Question about 1998 Chevrolet K1500

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I have a 1998 Z71 that got overheated, when the engine is cranked it has a miss and the radiator gets back pressure, I believe it is a blown head gasket and possibly cracked or warped head or heads. what should i do to troubleshoot?

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Get a cylinder leak down test kit and you'll pressurize a cylinder and look for air bubbles in the radiator. sounds like a headgasket to me though

Posted on Nov 16, 2009

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Posted on Jan 02, 2017

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Hi,
If the head gasket was blown by overheating, it could have ruined the engine bearings, which could keep it from running.

GL,
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I just put a brand new radiator and radiator cap in my car and its still over heating and now its misfiring what could be causing this?


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.

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Have a 1998 chevy camaro V6 and in 2007 had overheating problems and mechanic nickel and dimed me where it by the third time overheating and taking it back engine was toast and replaced engine block. New...


You never said if the heads were resurfaced or not. That copper stuff is a gasket and radiator sealant. It can plug up several tubes in the radiator. Check for a blown head gasket this way. Take the radiator cap off on a cold engine. Start the engine and watch for coolant to travel by looking in the radiator. When the thermostat opens, the level will do one of two things. 1) it will spit out and overflow out the filler. This would suggest a blocked radiator. 2) the level will drop and you will see the tops of some of the tubes in the radiator. If some of them are plugged, then a rerod of the radiator is needed. if there are bubbles in the coolant, this indicates a warped head or a blown head gasket. Anything you find won't be cheap to repair.

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You need to get a pressure check on the cooling system. I suspect a bad head gasket. Engine compression leaking into a water passage would force coolant back out of the engine. Hope this helps.

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Believe it or not, new thermostats can be bad. Did you maybe get some adhesive on the thermostat preventing it to open fully? Is the thermostat installed with the crown up? The only other thing that I can think of, if it's a closed cooling system and the wrong radiator cap is installed, it won't hold the pressure, therefor overheating. The other thing may be the water pump. Many times the impellers will wear down internally causing to low of water flow.

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When it overheated you may have warped your cylinder head(s) and now coolant got into one or more cylinders. Take out your plugs and crank your engine and take note of any liquid being shot out of any cylinders. If you have a compression gauge, put it in each cylinder and crank the engine until you get the highest reading. Watch the gauge and if you see the pressure dropping, you have a pressure leak probably from a warped head from overheating.

Note: Never remove a spark plug from a hot engine if you have aluminum heads.

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