Originally Posted by pizzaguy

THe whirriing sound can be bad bearings in the fan that pulls air from in the car to keep the box cool. The modules in that box cannot stand the terrible heat of the area under the hood, so they put a blower in there to draw air from the passenger compartment.

This "immobiliser" - what the hell is that? And how long ago did you have it taken out? Sounds to me like it is very possible that damn thing should have never been installed to begin with.

Other than that, being hundreds of miles from you (where ever you are) I'd suspect a bad battery or problems in the skreem module as pointed out above.

And this "We had the ecu tested and it came back fine" - I don't believe that.
First, I don't believe the ECU is bad.
Second, I don't believe anyone tested the ECU and you should not, either. How the HELL is someone going to test the ECU? I doubt mockups exist to do such a thing, other than to transplant it into another car and even that is questionable as I don't think the ECU from one car will "talk" to the CAN bus in another car, but I could be wrong there. (Where is Rudy when we need him?)

I will warn you of this, (and you can argue all you want to, but you came to US for help) - get a new battery. I have seen numerous, weird, unexplainable nonsense happen with these cars - all sorts of oddball crap - that disappeared with a new battery. And I've seen it on other vehicles, too.

I once had a damn Dodge Durango towed - it would start but when you released the key, it would die.
NOTHING helped. THen we swapped batteries between it and a van - they BOTH ran fine. We switched the batteries back - the Durango would not run!

Modern car electrical systems are VERY touchy and VERY complicated. This is not 1960 anymore.