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1979 Chevrolet Chevette Repair Question


Topics covered: Exhaust, Gas, Smoke.
Mileage: 28 miles.

Asked on November 26, 2011

Whiteish smoke coming from tail pipe!

Could this be a bad catalytic converter? anyway to test if it is without taking off the caty? we have a decrease in mpg thats all i have noticed. i know it could be blow by or a bad head gasket but i havnt had to fill the oil or the antifreeze.
Avatar Asked by 09emdog

Answer

Replied on November 26, 2011

I doubt that it will be a converter, but if you go get an exhaust gas analyzer test done this will show the emissions and give an indication as to the serviceability of the converter, also with the exhaust cold, just give the converter a thump with your fist, if it rattles at all, this will be an indication that the matrix has cracked.

Tiny Answered by mhpautos (expert)
27,079 answers provided
Replied on November 26, 2011

well if you dont think that its not a caty then what do you think it is? the antifreeze is a nice green and the oil is a good color.

Tiny Response from 09emdog
11 questions asked
Replied on November 26, 2011

where can i get this exhaust gas analyzer test? in wisconson they dont require any emission test.

Tiny Response from 09emdog
11 questions asked

Replied on November 26, 2011

white smoke is a sign of coolant burning, it may not be a lot and not very noticeable in the coolant, a head check will confirm this, this is a simple chemical test for Co in the cooling system, any work shop should be able to do this simple test, as for the exhaust test many work shops have 5 gas analyzers for general service work, ring around you should find one that can do this for you.

Tiny Answered by mhpautos (expert)
27,079 answers provided
Replied on November 29, 2011

Ok im planning on doing a compression test and was wondering what the compression should be. Also i dont mean a lil white smoke if it is white not a blue/white smoke (blow-by) i mean alot.

Tiny Response from 09emdog
11 questions asked