Coolant coming out exhaust, engine light on

he causes of white exhaust smoke can vary; however, it is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke.
One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located.

Take it back. I doubt the short block is bad, but if the smoke persists beyond a day or two, the cylinder head may need removing to check the fit of the head gasket, and to ensure the passages in the head match the block. Does the exhaust have a sweet smell? That could be coolant burning.

Now it is possible that a little spilled coolant may have collected in the exhaust during the engine swap, and that is why you see white smoke. This should burn off in a day or two. If the smoke persists, and the coolant level is dropping, they need to take it back and fix it, at their expense, at least the labor charge. Toyota may have made production changes during the year on this engine, and that is what needs to be investigated. That, and if the head gasket is correctly fitted.

defective catalytic convertor. It may be plugged up.Make sure ALL the exhaust line from intake manifold(at engine block) to final exhaust pipe are not clogged up.You have reverse exhaust pressure going back towards engine manifold.

1. Check the hoses and clamps going from the reservoir to the radiator and from the radiator to the engine. Make sure they are flexible and in good condition.
2. Check the reservoir and radiator for leaks.
3. Replace any parts they may be failing. If no leaks are found proceed to next step.
4. Check engine oil. If oil has coolant in it you may have a blown head gasket or crack in the head or engine block. Another sign of a coolant leak into the cylinders is white smoke coming from the exhaust after the engine is warmed up.

Mazda rx 8 creates a lot of heat, to fix this you must change out the coolant every 20k miles, with the mazda brand coolant i think its called mazda f22 coolant, the engine stays hot due to the high RPM engine, you may want to check: ignition coils, cat, coolant, and do a compression test.

Generally, white smoke is engine coolant burning. If it only happened for a few seconds, you may have leaked some on the exhaust pipes.
I would check the engine oil and coolant levels with the engine cold, and then look for coolant leaks.

You'll need a cooling system pressure tester to put pressure in the system and it will force the coolant out of the area where it's leaking. Water pumps are common as are heater hoses. Sometimes it's really hard to find the leaks. If you've overheated too many times, you may have warped the cylinder head and that will cause a major leak. Look for white residue around the head/block and should point you in a genreal direction.

Typical symptoms of a blown headgasket may include: -bubbles of air coming up into your radiator (remove cap before starting) -leaking radiator -milkshake colored oil -overheating -rough running -coolant or oil running from head -spark plug(s) that have a green tint (if green coolant). -white colored or sweet smelling exhaust, white smoke of your tail pipe, or loosing coolant through your overflow

the ac is a gas leakage problem and can be fixed by an accredited ac specialist shop
the exhaust gas smell could be the flex pipe at the exhaust manifold or a exhaust pipe gasket that has failed ( come loose after the engine replacement)
as for the engine lights , it con=mes on from reports from the engine and the transmission so have the fault codes read to find which sensor is reporting a fault
could be that same sensor that reports on the exhaust problem
hard to start is an electronic reporting fault and that will be in the codes as well

service your vehicle soon as a precautionary measure. No warning lights, oil level and engine coolant temp ok then I wouldn't worry but follow the recommended service intervals in your owners manual