1994 Mitsubishi Magna head replaced still whie smoke

1994 MITSUBISHI MAGNA
300,000 MILES • 4 CYL • FWD • MANUAL
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KEDGENZ
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hi guys have a magna 94 with 2.6l engine

the cars was smoking orginaly when you first started the car. give it a rev goes away then comes back

so i pulled off the head and seen the head was worn and corroded but head gasket looked ok no signs or traces or leaks.

i got another head from another magna that had done 160km didn't get it plained as i cheak it tolarance and was ok reseated the valves and installed new valve seals put engine backtogeather with new head gasket and is running

now when i first start the car no signs of smoke or anything even if i rev it but after 5 to 10min of idaling then i get white smoke coming from the exsaust

im stumped on what it can be maybe a sensor or somthing. if it was a gasket or crack it would start smoking straight away?

other thing is themostate is stuck open will this cause it.

any suggestions be great
Oct 8, 2010 at 5:52 PM
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MHPAUTOS
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Hi there,

The thermostat will not be at fault but it should be replaced anyway, i would start with a head check, this is cheap and quick chemical test to check for signs of Co in the cooling system, if so this is a sure sine of a continuing head problem, start here.
mark (mhpautos)
Oct 8, 2010 at 5:56 PM