What is your question?
After sitting for two or more days noise lasts 1 second. Same day starts there is no noise. 93k miles. Hydraulic lifters flat? Timing chain hitting cover?
What makes this problem better or worse?
when oil pressure rises.
How long has your 2011 Chevrolet HHR had this problem?
6 months
1 Reply
Hello, totally impossible to say until a trained technician listens to your noise and can weigh in. Metal on metal - momentary - sounds more like starter motor delayed disengagement from the ring gear on starting. Or even an engine accessory like an air conditioning compressor engaging for the first time. https://repairpal.com/auto-repair-near-me Click the link or call us at 877-913-1554. We'll gladly find you a certified RepairPal shop in your area.