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Posted on Jan 02, 2017
SOURCE: my mx3
Sounds like the excuse is a load of BS to me. If that was the case, the oil would of been burnt off during the normal test drive after they completed the head. I'm assuming you had a blown head gasket?
Blue smoke is indeed oil and if it ONLY occurs at start up then clears itself after some driving, it's the valve stem seals or valve guides (but more likely the stem seals).
They were most likely not replaced during the overhaul.
The stem seals stop oil from the upper lubrication in the head travelling down the valves into the combustion chamber and burning with the fuel.
While the engine is running, there is enough movement in the valvetrain (all the bits that move the valves) so that oil cant make it down into the combustion chamber.
However, when the engine is stopped and left for a period (ie: overnight) oil can trickle down into the combustion chamber through the seals which is why when you first start it up the next day it blows blue smoke. All that gathered oil in the combustion chamber is burning off.
The reason why they probably haven't changed the seals is simple: they make more money.
As a mechanic doing a head you have 2 options: You can either get what's called a 'Headset' which is the head gasket with all the other gaskets involved and stem seals OR you can buy the head gasket by itself and reuse the old gaskets and not replace the stem seals.
The head gasket by itself is half the price of the Headset but you can still charge the customer for the full headset....see where im going? Trust me, this kind of practise is unfortunately very common and one of the reasons I got out of the industry.
Once a car overheats due to a head gasket or any other problem, the stem seals nornally always have to be replaced because they harden due to the heat and lose their sealing power.
The solution? The head has to come off again to replace the seals and these guys probably know it so they are going into BS mode to protect themselves.
You have to insist they fix the problem because it wont go away and don't back down!
Oh, and for future reference there are only 3 kinds of smoke you can get:
Blue = Oil burning
White = Water burning (pretty normal in the morning)
Black = Fuel burning (Mixture running too rich)
Hope this helps :)
Posted on Aug 03, 2008
ok, its time for a radiator flush. there is major sludge in the internals of this radiator. Make sure the thermostat is in the correct position as well. I've seen many cars come into my shop with the thermostat inserted backwards.
Posted on Mar 13, 2009
The problem is the torque converter solenoid. I had it happen on my 94 Cavalier a few years back and was a cheap fix at the local car mechanic. What happens is the transmission warms up and hits a certain speed where the solenoid engages, but then it sticks and won't disengage until it cools down sufficiently. When it sticks, it causes the car to shake when slowing down and will snub out the engine if you come to a stop.
Posted on Mar 25, 2009
first try so SPT gas teatment may sure you have a half tank of gas and then put in a little more of gas if this help change the fuel filter also check the vaccum lines and make sure they are all on and in and good conditon and also checkout the intake manifold for leaks
Posted on Apr 13, 2009
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