2008 Trailblazer 4.2, 85,000 miles.
I posted this topic on another forum as well, but wanted to get a few more opinions. I noticed this noise about a month ago when idling but also when the gas pedal is slightly touched. The noise is more noticeable on the passenger side. In the video you will hear the chirps at 3-5 seconds and 24-40 seconds. I had my wife rev the engine a couple times during the video.
I just changed the belt, tensioner and idler pulley and that changed nothing on the sound. I switched from a Gates belt replacing with a Dayco, along with a Dayco tensioner and idler pulley. With the vehicle running and belt on I am hearing occasional chirping and even more chirping when in drive and just touching on the accelerator, then chirping seems to disappear when further pressing down on the accelerator. I used a mechanic stethoscope but still canít pinpoint where exactly the chirping is coming from. Car running with no belt, no noise.
The chirping seems to be coming from the passenger side, perhaps near the power steering reservoir. The power steering pulley seems to occasionally be making a slight noise but I canít be sure. Turning the wheel from side to side does not change the chirping and I donít have any loss of power steering fluid. Annually I suck out the power steering fluid and replace.
Original water pump, fan clutch, ac compressor and power steering pump.
Iím guessing my problem might be the power steering pump but that is a guess. Any thoughts on the cause? Also, is this something I should wait to fix, see how it develops, or fix now? Thank you
Video of my problem: