Knock Knock

[GTR_Legend]

Guys,

Have had a major service and hada hicas lock bar put in. Over the last couple of days i have started to hear a knock from the back of the car when driving, sounds like somthing swinging in the fuel tank as its not constant but not sure, will have to have a look on the weekend.

Just want to see if any one has had an issue like this and what it was?

cheers,

[sh@un]

First thing I would check is the exhaust- Specifically, make sure the mounts are still secure, or have a look at the clearance the tie-rod has with the exhaust while the car is on the ground now that the hicas set-up has been modified. Whoever installed it may have messed with the exhaust hangers or something in that area. You've gotta use pry bars 'n shit to do work on that stuff. It's tight in there too, with a decent sized 'zorst.

[GTR_Legend]

when i got the major service i also got a high flow cat and 3" front pipe!

mmmm!!!!

[GTR_Legend]

F@CK

Just drove from the city back to work and its heaps worse now.

Seems to be a constant knock when i decelarate, think it could be a diff/driveshaft issue?

[Craved]

jack the car up, have it in gear and try to turn the wheels suddenly.. see if it makes that sound.. that will discover if its drive line related

MAKE sure the handbrake is off for this one, also try it out of gear aswell

also while its up.. shake the exhaust to see if it moves enough to make that noise

[GTR_Legend]

cant jack it up yet but just had a look at the axles, the left one has some play in it, i can move it back and forward

The above is normal operation

[Craved]

is it only this one that does it?

edit - that doesn't explain why noise is only on deceleration though

Edited July 14, 2006 by Craved

[MerlinTheHapyPig]

take it back to mechanic who did service. let them figure it out.

it sounds like it could be some part of the exhaust hitting, maybe the tailshaft or one of the driveshafts. That happened to a friends silvia. I think flange on cat was hitting tailshaft.

[qikstagea]

on deceleration there is no positive force/pressure on the axles. they are spinning loosely, really. Same as why i was getting diff chatter on deceleration and constant speed, but never under load.

Just see if you can get it on a hoist, and anything that moves, move it. Turn it. Shake it. Process of elimination.

[hefer81]

on deceleration there is no positive force/pressure on the axles. they are spinning loosely, really. Same as why i was getting diff chatter on deceleration and constant speed, but never under load.

Just see if you can get it on a hoist, and anything that moves, move it. Turn it. Shake it. Process of elimination.

Check to see if the handbrake cable hasnt come of its bracket as this can occur hitting the tailshaft

[GTR_Legend]

Farkin bad!!!!

Both rear tyres had loose nuts, (were not tightened after service just over 1 week ago).

Lost one nut, another 5/10 k's the wheels would have fallen off.

I didn't even check the wheels at first as it is something simple i thought the workshop would have tightened!

Called and expressed my feelings....

[Duncan]

knocking wheel nuts....they sound sounds *really* bad don't they? nasty too, we had a wheel come off and break 2 studs at targa one year

[racsov500]

nasty

bet someone got a strong lecture at that workshop!

[GTR_Legend]

nasty

bet someone got a strong lecture at that workshop!