Question about 2000 Mazda Protege

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Car problem My car has a lot of white exhaust coming out and it rumbles when you start it ans then shuts off

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Sounds like you have a head gasket or cracked head problem, pull the spark plugs get a cooling system pressure tester and pump it up to about 25 psi. make sure the cooling system is full and there are no leaks. if the pressure drops pump it back up leave it there for a couple of hours and keep looking into the spark plug holes for any antifreeae leaking into the cylinders. This may take a hour or so so be patient and watch it you will find antifreeze leaking into the engine thats your white smoke. You didn't mention if it overheats or if you are using coolant please get back to me on that.
Please if you like my answer give me a good rating thank you.

Posted on Aug 07, 2008

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Posted on Jan 02, 2017

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1 Answer

What causes white smoke or steam to come out of the exhaust?


white smoke is an indication of coolant in the combustion chamber. I would suggest having a compression test done as there may be a gasket problem or cracked head.

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White smoke is an indication of water in the engine. Like when you see a car with white smoke from the exhaust on a cold morning, it's heat moisture condensate in the exhaust (normal), and is being heated and converted to steam as the engine blows hot exhaust out. To test if it's water in the engine, there are two likely indications, (1) the motor oil will be milky and white, or (2) you can remove the spark plug and see if any cylinder sprays water mist when the engine is turned over. In either case the problem is a bad gasket, maybe head gasket (repairable), or a cracked block (big $$$ fix). If engine will not turn over, there could be two causes (assuming the battery and starting system is good); (1) a cylinder is full of water and hydraulically locked keeping the engine from turning over (removing spark plugs should relieve the pressure and allow you to turn the engine over (* you'll see mist or water coming out spark plug holes), or (2) the engine is seized, therefore the previous troubleshooting is unnecessary, engine replacement is necessary. Best of luck resolving this problem.

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This seems to be a symptom of a blown head gasket.
White exhaust smoke is an indication of water / coolant in the exhaust. The car running sluggish and using lots of fuel can be caused by compression loss.

Look at the coolant level color and smell (with cold engine - don't open the high pressure reservoir with engine hot as hot coolant may spray you in the face). If you have a blown gasket, the coolant color may become brownish and it may smell bad or the level will get lower even if you have just refilled the cooling system.

What you can also check for is bubbles in the reservoir. With engine cold, remove the reservoir cap. Start the engine. Try to rev the engine (or have someone do it) and observe if there are bubbles in the reservoir tank. If you see lots of bubbles, you have a blown gasket.

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1 Answer

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The white smoke you are seeing is steam. From your description, sounds like you have coolent seeping into the combustion chamber, mixing with your fuel/air, and exiting out through your exhaust as steam. 1, blown head gasket. 2. cracked head or block, 3, warped head due to overheating. Most common is #1.

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That is normal, condensation. Check your coolant level and make sure smoke doesnt smell like coolant. If it is coolant then it is a blown headgasket. Have a repair shop do a quick test.

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1 Answer

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Does it use any oil, or lose any coolant? If not, do you make a lot of short trips, then shut it off by chance? If your not using oil, or coolant, then I'd say take it on a long drive at highway speeds to drive out the moisture laying in your exhaust system. Recently had a muffler go on wife's car that does a lot of short trips, and old muffler was almost full of water from condensation and obviously poor exhaust design, that allowed it to build up like that. Took it next night on trip about an hour away. Every time I took off, or passed a car, white smoke rolled out the back. On way home, it stopped and cleared up.

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1 Answer

White smoke coming out of the exhaust when starting?


Hello;
Volumes of white smoke is an indication of water in the exhaust. A certain amount of vapor will be present on start up, but if it is different than what has been the norm for this vehicle then a check of the cooling system is in order.
Rich
RPM Northwest

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