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Re: over heating after changing the head
Check to make sure that all air is out of the radiator. The best way is to remove the bottom hose let water drain. Then when refilling make sure you squeeze the top hose to make sure that there is not air in the system at all
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Both are not good to add on, because both increase the compression, which requires timing changes and premium fuel, and shortens engine life.
Superchargers cost more and use more gas, but last longer and don't have heat or lag problems.
Cheak to see that the coolant fan is operating with the A/C turned on. The fan has to work to help the engine stay cool and help the A/C. When you apply heat on the control it acts to reduce the coolant temp. You will have to get the coolant fan operation checked. This can be :fan motor, fan relay, temp sensor and computer. Good luck
Please post the odometer reading on the Sportage.
Most vehicle does not need catalytic converter and O2s until 120,000+ miles.
Before you cause damage to the cyclinder head,YOU MUST get the crack exhaust manifold reslove.
Keep running your truck with a crack exhause manifold will increase the heat on the valve/head.
The term burn valve is cause by un-even and excessive heat to one or more valves.
BAD vavle(s) will bend and not shut correctly.
It will cause the end to lose compression when the valve is not shut.
More noticable at higher RPM.
I will do a compression test and see is the compression is holding pressure.
The PSI reading should not be different beyond 20-25 psi between cyclinders.
50 psi below factory spec on all cyclinders will need a engine rebuild soon.
As long as the engine can start it will be with in 3-5 degree from spec. Timing is not your problem.
Please post the odometer and compress test reads and I will follow up on it.
if you have done all of this look under the cooling bottle where you put the ant-freeze and see if you have a crack in it and also make sure your cooling fan is ok and there is no play in the water pump and i hope it not your headgasket.
Possible head gasket. Need to remove cap when cold and start. While it is heating up watch fluid in radiator and see if there are bubbles, foaming or it is just shooting out the water. If so it is probobly one of the head gaskets. This is worst case of reasons. others could be low fluid, fans not working or just an air buble in system. But being that you said it happened in such a short drive, I would suspect head gasket. EJ25 motors are very good motors and will run surprisingly well even with a small head gasket leak. Good luck.