I've got a little problem with my s2 engine.

When i rev it very high for a time during driving and get my foot of the accelerator paddle.
The engine goes down to about 500 rpm and some times even stalls.
When i drive it a little slower after this occures the enige runs about 900 rpm as it should be.

What could be the problem???

Thanx

 

do u take it out of gear???
if not ur car would stop dead lol
sounds to me you may have an air leak in the system sumwhere?
are u lossing boost?
check all pipes for cracks

 

Hej Stevo.

Yes mostly when i take it out of gear bur sometimes when it's stil in it and yes then it stops

I'm not losing boost ,but will check al the pipes

Thanx

 

Got a dump valve on it?

 

Yeps , it's a nomad double piston valve.

But as far as i can remember it also did it before i got the dumpvalve.

And when it runs some time after this occures there's no problem at al and it's doing 900 rpm nicely

 

ok mate, defo check for air leaks, let car idea and listen for whistle blowing noise.
as exter said it maybe dump valve leaking. take it off and block the pipe off.

 

ldle speed control valve mate, give it a clean out with sum thinners its bolted to the inlet manifold on the left hand side.

 

Ok thanx will have a look at that too

 

I had a simlar problem on my rst. It turned out i had blew the pipe off the top of the plenum chamber that goes to the oil breather. Try checking for a split hose.

As already mentiond it could also be the dump valve. Problems like this are normaly always down to air leaks, split hoses etc, so check them all carfully.