I just change the exhaust manifold, but there are smoke coming from the whole new part, not from the holes, the heat shield has a little bit of oil o lubricant, could it be that the reason? or is it because it is a new part?
It is the oils burning off the new part which is coated to prevent rust while on the shelf, it will burn off and turn the same color as the other one is.... nothing to worry about.
SOURCE: 1993 TOYOTA TERCEL 1500cc Valve Seals Replaced now smokes much worse
You either have had the wrong valve seals installed, they are physically missing, or the valves are incorrect (too loose in the guides/stem too thin). The rocker arm seals will not contribute to your issue. If it did not have the oil smoke before you took the head off, the issue is with whatever the machine shop did. Valve seals have to fit TIGHT, or oil will go down the valve stem into the intake.
Take the head back to the machine shop & tell them to fix it. For free.
SOURCE: Lexus ES300 White smoke out the exhaust no milky substance in oil
It could be the intake gaskets or even still the head gasket. How about the coolant ? Did you refill with same type coolant ? Have you noticed if it's thick and gooey ? mixing coolants will sometimes produce a thick gooey coolant that clogs up the cooling system. If the car ran hot it could also be a cracked head or block. Warped heads also. Somehow the coolant seems to be getting into the cylinder(s).
SOURCE: coolant leak
More than likely it is coming from the intake manifold. You can use a pressure tester that hooks to the radiator and use a flashlight and mirror to get a better look at where it is coming from.
SOURCE: Accelarating from 25 to 40 MPH - a "rattle" in exhaust system
Had my y-pipe replaced (bad cats) and the bolts at the y-pipe flange where it attaches to the exhaust manifolds started to get loose and I go tthe viberating (tinning) noise. Took it in the first time and they tightened everything up but it seems it's doing it again so I'm going to try to fix on my own. Just wondering how much of a pain it's going to be to get to the bolts and what size...
SOURCE: volvo 850 smoke coming from exhaust manifold
Not to worry. Run the engine up to operating temp before jumping to conclusions and let the heat burn off any excess oil. A leaf will not do any damage.Do not let the engine overheat while idling and if the oil light comes on switch off immediately.
The smoke from the exhaust is oil deposited by oily assembly hands just burning off. It should dissipate after about 15 minutes at most.(or 5 miles' drive)
Testimonial: "yup kept running it and watching stopped smoking idle eventually smoothed out. only two problems left, bad o2 sensor (knew that before i started), and a high idle, ill worry about the high idle later. :)"
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