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93 z28 bangs when starting

Old 02-23-2019, 11:18 PM
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93 z28 bangs when starting

I went to go buy a 93 z28 and when the guy started the car there was a loud pop. The guy said itís the starter and that it has done every time he starts it since he owned it. Before buying the car I wanted to check to see if anyone had an idea of what that is.
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Old 02-24-2019, 07:07 AM
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Re: 93 z28 bangs when starting

Can you describe the sound more? Are we talking backfire? Or does it sound like parts banging together?
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Old 02-24-2019, 08:20 AM
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Re: 93 z28 bangs when starting

Originally Posted by JakeRobb View Post
Can you describe the sound more? Are we talking backfire? Or does it sound like parts banging together?
I thought it sounded like a backfire. It only happened when we started the car and didnít happen again
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Old 02-24-2019, 09:57 AM
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Re: 93 z28 bangs when starting

Was the engine cold or hot when the owner started it? The starter wouldn’t cause a backfire (popping in the intake manifold) or popping in the exhaust. It is more likely a problem with unburned fuel in the system, a valve hanging open, or an ignition timing error.

Is the engine basically stock, or has it been modified? If modified, what was done to it?
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Old 02-24-2019, 04:13 PM
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Re: 93 z28 bangs when starting

Originally Posted by Injuneer View Post
Was the engine cold or hot when the owner started it? The starter wouldnít cause a backfire (popping in the intake manifold) or popping in the exhaust. It is more likely a problem with unburned fuel in the system, a valve hanging open, or an ignition timing error.

Is the engine basically stock, or has it been modified? If modified, what was done to it?
he said it has a 93 gas tune and he said the gears were changed on the car. It could have been a different noise than a backfire and the popping noise was from the engine bay. The guys had driven the car about an hour before we got there so it probably was cold. I think the car needs a new opti based on how it drove. Idk if that could cause a popping noise on start up though. It also needs a new tranny mount but I donít think that would cause a pop on start up.
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Old 02-25-2019, 09:35 AM
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Re: 93 z28 bangs when starting

Could be the rotor in the Opti is cracked or coming loose, or carbon tracking in the Opti = timing error.
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