91 Blazer Blows Smoke

[91s10blazen]

Looking for a little advice, I've got a 91 s10 blazer with a 4.3l tbi v6 that blows a lot of white smoke after a few minutes of driving. It's got to be burning oil because I'm running low. It started doing this after I accidentally put a half a quart too much oil in on my last oil change. I did a compression check and all 5 (couldn't do the #3 cyl. because steering wheel shaft) cylinders showed 180psi.. Could it be the valve seals or guides? Any ideas would be appreciated.

[SwiftyR]

get a new motor

[91s10blazen]

Thanks:sarcasm1:

[natedoggie]

white smoke usually means you are burning water, maybe headgasket or cracked block? oil is a blueish color when it burns...usually.

[MagicRat]

Originally Posted by natedoggie

white smoke usually means you are burning water, maybe headgasket or cracked block? oil is a blueish color when it burns...usually.

I would agree. After a few minutes driving the cooling system has pressurized, forcing coolant into the cylinders. My first guess is a blown intake manifold gasket, or possibly a cracked intake manifold.

The cooling system can be pressure tested. If it will not hold pressure for long and there is no external leak, you have an internal coolant leak.

[MT-2500]

Originally Posted by 91s10blazen

Looking for a little advice, I've got a 91 s10 blazer with a 4.3l tbi v6 that blows a lot of white smoke after a few minutes of driving. It's got to be burning oil because I'm running low. It started doing this after I accidentally put a half a quart too much oil in on my last oil change. I did a compression check and all 5 (couldn't do the #3 cyl. because steering wheel shaft) cylinders showed 180psi.. Could it be the valve seals or guides? Any ideas would be appreciated.

1/2 qt to much should not hurt it.
White smoke can be caused from buring coolant.
Are you loosing coolant?
Is oil deluted or smell like gas or look like coolant in it?
Any oil leaks?
Try another oil change.

[Torch]

Here is a general guide on smoke:

Blue = Burning oil (numerous causes), can usually be smelled long before it becomes visible.

Black = Engine running too rich on fuel (excessive fuel pressure or systems/sensor failure), can sometimes be smelled if it is bad enough.

White = Coolant is entering the combustion chamber (usually bad head gasket, intake gasket, or cracked block or heads), can often be smelled inside the car.

Gray = Usually occurs when coming to sudden stops, and usually caused by oil being sucked down worn exhaust valve guides, not always noticeable unless the wind is blowing towards the front of the car or someone else tells you, can sometimes be smelled if it is bad enough.

As was already said 1/2 quart extra should not have hurt anything.

As far as blowing white smoke goes, pull all of your plugs and do a compression test it should tell you were the leak is occurring.