car is hard to start and keep running. does not want to idle and blows whit smoke. after revving it up a couple of times clears up. turn car off and there is still some white smoke coming out. runs great after start up. i think its the I.A.C. but smoke has me wondering. any idea guys?
white smoke
- Thread starter 7Mownsu
- Start date
White smoke can indicate a blown head gasket. Do a compression test and report back. Do you see a brown/white looking substance under the oil cap or in the oil.
^ x2 compression test. White smoke could be a sign of coolant entering combustion chamber and burning off which only means blown head gasket! 
the compression test will usually tell you whether you have that sort of bhg or not.
(oil and coolant don't always mix with a bhg)
the compression test will usually tell you whether you have that sort of bhg or not. (oil and coolant don't always mix with a bhg)
A compression test doesn't always show you what's wrong. Do a leak down test and se where its leaking compression into, IE the cooling system, or possibly even another cyl.
Also, you will likely have brown/milky stuff under the oil cap just from condensation in the air. Better way of confirming coolant/water in the oil is to crack the oil drain plug and drain a bit in to a clear container so you can see what's coming out. Water and coolant will sink to the bottom of the pan and come out first.
i believe it could also be your valve steam seals
---------- Post added at 09:09 AM ---------- Previous post was at 09:08 AM ----------
how much white smoke? little bit or are we talking fog machine?
---------- Post added at 09:09 AM ---------- Previous post was at 09:08 AM ----------
how much white smoke? little bit or are we talking fog machine?
looked under cap has some condensation. its quite allot of smoke. will do compression test asap. wouldn't it smoke all the time or only on start up. just got the car 2 weeks ago looked like the head my have been of recently. has new manifold gasket and found valve cover gasket pieces in car. car had sit for 6 month before i bought it, was a repo. so guy i bought from has now idea. what kind of compression should i be looking for? thanx for the help. 87 turbo
Compression check instructions
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=20
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?Section=EM&P=20
thanx for the info. if the head gasket is blown i will more than likely pull the motor and rebuild it. need to get trans fixed any way. i will try to shot for the 3-400 horse range.