Hi, I’m Chris. Welcome and thanks for asking your question!
If you raise the rpm does the oil light go off?
Is the coolant temp registering normal?
Have you taken a actual oil pressure reading at the engine?
Have you checked using a scan tool to see what the coolant temp is?
If you run the correct oil this engine calls for, do you still get this same issue?
Were there any oil pressure issues prior to this repair?
Why did you need to replace the heads?
Thanks for the reply Jemayel.
You need to check the engine oil pressure at 2500-3000 RPM using a pressure gauge. Pressure should indicate a reading of 40-60 psi. Also check the engine coolant temp since even slightly high coolant temps can turn on the oil light as well as result in noise. The coolant should be staying below 210. If the oil pressure fails the test then the engine needs to be pulled and the crank bearings inspected for wear. If not worn then replace the oil pump. If the bearings are worn from coolant being i n the oil, then the engine needs to be replaced with a short block.
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There are not trouble codes available in this computer for low oil pressure. The only component which knows the oil pressure is the instrument cluster and it does not tell the computer of low pressure. It only warns the driver.
You need to remove the oil pressure switch and thread in a hose adapter and gauge.
The switch is mounted at the end of the head against the firewall on the drivers side of that head.
Yes, no thermostat will cause an engine to run to hot. Since the oil light can come on with high coolant temps you need to check the coolant temp like I mentioned prior.
The oil light can flash or turn solid, both indicate a concern with oil pressure or high coolant temp.
The thermostat stops coolant flow so the coolant in the radiator actually has time to cool off. If the coolant just flows through the radiator fast without stopping it just continues to get hotter and hotter.