Cracked Ex Manifold

[Craved]

hey people, found that my exhaust manifold was cracked really bad (read: almost right around) when i was changing the head gasket trying to resolve an overheating/bubbles in the radiator issue...

can anyone confirm whether or not this would cause an idle problem?

symtoms include : cold starts very bad, wont idle at all and stalls when no throtle used... plus when the throttle is applied will suddenly jump up over 2K then when released will drop to 1K then bounce up to 2K again then drop and stall...plus on/off throttle when driving is really sudden and un-smooth/jerky (similar to if the tps is set wrong)

have been told that it shouldn't cause this but i believe otherwise since the issue gets better when the cars warms up... then gets better, to almost idle after its warm and i rev the car out a couple of times...

my guess is that when the car warms up more the manifold expands and closes the gap heaps..

any ideas? it will be getting replaced eventually when i get the new turbo on but it's bugging me now and for the last couple of months

[Sumo]

Idle problenm sounds more like a airleak into the intake plenum (Uneducated guess)

[Craved]

yeah i checked that out Sumo, even replaced all the gaskets in the head with the headgasket! and it has me a bit stumped seeing the idle settles down more when it's warmed up and reved out (read more heat in exhaust)...

wil have to wait til i get a new ex manifold to really see!

[bbenny]

problems sound similar to a dodgey aftermarket BOV

i know on my car with an aftermarket BOV if i rev the engine and let the revs drop free the engine will stall 9 out of 10 times.

otherwise it defenantly sounds like some sort of inlet air leak

[Craved]

yeah i checked that, even with standard BOV it does it...

will keep checking,

rephrase the question --------------------

what would a leaking exhaust manifold do on a turbo car?????