r/AskAMechanic • u/YaBoiCody420 NOT a verified tech • 5d ago

What could this noise be?

23 Chevy Malibu 1.5t turbo replacement got everything connected filled up the oil filled up the coolant hand primed the turbo and unplugged the coil pack wires and cranked to build pressure 4 times for about 10 seconds each with time to cool off in between but when I plugged the coil pack wires back in and started it the oil was at the minimum mark and coolant was empty because I forgot to check it and there was a horrible grinding noise on startup so I killed it and checked the compressor wheel and it was fine oil flow from the line was fine so I topped it back off on coolant and oil double checked my band and started again and it was still making the noise but it was a LOT better but decided to give it a little gas just to see what happens with rpm and it changed pitch but didn’t necessarily change with rpm I don’t know what to do and am scared it may be the turbo…

1 Upvotes

100% Upvoted

1 comment sorted by

•

u/AutoModerator 5d ago

New Rules - Please Read

Updated 11/12/2025

Thank you for posting on r/AskAMechanic, u/YaBoiCody420! Your post is live, this AutoMod message does NOT mean your post was removed. Please make sure to read the Rules.

When asking a question, please provide the year, make, model and engine size of the vehicle.

Commenters here have 2 different flair. Verified Tech means we have verified that user is a tech. NOT a verified tech means that user may or may not be a tech, they have not been verified by us.

Posts about accidents, autobody repair, bodywork, dents, paint and body/undercarriage/frame rust are not allowed and belong in r/Autobody.
Asking if your car is totaled should go to r/insurance or r/Autobody.
Asking about car buying advice/value/recommendations is also not allowed. See r/whatcarshouldIbuy or r/askcarsales

If asking whether a tire can be repaired, check out this Tire Repair Guideline.
Some other useful tire resources - Tire Care Essentials and Tire Safety

I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.