My 1990 mazda 626 has white smoke comming out of tail pipe

Charles, after searching the net., stuck injectors,faulty fuel pressure regulator or faulty ECU. Have a good Tech, check engine codes, diagnose and estimate repair. Check the attached links,instruction and guides, Good luck
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White smoke out of exhaust not what you think Club Lexus Forums
Es300 Smoking Bad And Gas Smell Help
http://www.automotiveforums.com/t967184-_93_lexus_es300_fuel_in_exhaust_runs_rough.html

Where is the white smoke coming from? Under hood? Out tail pipe? If excessive white smoke from tail pipe, suspect a head gasket failure which in turn will fill the cooling system with exhaust pressure forcing the coolant to come out of the reservoir and resulting in an overheating problem

its a GEO POPPER.
"no oil up on crank case"

no idea what that means.??????
yes PCV valve. do clog.

white smoke at end if tail pipe.
you didnt say where,?

white smoke has 2 reasons.(tail end)
Steam and oil.
steam goes away fast and looks just like moms tea pot. and smells sweet, like the antifreeze in engine. (rad cap off ,sniff sniff, cold engine)

oil burning, smoke is very very slow to go away.
and smells like , blush burned oil.
if not sure what burn oil looks like or smells like
take out the dip stick on a hot engine
let it drip to the hot exhaust manifold there.
now you know. and is a key diagnostic skill.


no oil seen on dip stick end?, you mean that?
well you need to keep that from happening,
doing weekly service, and for sure old cars.
26 years old.

low oil invites blowing up a good engine.
for sure.
if it did that smoke is oil
if it did 10x worse, both .

my wild guess is you meant to say
I didnt see oil leaking on top of engine.
right?

if the engine backwires to the air cleaner
you forgot to replace the cam belt every 60k miles
the pcv will also be clogged, on cars not getting proper service, super colon.
if the PCV clogs,engine may leak oil bad.

this engine btw is a G10 3 cylinder.
with TBI injection.
we can talk TBI all day, owned one.

white smoke can come from many places
exhaust manifold, leaks of oil can land there
engine can back fire to air cleaner making smoke.
tail end.
steam is much worse. ill not delve in to that yet/.

Sounds like a blown head gasket to me.

Your exhaust valves have deposits on them that don't allow for a good seal when the engine is cold, or your piston rings are worn, allowing oil to get past when the engine is cold. In either case the seals improve as the engine warms, making the smoke go away. You can try to see if an oil additive will improve your situation.

sound like you have a bad head gasket.

U have a leaking engine cylinder head gasket, don't keep driving this you will do more serious damage than u already have.

Hi
Lots of things to check
?Leaking head gasket
Does it use brake fluid
Start engine only fo a few seconds, shut down, remove all spark plugs to see which ones are fouled

cylinder head valve seals needs to change.