strange metallic chi chi chi chi rattle on acceleration

[rossbarry1]

8 valves cant be timed..........

[sharki786]

i have the same prob. its leaking from the gaskets on the mani-cat. mine was the 1st & 4th on the outlet. its a b!tch of a job on the agg engines, had to take both engine mounts off and pull engine forward and then took the inlet off & the manifold off the downpipe to the cat. i used a high temp silicone sealent on the gaskets after but broke a bolt on the manifold to the downpipe so back to square 1. just take your time mate if you know what your doing. otherwise expect bills from £80 onwards. its not the timming or anything. defo the manifold to the cat leaking. replace with new gaskets cost pence but please use that silicone sealent as if you use the exhaust paste it tends to get brittle after a while and breask off you will be forking out the same amount again to rectify the prob.

[marky-gee]

So is it where the manifold meets the head? Or is it manifold to downpipes? Or down pipes to cat?

[sharki786]

personally id put silicone all over the fecking exhaust. but put it on both sides of the manifold (head & downpipe meet) the downpipe and the cat side. you dont need to go futher than that unless you have a leak. i went to the local autospares around here but they dont do the silicone http://cgi.ebay.co.uk/HIGH-TEMP-Oven-Door-CLEAR-Silicone-ADHESIVE-GLUE-167-/160492587340?pt=UK_Home_Garden_Kitchen_Ovens_Hobs_Cookers&hash=item255e1a894c something like this would be good. 

[danny_p]

exhaust sealing paste is a better bet,  silicone selant won't stick exhaust temps

[sharki786]

i had this debate with someone else. exhaust paste gets brittle after a while. a guy who does custom stainless exhausts uses this ALL the time and he has never had any probs and he does 3-6 cars per day depedending on the type of job (torqueflow)

[marky-gee]

ok bit of an update

Noticed it doesn't do it on 1st gear ever if you drive it right up to 5000rpm, weird.

when i start the car im noticing the revs don't go over 1000rpm when cold and sometimes its struggling to stay idle ,should it not rev a bit higher on cold start

also noticed that there is a bit of popping coming from the exhaust when its blipped,could it be over fuelling? what would cause this ?

can i also state that this noise is 100% only under load not when revved parked up, and is definitely engine associated

[Wayne]

8 valves cant be timed..........

Yes thay can 

Sounds like it i pinking to me.

[marky-gee]

8 valves cant be timed..........

Yes thay can 

Sounds like it i pinking to me.

I do hope so.......i honestly do.

unbelievably though every garage i have been to tell me it cant and also 50% of the vw community tell me the same. who do i listen to ?

In layman's terms how would i go about checking? bearing in mind i don't have a timing light and the garages around here don't have a scooby

[danny_p]

from your sig i'm guessing its a 1997 mk3 2.0 8v

they pick up a  signal from a toothed wheel on the cranck that is non adjustable the dizzy is just used as a cam position sensor and adjustig it will throw it into lame mode.   so you cant adjust the timeing

but if you have a sensor fault the ecu will be getting the wrong infomation and applying to much spark advance.  knock sensors and airflow meter