I am new to posting on this forum. I typically reference it when reminding myself the usual tools I need to do an oil change, or when I was looking up instructions on how to change the thermostat.
I currently own a 2007 Pontiac Solstice GXP that just hit 90,000 miles today (Pic attached
). It is a 5 spd manual, no aftermarket mods. I am currently trying to get the car ready to be sold later this year as I am wanting something with back seats.
A little history first: Back in August of 2018, I was in some heavy stop-and-go traffic on an 80 degree (f) day. I had the A/C on at the 2 level with air blowing through the top vents and the feet. When the opportunity presented itself to get back on the highway, I pushed down on that gas pedal and pushed the RPMs to the limit both in first and second gear to get around traffic. Roughly around 15 minutes later, a humming noise began. The humming noise is only present at or above 2500 RPM, regardless of the speed im going. It is heaviest and longest sounding at lower speeds when the RPMs are highest, then the humming is at its quickest, and most repetitive intervals at above 65 mph. Sitting at 60mph causes NO humming. It almost feels like it is coming from the passenger side.
Since this noise has started, I got an alignment done in October of 2018 that did not fix the problem, but it fixed the pulling of the wheel when trying to stop. When the weather here in Ohio got colder, the humming stopped. Now that it has gotten warmer, the humming is back. There is no loss of power, fuel consumption, wheel pulling, or handling. Yesterday, I did an oil change using the same brand of full synthetic (Mobil 1) I have been using since day one of owning it (2014 20,000 miles). I also replaced the spark plugs yesterday. In 2019 so far, I have replaced both front brake pads, calibers and rotors, and in November of last year, the ECT sensor and thermostat.
I have searched the internet consistently to see what this could be and found it could be any of the two things: Something to do with the exhaust or a wheel bearing. My past experience with a wheel bearing (2000 Pontiac Grand Am) was when the humming noise only occurred when making turns, which a few months later developed into a loud cracking noise - entire front end suspension was shot) I am no mechanic, so diagnosing issues is not my strength, but doing the actual work is easy. This car is extremely easy to work on with my tiny hands. I am wondering if anyone has a clue on what I could do to diagnose the issue. I will try and get a video recording of the issue today, should my phone pick up the humming.
I do not trust taking my vehicle to a mechanic as the last time I did for a full synthetic oil change and routine inspection, the mechanic somehow snapped off my Air intake Sensor at the plastic piece that connects to the Air Intake itself. And mechanics around here usually charge $110+ just to look at it. I respect having to charge for an inspection, but the risks are too great. I just took the car in for the recall on the passenger airbag, and the dealership broke something in the seat, now it doesn’t stay up if braking really hard or just simply pulling the seat forward.
Thanks for the advice and assistance!
(PS, if this post shows up twice, I apologize. I posted this a while ago and noticed it did not show up. I tried looking over the Terms of Service to see if there is some sort of delay but couldnt find the information)