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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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Hard knock sometimes initial start up then it goes away within

Customer Question

hard knock sometimes initial start up then it goes away within a second but can be heard at higher rpm can hear clearly from under car right at flywheel or rear main area but not consistent while engine runs
JA: Figuring out why a car won't start can be a challenge - it could be a simple repair, or something a bit more complicated. Fortunately, the mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: it does start and i just explained what it does exactly hard knock at initial start that goes away instantly . runs perfectly no codes comes back in at higher rpm but not nearly as hard
JA: Are you hoping to fix this yourself?
Customer: yes my guess is either a flex plate [flywheel ] or possible torque converter or rear main ?
JA: Great! What have you tried so far?
Customer: oil pressure stays steady
JA: Is there anything else important you think the Chevy Mechanic should know about your Chevy?
Customer: has had all new intake gaskets , manifold , injectors and i use schaeffers s7000 semi synthetic oil and napa gold oilfilters
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and then connect you two.
Submitted: 1 year ago.
Category: Chevy
Expert:  Roy Scarlett replied 1 year ago.
Hello, my name is***** and I would like to try to help with your problem. What have you done so far to diagnose the noise?

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