Okay so over the past week my truck began making this terrible loud whining/whirring sound and began making a rattling noise from around the oil pan area. No engine light for low oil pressure or the gauge didn’t seem to be low. I was close to home so I finished driving home due to no alerts.
So, before I proceed any further; allow me to share that over the course of the past 5 or 6 weeks I have had the knock sensors replaced followed by the rear main seal. Anyways, I get home and open the hood to find that my oil cap was never put back on by the mechanic that replaced the rear main seal. Oil was 2 quarts low. I have a video of the loud whinning/whirring noise but not the rattling. Rattling only occurs when in drive going 25 to around 45 mph. So, I am wondering if this could be the oil pump? Or, any other suggestions? My truck is a 2002 chevy avalanche Z71 4x4 with a 5.3L and about 241K miles.
So, before I proceed any further; allow me to share that over the course of the past 5 or 6 weeks I have had the knock sensors replaced followed by the rear main seal. Anyways, I get home and open the hood to find that my oil cap was never put back on by the mechanic that replaced the rear main seal. Oil was 2 quarts low. I have a video of the loud whinning/whirring noise but not the rattling. Rattling only occurs when in drive going 25 to around 45 mph. So, I am wondering if this could be the oil pump? Or, any other suggestions? My truck is a 2002 chevy avalanche Z71 4x4 with a 5.3L and about 241K miles.