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Q: There is a humming noise thats coming from under the car at 2100rpm idle. on 2000 Toyota Solara

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Took it to Autozone to check it, they said its in the evap system, something could be clogged or fuel cap. Took to a mechanic, 2nd time he cleared it @ it never comes back on, now. But I told him before he cleared the light, I smelled "gas in the oil" when checking the oil. Im surely thinking he's bypassed something in the circuit to make the light NOT come back on, cause he viewed me as a pest, though I asked him to fix it.?? Few wks later, In any case Now the car whines off and on somtimes kinda loud just from underneath,as it resonates and you cant pinpoint it.. Till the other day when I took it to a muffler shop that put it on the lift and found a egr thing located under @ by the gas tank. He jiggled it @ it quit making the sound. Thinking a solenoid may had been stuck..? Though it,the noise, came back 2 days later, "today." Any Advice or similar happenings that I might can do to FIX Myself. It shifts out fine.. And it has 203,870 miles. Has New plugs,timing belt, belts, fuel filter, radiator fluid changed, and hoses too.. just saying. Excellent condition.
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I suspect a valve or solenoid on the charcoal canister for the evaporative emission system is having a problem. You had mentioned the possibility that it may be an EGR related problem but the EGR valve and solenoid switching valve are in the engine compartment. It would be important to note the trouble cods stored but the evap canisters do give problems.
I Thank You for your time sir!! Thanks for the reply. I now take back the oil is smelling of gas, as I eat my words, after having the oil changed 500 miles ago and smelled it today. There is NO smell of gas in the oil. The mechanic I believe cleared the clogged line for me. I guess. Though the code, it may have been code po440,or po446. I was just speaking in reference to the "noise" as far as location. In any case, I never knew of him repairing the problem as I now believe he did as there is No "check engine" light or smell of gas in oil. However, Thank you, and for any advice, anyone may could give me on the "noise" issue. Today, I had it diagnosticly tested for All evap system operation/function and All checked out Fine...
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