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Re: Power train loop P04...
I would suggest you check the knock sensor and the egr operation as the knock sensor should send information to the computer to correct the ignition timing and the egr malfunction will prevent the temperature of the combustion chamber to lower thus producing more oxides and the temperature goes higher.
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Squealing is most common with loose or worn belts, I would start by replacing the drive belt on the front of the motor and go from there, Its easier to troubleshoot a squealing motor if you know that the belt or belts are good.
you may have overheated engine and not known it because if no water is present on temp sensor it will not show hot sounds like overheating of bearings in lower end possibly major engine repair may be needed
hi there. the reason that the engine idles good when the air-con is engaged is that ussually all vehicles nowadays have a vacumm advance mechanism. this is triggered mainly by a electric solenoid valve which is also attached parallel to the source supplying power to compressor. a small vacumm hose with a diameter like a common pencil or ballpen case. its made of rubber and it runs from the alternator vacumm pump then to the solenoid valve and to the vacumm advancer unit attached to the injection pump throttle. this system raises the idle a tad higher.
if your montero runs completely normal and you experience no other problems with your engine except for your present problem, then the solution is just raising the idle a little higher. if your montero is equiped with a RPM guage on the dash, try adjusting the idle to around 800 rpms. it would be healthier for your car if the idle raises a bit when you engage the air-con because this would compensate for the added load on your engine.
The engine is probably making a knocking sound because the oil needs to be changed or replaced. The check engine light is indicating that you will need regular dealership servicing soon, however you can still drive the vehicle but depending on mileage it will determine what services are required.