Question about 1998 Toyota Sienna
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Posted on Jan 02, 2017
Welcome to FIXYA
There in only 1 thing i can think of where the white smoke is from it could be anitfreeze if so it would mean a cracked head or a bad head gasket if it gets worse then you have a big problem but if you check the water level and it looks fine then you should be ok for a while
if it was black smoke or a real dark gray then it would be oil
i hope this helps you out have a good day
Posted on Jul 16, 2008
THE REAR AND FRONT AC ARE ONE IN THE SAME, JUST ONE COMPRESSOR, IF THE FRONT WORKS THEN THE SYSTEM IS NOT LOW ON CHARGE, U MAY HAVE A CONTROL PROBLEM.
Posted on Jun 24, 2009
It is running rich, too much gas possibly plugged air filter or PCV issue. May just need a tune-up. Blue smoke would be oil burning and White could mean headgasket or worse....
Posted on Dec 07, 2009
The likely cause is coolant leaking into the cylinders due to a failed head gasket. You should be losing some coolant and need to top it up so check the level. You will also find that coolant is finding its way into the lubrication system and "contaminating" the oil.
Remove the dip stick to check the oil and if you can see a whitish substance in the oil you have coolant in the lubrication system which is is leaking through the failed head gasket.
You may also see traces of oil in the vehicles cooling system so look there also.
The only fix for this problem, once properly diagnosed, is to have the head removed from the engine and a new head gasket fitted. The head would also need to be checked carefully in case of cracking and in any event would most likely need to be machined by a head specialist before being refitted.
The `cause of the failure is unknown but if the vehicle has ever been operated with an overheated engine (due to problems with the cooling system) this is enough to blow the head gasket and to potentially damage the head on the engine.
Not good news I'm afraid so please get it checked out and properly diagnosed with a reputable auto repair business.
Posted on Dec 15, 2009
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