I’ve got a 2009 Pontiac Vibe GT. A few days ago, my battery went dead when parked and listening to the radio. The terminals looked corroded but we jumped it and it was fine. Monday, my friend removed the connections and cleaned the terminals. The next day, I noticed that upon starting it, there was a noticeable rattle coming from the rear area of the car. Once I hit the gas, it’s fine, and after a 50 min interstate drive it seemed fine. However, leaving work today it happened again-- a rattling when stopped at red lights or stop signs. Once I hit the gas it goes away, but starts on again as I slow to a crawl.
Is the battery issue a red herring? What could be the cause of this?
Thanks in advance for your help!