, slipped balancer = vibrations = dead bearings

will definantly be balancer....they feel like the engine is trying to fly out the bonnet when they go

lol at wheel nuts causing vibrations at idle

LUXO_8 wrote:will definantly be balancer....they feel like the engine is trying to fly out the bonnet when they go

id hope not, it aint no cheap fix..
check engine mounts first

I've had a balancer go on my car. It's exactly what he has described. It will be balancer. Without a doubt

Engine mounts just bang and carry on but not have vibrations like he has described

I've had the balencer let go on a 5L too. Get a timing light and check the base timing to confirm it. Mine slipped by 42° IIRC... shook like a mofo!

I've no idea how to put the AU into self test mode, but a workshop manual will explain the process and give the figure of what the timing should be.

4dlvr wrote:

LUXO_8 wrote:will definantly be balancer....they feel like the engine is trying to fly out the bonnet when they go

id hope not, it aint no cheap fix..
check engine mounts first

Not really, balancers aren't expensive, and aren't hard to change if you have a puller set.

thanks fellas. i went down and had a look at the harmonic balancer it looks abit all over the shop...

Allen they tend to do some damage to other components when they go bezerck, at least they do with i6's

which is why as soon as you notice it, you stop driving it untill you fix it..... no brainer i would have thought

Nah it's like driving a turbo motor untuned - you just get on it occasionally to check it hasn't fixed/tuned itself

hahahaha,

well mine displayed same vibrations one day, had a look, everything seemed fine, took it mechanics, they couldn't find a fault either, till a few weeks of driving later,
thats what i was implying from the beginning, if his gotten to a point where its behaving that badly and his continued to drive it then, his probably got a bit more of a headache than a simple replacement.

Allen wrote:
I've had the balencer let go on a 5L too. Get a timing light and check the base timing to confirm it.

correct... ignition system must be perfectly timed because timing is everything.