?? regarding 1992 corvette
 

My son has a 1992 Corvette--- just an everyday car NO MODS!!! lately the engine has decided to run rough then smooth out and sometimes even quit--let it set a few minutes starts right up and drive it away engine running smooth--- let it idle in the driveway might run for 10-20 minutes then act up then run smooth out then all of a sudden die--we have checked the obvious plugs-wires--coils--fuel filter-ECM---put it on a Code Reader threw a voltage code once checked that out Alternator was bad voltage all over the place replaced it--replaced the Opti spark unit the whole thing cap rotor even the distributor---cannot find anything that will do this--- he's having fits over this I know nothing about these computer cars--could the computer be bad ??? Anybody got any ideas??? He has a Camaro same engine absolutely NO problems with it so far-- I'm out of suggestions THnax guys FED 387

Re: ?? regarding 1992 corvette
 

Just an idea . Can you install a fuel pressure gauge on the fuel rail and monitor the pressure when it has it's problem ?

Re: ?? regarding 1992 corvette
 

Suggestions, look closely at the secondary wire between coil and distributor. Look at coil terminal for corrosion or carbon tracking.

Swap the ecu relay with the relay from another component that uses the same relay.

Another possibility is the primary connector at the ignition coil. It is a known issue for the primary connector to break internally. A replacement "pigtail" is available.

Re: ?? regarding 1992 corvette
 

Check all your sensors. I had a mid '80s vette with a bad temperature sensor. It kept telling the computer the engine was cold and the computer would send too much fuel, causing similar symptoms as you described.

Re: ?? regarding 1992 corvette
 

thanx for the answers we will check them out get back to all with our results--FED 387

Re: ?? regarding 1992 corvette
 

another thought, use a fully capable scan tool that will show all live data, pending codes and history codes

Re: ?? regarding 1992 corvette
 

I second this. My father in law has replaced more temp sensors than he can remember. Cheap and affects how it idles/runs/mileage, etc.

Re: ?? regarding 1992 corvette
 

The high tension coil wire is a common problem with the LT1 cars. I used to keep one on the shelf when I had my shop open. Check the coolant temp on your scan tool. An open in the sensor, or connector indicates -40 deg. That should be black smoke on start up. Same as the choke shut tight on a carb.

Re: ?? regarding 1992 corvette
 

You might want to check the fuel injectors, that era was bad about heat on them. Original injecters had issues, cold run & start perfect till you get underhood temp. To them, hope it helps.......good luck!!!!!!!