smoking

[yotaboy94]

my girlfriend has a 90 240 and the exhaust had fallen off so i took the stock exhaust off of my 93 {with a blown motor}. Now her car smokes like a freight train. Could it be from the oil inside the exhaust burning off. Please help.

[trpower7]

Could be so. What color is the smoke? How long does it do this? Does it do it all the time? More info is needed.

[yotaboy94]

white and it does do it about 2 min after it starts up.

[trpower7]

White smoke suggests coolant as far as I remember.

[yotaboy94]

i always thought white smoke was from oil

[DAEDALUS]

Bluish dark smoke is from oil. White, sweet-smelling smoke is from coolant. Dense, rich-smelling white smoke is from excess fuel (injector leak). Coolant in the exhaust is never good news...check your oil to see if it looks milky and if the level's high. Check the coolant for signs of oil. And pull your spark plugs to see if they look REALLY clean. All signs of a blown head gasket.

[90drifter]

Are you sure about all that My 90 240 is doing the same thing. Just rebuilt the motor, put back in the car and for a week now has not stopped smoking. It also kinda feels like it is bogging down.

[DAEDALUS]

http://www.tnrcc.state.tx.us/a...7.pdf (2nd-3rd pages)http://www.sexydog.freeserve.c....htmlhttp://www.2carpros.com/topics/ (look at various topics of "smoke")

There are a LOT of guides on the internet that give tips on buying a used car. Do a search and look them up. Most of them say to check the exhaust, and for the most part, agree on what varying gas colors mean. The dense white smoke = injector leak is often omitted, but I know that symptom from experience. Usually doesn't happen on its own...in my case, I pinched an injector seal after working on my car, so fuel was literally streaming into the cylinder....so much that it wasn't even firing.

You'll usually see white smoke (steam) on startup, but it should disappear or, at the very least, become far less obvious, within a few minutes.

[yotaboy94]

i do have a small injector leak but it doesn't stop smoking if you rev it up to about 4000 rpm it gets worse.

[Meantime]

Have someone else run the car, and while it's smoking, give it a sniff test. If has a sweet and citrus smell, and it's lingering white smoke, then it's definitely coolant being burned off, which is usually a dead canary for a bad head gasket.

If it smells "oily" and pungent, and the smoke is lingering bluish-white, then you've likely got a valve seal or other oil-related issue in the combustion chamber.

If it smells like "gas" and black soot comes pouring out of the pipe, it's running too rich and you've got a fuel/sensor/injector type issue.

Try not to breath too deeply, don't want you to suffocate now. Since it keeps happening even when the engine is revving higher, I'm kind of leaning towards a fuel issue, but more specific info might help.