I have an 89 240sx with a stock sohc KA. I don’t drive the car much since it is in does need a lot of work and will be in storage for the winter.
What i’m wondering is i know that white smoke can easily be the head gasket starting to go. But my car does have some other issues with the exhaust system. I’m sure my cat is not working properly i don’t know if that could have anything to do with the smoke or not.
Any help would be appreciated i don’t want to destory my motor if it is the head gasket. Thanks
i forgot to mention i cheaked the oil no bubbles, looked good was at a high level as well…
also cheaked coolant it was at the right level and there was no slug under the radiator cap which i have heard is a strong sign ur head gasket is gone.
Also the car didn’t produce the smoke before, it has always smelled (always figuered it was the cat not working properly), but the white smoke just showed up stronger when i ran the car today.
I just got a friend to come and rev the engine for me as i looked around the car. at first the car didn’t smoke at all the exhaust smelled fine and was clear.
After having my friend rev the engine a bit the white smoke started, more smoke with the higher revs. The exhaust and general car just start to stink of gas right away.
I’m guessing this is because the car is running rich?
the only change i have made to the car is the spark plugs and that was for newer NKG plugs.
Revving a car and smelling the exhaust is gonna give off a fuel smell…you might want to get a video so we can take a look and give you an idea as to what is and isn’t expected given the weather etc…
Loosing coolant at all? How does the condition of the coolant look, is there notable crap in it? Mileage on car? Recently have a carbon clean or intake cleanup or anything like that?
Yea i had cheaked coolant and oil before i don’t believe its my head gasket.
Also the smell of gas is very strong, not just the general smell of fuel it strong smells like unburned gas. Standing on my driveway u know right away its not normal and should not smell that strong.
I do have an idea of what it might be though. I took this part off my intake manafold yesterday and noticed that the hose to the bottom spout was cracked and the spout was clouged.
In the pic i’m holding the part upside down to the way u would see it on the car. Its behind the throttle cables and bolted to the intake were my hand is holding.
Is this part the Idle Stabilizer valvue? If it is i believe this could be my problem. Specaily since the car idle’s fine before i touch the gas.
Once again i’m not possitive what that part is and i did try searchin the part # with no luck.
Also what is a site that i can host a video on? took a video of what i’m talking about but don’t know how to post it.
But if the fuel smell is really strong, you’ll probably want to figure that out first. See where it’s coming from. Check the injectors O-rings and then work your way around the system, checking the fuel filter & fuel pump along with their connections/lines and that kind of stuff.
looks to me like the egr control backpressure transducer valve (egrc-bpt valve). the bottom hose is where exhaust gas pressure is present, so if that hose was cracked, then you would have an exhaust leak, explaining why you smelled unburned gas. also, since the actual inlet to the valve is clogged, your egr likely does not work. as for the white smoke, i believe it’s been explained thoroughly in this thread.
