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Exactly which gasket did you change? There is a gasket on the valve cover and a gasket between the cylinder head and the engine block, the Head Gasket. It's the Head gasket you need to change. Then you need to flush the Oil system and the coolant system to clean them out.
Changing a head gasket is a Big job where you remove the top half of the engine exposing the piston tops. If the gasket has been changed 'several' times your probably looking at a cracked cylinder head or engine block, a VERY expensive repair. If this is the case it's usually easier to replace the whole engine.
White smoke is a dinner of a cracked or warped cylinder head, a cracked engine block, or head gasket failure usually caused by overheating. Take it to a mechanic.
Blue smoke indicates burning oil in the cylinders. Could be worn piston rings, worn valve guides, or bad valve stem seals. An engine compression test may help find it, but a cylinder leak-down test is a more precise way to find where compression is being lost. If compression is good, you just may need to replace the old rubber valve stem seals. A shop could do it without having to remove the cylinder head, using an air compressor hooked up into each cylinder while the valve train is being worked on. The air is used to keep the valves from falling into the cylinder while the seals are replaced. About a 4 hour labor cost, so expensive, but a lot less than a cylinder head removal.
Valve cover gasket , this is a common problem and its not the cylinder head it is held in by 6 bolts and is common to leak in to sparkplug area and causes misfire, your spark plugs wires are considered oil soak and you might as well get those replaced,
It means you have a blown head gasket or a cracked cylinder head. Its allowing the oil to mix with the water in the cooling system. You will have to remove the belts and accessory's in front of the timing cover, remove crank pulley, remove the timing cover and then timing belt. Remove all connectors, hoses and lines to the intake and cylinder head (Make sure to mark the hoses and connectors to there location for reinstall), remove the intake manifold if it makes it easier to remove cylinder head, if not leave it on and remove the valve cover, Remove the bolts to the cylinder head and pull it off with the intake manifold attached. You should see the gasket if it is not stuck to the bottom of the head. Installation is reverse. Have a Haynes Manual so you can have your torques and timing routing. Is it worth it, cost to replace head gasket verses another car, you have to make the call. I think so because I like no car payment and I know whats in my car. Get a salvaged cylinder head and new head gasket set, Total cost if you do the work yourself and get a good deal on cylinder head, 300 to 400 dollars. Shop cost 700 to 1500 dollars. Just a Ball Park
Sounds to me like the head gasket is blown, but there may be sealant in the system which is making it intermittently leak antifreeze into the cylinders.
A bad cylinder head gasket will also cause a compromise in compression, which will cause a lack of power.
Time to overhaul or replace the engine's head gasket, or replace the engine with one that doesn't have a blown head gasket.
Disconnect the negative battery cable. Remove and label all
electrical wiring, connectors and vacuum hoses necessary to gain removal
clearance.
Fig. 1: Loosen and remove the cylinder head cover retaining
nuts
Disconnect the PCV hose.
Remove the six nuts and seal washers from the cylinder head cover.
Loosen them in a crisscross pattern.
Remove the cylinder head cover and the cover gasket from the
cylinder head. Discard the gasket and replace with a new one.
To install:
With a wire brush or gasket scraper, remove all the old gasket
material from the cylinder head and the cylinder head cover gasket
surfaces.
When the cylinder head surfaces are free and clean, apply beads of
sealant to the cylinder head in the locations shown in the accompanying
illustration.
Fig. 2: Be sure to apply sealant on the cylinder head prior
to cover installation
Install the new gasket in the cover. Make sure that the gasket
seats evenly.
Place the cover with the gasket onto the cylinder head.
Install the six nuts and seal washers. Tighten the nuts to 65 inch
lbs. (8 Nm).
Connect the PCV hose. Connect all removed vacuum hoses, connectors
and electrical wiring. Connect the negative battery cable.
Start the engine and inspect for oil leaks. Repair any leaks as
necessary.
no-just make sure you remove the pin that secures the inner guide rail. The banana rail isn't secured on the head. If the inner guide rail breaks then you will have to remove the bottom front cover to replace it so be careful.
This is not a good question to ask.....I take it that you must not be too mechanically inclined...no offense. is this a v6? A head gasket is between the head(s) and the block. If a head gasket is bad (blown), then it is a very major job to replace. And hoping that your head is not cracked, which is sometimes possible. It is like tearing the engine apart, except for the crank and pistons (bottom engine) head gasket is on the top half of the engine. I would estimate that this job would cost you over $1000. without cost of parts. ???
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