I have a 1.8 petrol Design on an 08, it has 38k on the clock and has started to make a loud rattle noise over the last few months at the top of the engine area, and it seems to be getting worse.
The noise comes and goes almost as if it is being switched on and off with a button, when its not making the noise the car sounds lovely and quiet, then the noise starts and it sounds just like a diesel, the next minute the noise stops again...
I mentioned it to the Vauxhall dealer when it had its three year service and they said that it should get better with an oil change, which they actually did on the service anyway, but it didnt make much difference.
Now the warranty has expired so any repairs are going to cost me.
Any one come across this before and know what the problem might be?
I did put a Wynn's Tappet treatment in just in case it worked but again, no noticable difference, plus I have run a bottle of Redex through in case it was an injector noise.
It also appears that this 1.8 model does'nt have an EGR valve either which I have heard can cause problems.
One other thing is that at times it feels very under powered, then the next minute it flies along, but it has been like that the last two and a half years we've owned it, so dont think that will be part of the same fault though...
Any help very much appreciated....
The noise comes and goes almost as if it is being switched on and off with a button, when its not making the noise the car sounds lovely and quiet, then the noise starts and it sounds just like a diesel, the next minute the noise stops again...
I mentioned it to the Vauxhall dealer when it had its three year service and they said that it should get better with an oil change, which they actually did on the service anyway, but it didnt make much difference.
Now the warranty has expired so any repairs are going to cost me.

Any one come across this before and know what the problem might be?
I did put a Wynn's Tappet treatment in just in case it worked but again, no noticable difference, plus I have run a bottle of Redex through in case it was an injector noise.
It also appears that this 1.8 model does'nt have an EGR valve either which I have heard can cause problems.
One other thing is that at times it feels very under powered, then the next minute it flies along, but it has been like that the last two and a half years we've owned it, so dont think that will be part of the same fault though...
Any help very much appreciated....
