Blown head gasket or not?

Blown head gasket or cracked block

Did you replace the thermostat? How long does it take to overheat? Is there water coming out of the tailpipe? Do you have to keep adding water to the radiator?

Sounds like a blown head gasket from the engine miss. Pull the spark plugs, if any of them are kind of a bleached white on the electrode then you've got water in that cylinder and either a blown head gasket, cracked head/block, or a combination of those.

Good Luck!

Compression is what happens when the piston comes up and compresses the fuel/air mixture. Then the spark plug ignites it and the explosion drives the piston down in turn, turning the Crankshaft in turn making the car go. A compression leak is when this compressed fuel/air mixture is escaping from the combustion chamber.. This can happen 3 ways. 1. Bad piston rings, 2. Blown head gasket or cracked head or block, (usually caused by overheating), Or the least costly.. loose spark plugs.

Use engine silicon sealant as well as gasket. Best used with new gasket. Also check tightness of rocker cover retaining screws.

usually its a head gasket if not valve seals if the oil in the head is creamy thats antifreeze blown head gasket if it got to hot it will worp the head needs to be machined before you put it back together or worn out piston rings

Did you bleed the cooling system? and check operation of the thermostat, which should have been done after fitting radiator before finishing by putting on radiator cap.
If not remove radiator cap when cold get vehicle warm and check thermostat operation, while bleeding any air pockets in cooling system and if no flow and bubbles or it starts to boil (shooting water) out of radiator the thermostat could be jammed or head gasket blown.
Sounds like it could be a blown head gasket. Get it hot again and miss firing, remove and inspect all spark plugs you may find a very clean spark plug indicating water entry into that cylinder or even water/coolant droplets in spark plug. You can also hold paper over spark plug holes and give the engine a quick crank over to see if any water comes out of cylinder while cooling system is still under pressure, or use radiator pressure tester to pressurize cooling system, wait 5-10 minutes and then crank over checking for water/coolant in cylinders. Another tool to check for blown head gaskets that cause overheating is a TK Head check, which sniffs the cooling system for evidence of exhaust fumes in cooling system.

Check for possible water in oil, also remove radiator cap and start engine does water want to pump out of radiator, is there white smoke coming out of tail pipe, if yes to any of those blown head gasket, if not sure yet remove spark plugs crank engine over is there any coolant coming out of spark plug holes, if yes blown head gasket, and last have a block test any repair shop can do this.Good luck

i think that u have problem with your valves, go to mechanic and ask to thighten tham

sounds like you blowen head gasket

I had this happen recently to our Buick rendezvous. Unfortunately it was due to a blown head gasket. It goes away when warm due to the block expanding. Coolant was getting through into the cylinder. Hopefully this isn't your problem but the same symptoms. We had replaced plugs, wires, and an 02 sensor before comfirming it was a head gasket. Luckily ours was covered under warranty.