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Corvette C4 Forum 1984 through 1996

1993 help won't start

  #1  
Old 03-15-2015, 12:22 PM
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Default 1993 help won't start

I have. 1993 convertible ran fine. My son drove it home now won't start if I hold the throttle to the floor it will almost fire but won't actually start thought it might be the throttle position so I changed it it did not help? Please help
 
  #2  
Old 03-20-2015, 06:08 AM
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Welcome to the forum.

Check the fuel pressure w/ the key on, engine off.
 
  #3  
Old 03-21-2015, 08:01 AM
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What should the fuel pressure be?
Originally Posted by 73shark View Post
Welcome to the forum.

Check the fuel pressure w/ the key on, engine off.
 
  #4  
Old 03-27-2015, 08:23 PM
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Somewhere in the 50-60 psi range
 
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Old 04-01-2015, 07:49 PM
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Fuel pressure checked 42 and blead off to 20 within about 5 min. So I replaced the fuel pump and strainer still same condition? Same fuel pressure and bleed. Any other ideas as what it could be? Driving me crazy.
Originally Posted by 73shark View Post
Somewhere in the 50-60 psi range
 
  #6  
Old 04-02-2015, 10:45 PM
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Need three things to run, fuel, air, and spark. You are lacking one or more of these.

Any DTCs?
 
  #7  
Old 04-03-2015, 06:56 AM
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I have fire but can the optispark fail intermittently?when I pull the codes I get none.
Originally Posted by 73shark View Post
Need three things to run, fuel, air, and spark. You are lacking one or more of these.

Any DTCs?
 
  #8  
Old 04-03-2015, 09:13 AM
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I have read where the Optispark is the weak link on that model. It was subject to failure due to water getting into it. it sounds like it might be time to replace it.
 
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Old 05-24-2015, 07:40 PM
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Could be your fuel pressure regulator. I believe it's on the rail. It has a diaphragm in it and could be leaking.
 
  #10  
Old 05-25-2015, 07:03 AM
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Default Opti-spark

Originally Posted by blueshark View Post
Could be your fuel pressure regulator. I believe it's on the rail. It has a diaphragm in it and could be leaking.
Thanks for the helps. It turns out it was the opti-spark they can fail partially I still had had a strong spark at every cylinder but as soon as I replace it she came back to life
 

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