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Bunker Hill, WV
ALLDATADIY.COM............................Not free but lots cheaper than those annoying $100.00/hour clowns!.......................Oh .....wait , I'm a clown............dammit!
You don't want the codes to 'blow' , you want them to 'set' gently , and then analyze the live data to find the source of the problem. Probably best to have the scanner on it when it acts up , if it's not triggering a DTC. Watch live data , while it's running and unplug MAF-see what happens. Post results.
Bad cable contact or bad cell in battery . .....Turn on headlights and with them on see what the reaction is when you try to crank it. No reaction - open in starter circuit ? Click and lights go off- bad terminal connection , - dimming, high resistance somewhere in circuit..
Have the harness to the knock sensor checked for damage , after that is resolved , clear codes and monitor rear O2 sensor function to verify proper operation of sensor and that will verify if you do in fact need a converter.
Let the car sit and idle til the rad. cooling fan(s) cycle on , then tell us what it does. AND you are using the proper MIX of coolant/anti-freeze , not just water , right??? Is the lower rad. hose getting hot? Thermostat in correctly?
Has the hood been opened yet? Either large plastic engine cover will say it , or an emissions label under the hood. SOME places can actually determine the engine goung by the VIN#.
Depends on what the actual cause of the noise is. Is the fan blade damaged anywhere? Even a small amount of damage to the blade could cause an 'out-of-balance' vibration/noise. Is the fan motor itself squealing intermittently? If your getting the complete assembly get it at a store such as NAPA ,not 'Pep-boys or advance.
Might want to take a peak under there yourself...............not what your machine repair tech is imagining.
Did the noise go away when alt. originally changed?
Recharge with a machine. Regardless of the original problem , it should be ; Recovered , vacuumed (30 min.) and then charged with proper amount of refrigerant. Store bought DIY may be more headache than you want.