watch the video and let me know what is causing this smoke i need to fix.. 1994 honda civic lx sedan currently using 10w30 oil no leaks at all so idk what could be the problem it runs good but just throws out alot of smoke

 

No imformation on your car like year, make model?
Black smoke ..... oil, lean condition.
A little more information gabe.

 

its a 94 honda civic lx sedan no leaks what so ever, im using 10w30 oil it comes out blakc smoke but than turns white like in the video

 

Is it burning a lot of oil? Compression/leakdown tests.

 

yeah i estimate about mmmm in like 2 maybe 3 weeks i have to put more oil like fill up the whole thing and i have no idea how to test it or where to go to test it. i know my car needs a new CAT could that be the reason y

 

You can rent the tools from an autoparts store. If you check the FAQs at the top of the page there are links to outline how to perform both tests. I'm thinking your rings are shot. Maybe go straight for the leakdown test.

 

The black smoke is fuel, the blue/grey smoke is oil, white normally means water getting in the cylinders. Maybe the white you see is just steam from starting your car up then reving it right after. Not really a good thing to do.

 

well i usually let it warm up than go slowly but it still comes out like lil by lil

 

hit the faq like Marc said & start testing.

 

i could be bad injector or a bad o2 sensor that isnt quite bad enough to show a code yet

 

+1 on bad rings. Probably gummed up oil control rings stuck on the lands, no longer contacting the cylinder walls.

I had a y8 that was burning a quart every 500 miles, but had perfect compression numbers. Never got around doing a leakdown since I was going to junk it anyway. I've got some horrifying photos of what I found inside if you're interested.

 

head gasket ... or you're putting too much oil in ... btw i'd use a higher weight depending on miles ... 125k +

 

so i have to open the head and check it

 

That's a stupid way to mask the problem. Higher weight isn't going to fix a damn thing.

No, you need to read the FAQs for how to do a compression test, and a leakdown test. No head removal required.