hello im new to this site but have only recently been going to the pf meets at the bull at arborfield. i own a g plate sierra cosworth and recently done an engine re-build but recently noticed that the car smokes on idle. the other problem is that it isnt all the time.only after a driving a bit hard. it doesnt seem to smoke when driving tho any help would be much appreciated!

 

what colour is it & how much comes out?

 

its oily smoke. i wasnt sure if it was the turbo. i dont want to buy one if that aint the problem.

 

Take off the intake hose and ehxaust and check for oil in those places. Also check how is your breather system. Is it connected to the intake? If not those two you probably have to go to somebody who build it and kill him

 

what azrael is saying makes senese because if the air in take is not connected properly then ur car will be starved of fresh air and will eventualy make it smoke its balls off. hope u get it sorted

 

When mine did that I had overfilled the oil

 

dose it do it on acceleration?
its a poss u have the rings upside down or an oil ring has broken

 

for arguments sake, say you'd removed the top ring of 1 piston to check the clearance in the bore, and you'd put it back on upside down, would that cause a lot of smoke when revving up after being on idle?

mine does that, but does not smoke on boost or on the overrun or anything. if that is the case, would you expect it to get better as you put more miles on the engine and wear the ring in?

 

unfortunately if its smoking and you have put a ring in the wrong way its not going to get better as its trying to scrape the oil up the bore instead of down it

 

can you get such bad smoke from just one top ring the wrong way up though?

won't the ring wear in at all? or are they so much harder than the bore?

 

what spec is the engine???? if its rings they will smoke when you accelerate hard, not just on idle, it might just be running a bit rich on the top end and after you have poodled it home after a good hard blast she may just be a bit sooty and thats what your seeing
find out if its definatly oil first.......whip the plugs out if they are black and oily..its fooked, if they are black and sooty, get a tuner to check the fuelling for you