although this is probably not uncommon, it has only just started happening... anyone know whats going on / how to fix it?

perhaps a stuffed cat converter.

hey dude.. give ur coolent temp sensor a quick wiggle and maybe a bit of a clean.. its the yellow one just near where ur top radiator hose geos to the motor.. if that doesnt solve the problem.. run a self diag on the ecu. cheers Ollie

my car did that when it was running rich duno if that could be your problem.

k, i cleaned that coolant temp sensor, but problem still remains... its spitting a black watery subsatnce when i start it up, and after a drive, theres black **** all over the back of my car Some original photos have not been recovered yet.

the cars running rich and some of it gets left in the exhaust. then when you leave ur car overnight some air condenses to water (a little bit) and turns to black water **** which is very difficult to get off concrete (found out the hard way). a) check ur mixtures b) check the fuel pressure regulator is not buggered (mine was).

ok, how exactly do i check my mixtures? also, how much does a new pressure regulator cost?

take it to the workshop and they should have the right equipment to do it. couple of hundred i think