So my 90 dx shoots out alot of smoke , could it be o2 sensor ? or headgasket? coolant is being burnt went through the whole resevoir in abou 70 km...

 

take off your oil cap. If it looks like a chocolate milkshake exploded, then your head gasket is bad. Sometimes the failure is more subtle, so you wont see the milkshake effect, but if you have gone through a whole reservoir, then it probably isn't subtle.

 

I dont see a chocolate milkshake effect , someone said if you open the radiator and it bubbles it means its blown , so I did that and it shot everywhere.

Anyways alott of white smoke comes out of my tailpipe how can I be positive its head gasket , the coolant is disapearing maybe its burning somewhere else?

 

could it possibly be running rich and burning fuel?? causing the white sweet smoke/

 

it should be the o2 sensor or ur rings r fried. if its smokin from low rpm thats ur rings, if its from high rpm its ur valve seals. good luck on ur problem

 

Yea bro your headgasket is shot.

 

If you're smelling a sweet smell and its smoking a lot then that's the coolant burning off. Coolant has a sweet smell. Its got to be your headgasket. Also never open a radiator cap when your radiator is hot