If it is the PCU it is best to get a refurb from Miami for 200 that they reprogram off of your vin.
The cylinder head gasket is failing- antifreeze is being sucked into combustion chamber and burning-thus the white smoke- sorry- you need to have heads planned and new head gaskets installed- cheers Denny
SOURCE: Lexus ES300 White smoke out the exhaust no milky substance in oil
It could be the intake gaskets or even still the head gasket. How about the coolant ? Did you refill with same type coolant ? Have you noticed if it's thick and gooey ? mixing coolants will sometimes produce a thick gooey coolant that clogs up the cooling system. If the car ran hot it could also be a cracked head or block. Warped heads also. Somehow the coolant seems to be getting into the cylinder(s).
SOURCE: '92 Lexus Es 300 - White smoke from exhaust and smells like gas.
It's the ECU. Very common with the early '90s lexus cars. Everyone will say head gasket, but unless your oil is milky white, it's not coolant leaking into the cylinder.
Buy an ECu on ebay for less than $100, it plugs in under the dash, just like a computer printer. Easy fix.
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