10 replies to this topic

[hoosier68]

hi:

I noticed oil spits from my exhaust, 1970, 998 automatic. replaced the plugs and they were clean. any ideas on what may be wrong and how much its going to cost me?

cheers

Patrick in Cambs

[stickycreambun]

You definately sure its oil? Sometimes if its running too rich it poos out nasty black carbon stuff that could look like oil, I know because my housemate went mad when I started up on full choke and covered her numberplate..

[T.Harper]

Also, if you do a short journey, water condenses in your exhaust and then spits out sooty water on start up. Can be that

[hoosier68]

You definately sure its oil? Sometimes if its running too rich it poos out nasty black carbon stuff that could look like oil, I know because my housemate went mad when I started up on full choke and covered her numberplate..

It is black and sooty, maybe it is. i do hope so. come to think of it, it looks more like soot than oil. i normally notice it when its cold and choke on.

[hoosier68]

You definately sure its oil? Sometimes if its running too rich it poos out nasty black carbon stuff that could look like oil, I know because my housemate went mad when I started up on full choke and covered her numberplate..

thanks for the illustration, that does look like it.

[Retro_10s]

Shouldn't be excessively sooty though,... i'd forgive a little smoke on first startup with choke out on full, but after that it shouldn't smoke at all.

Is it definatley soot?... or is it oily too?>.. mine used to do this and it turned out the Piston rings were dead.

[hoosier68]

You definately sure its oil? Sometimes if its running too rich it poos out nasty black carbon stuff that could look like oil, I know because my housemate went mad when I started up on full choke and covered her numberplate..

thanks for the illustration, that does look like it.

I put a newspaper on the ground after intial start up and reved the engine. It was black runny sooty type, and it dried pretty quick. I am hoping if it were oil, it would have been a bit greasier. I havent tried it after running it for a bit, just noticed it yesterday and its raining today. dont want to get it wet.

[Retro_10s]

Sounds like maybe you need to De-coke (scrape all the carbon deposits left from combustion off valve faces and surrounding metal) the head (or/and wang some valve/carb cleaner through with your next tank of fuel) and do some long journeys now and then to clear the engine through.

[hoosier68]

Sounds like maybe you need to De-coke (scrape all the carbon deposits left from combustion off valve faces and surrounding metal) the head (or/and wang some valve/carb cleaner through with your next tank of fuel) and do some long journeys now and then to clear the engine through.

sounds good, i will try that. Thanks

[Retro_10s]

Also try running a good tankful of 'Vpower' or similar fuel like BP Ultimate through it,... It contains Detergents etc that will clean your carb/injection system etc through as you drive

Fill it up and then give it a good wang down the motorway for a couple of junctions

[hoosier68]

Sounds like maybe you need to De-coke (scrape all the carbon deposits left from combustion off valve faces and surrounding metal) the head (or/and wang some valve/carb cleaner through with your next tank of fuel) and do some long journeys now and then to clear the engine through.

sounds good, i will try that. Thanks

Cheers, will it also make my 998 go faster?