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I have a 2002 nissan sentra gxe last night it just started to lose power when I would slow down it would idle rough I just replaced the head gasket about 1 year ago what else could be the problem???
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Big difference between valve cover gasket and head gasket. To replace head gasket, you must dissamble top end of engine and send the head out to be resurfaced and then install new head gasket. If it is a leaking valve cover it is much easier. Simply dissasemble and then clean valve cover and top of head from all debris and remove all old gasket material. Tighten back down in sequence and do not over tighten. these small bolts can be overtightened easily so go in sequence just like when you tighten lug nuts by skipping one as you go around. 10mm bolts require about 10 pounds or less torque.
It you're losing coolant and it overheats, that's a sign of a bad head gasket. Get that checked before you spend any more time or money on anything else
look on the back of the intake manifold, there are 2 or 3 ground wires that bolt to the back of the manifold. they ground the park netural switch and body control module if they are not hooked up or are loose it will cause this problem
I hate to be the barer of bad news, but may be the head gasket.
My car started with rough idle. Then very hard to start in cold weather. Next started overheating, but no output from heater. Trickling sound from behind dash board. Overflow bottle overflowing.......
I replaced the water pump, radiator cap, thermostat, coolant, fan belts, power flushed the system. Nothing worked. Some research gave me the answer.
The head gasket leak was allowing exhaust gases to enter the cooling system, displacing the coolant. After use, as engine cools, coolant is sucked back into the system and coolant seeps into the cylinder. This gets worse over time.
First thing you'll notice is the rough idle as the spark plug burns off the coolant in the cylinder. (This is especially true at low temperatures.) If it is the head gasket, the other symptoms will follow as time goes by.
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