Question about 1998 Mitsubishi Galant

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White smoke from the exhaust but did a compression test 190 psi all cyliders exhaust smells like gas and brand new plugs were all carboned up

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This is a problem with rich mixture. The golden air:gas mixture ratio is 14.6. When a ratio is less then this then you have a rich mixture ( less air, more gas). All Carbon built up at new spark plugs since there was too much gas not burnt out completely. Check out air filter and Mass Air Flow sensor. Good luck.

Posted on Sep 13, 2010

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White smoke is usually an indication that there is coolant in the exhaust. You may need to have a block test and test for a bad head gasket.

Posted on Sep 13, 2010

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White exhaust smoke (which has a sweet smell) is often an indication of a blown head gasket. You'll need a compression test or test the antifreeze against exhaust gas contamination. Although the compression test will tell you more about the contition of the head gasket.
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Its possible that your crankcase is full of gass too, I suggest change oil and filter, also, if it wont go over 40, the converter (catalytic) is probably damaged as well, raw fuel in the exhaust will break up the cat. Oil change is imperitive as too much liquid in the crankcase will destroy an engine in seconds. Can also be caused by the clogged converter, too much backpressure.

Get a vacuum gauge, hook into a manifold vacuum source. Increase RPM to 1500-200 and hold steady, if vacuum gauge falls, exhaust sytem has a restriction, the cat or muffler or a pipe has a broken chunk of the cat blocking it.

Hope helps; keep us updated.

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