92 Vette LT1 no start
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
92 Vette LT1 no start
I just purchased 92 vette that had blown head gaskets and needed a top end rebuild. New parts: Injectors, Opti, coil, ICM, plug wires, water pump, valve covers, hoses and both coolant sensors. After putting it all back together it fired up and ran strong. Drove it for a few days with no problems. Was driving at 70 on the freeway and it started back firing and died. restarted and died. Made it off the freeway and was able to push it to a side road. Towed it home and it hasn't started since. Pulled codes 16, 41, 42. Replaced the opti and ICM again. Still no start. Fuel pressure good and can hear the pump prime and run. No spark from plugs or coil. Checked fuses all good.
Need some insight vette brothas.
Thanks in advance.
Need some insight vette brothas.
Thanks in advance.
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
Thanks Seabright.
Worked out great. Got the vette to fire. Now, checked fuel pressure. Hooked up pressure gage, KOEO 41 psi. Bled down instantly. KO, KOEO, no pump sound no pressure. Engine cranking, 41 psi, pressure bleeds off instantly. Gonna install a new filter and pump. Hopefully will be good to go,
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
I'm a little slow......... do you have fuel pressure, or is it bleeding down soon after starting?
Before replacing fuel pump and filter, read through the following link to see if it offers a solution:
https://www.corvetteforum.com/forums...ible-6spd.html
Before replacing fuel pump and filter, read through the following link to see if it offers a solution:
https://www.corvetteforum.com/forums...ible-6spd.html
Last edited by don hall; Apr 24, 2015 at 10:24 AM.
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
Engine will start for about 5 seconds then die. Both KOEO and while cranking, fuel pressure bleeds off instantly. I did install new injectors and a fuel pressure regulator when I did the top end 3 weeks ago.
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
Awesome post brotha. I'll do all those checks prior to purchasing anything. Thanks again. Will update as soon as I find anything out.
I'm a little slow......... do you have fuel pressure, or is it bleeding down soon after starting?
Before replacing fuel pump and filter, read through the following link to see if it offers a solution:
https://www.corvetteforum.com/forums...ible-6spd.html
Before replacing fuel pump and filter, read through the following link to see if it offers a solution:
https://www.corvetteforum.com/forums...ible-6spd.html
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
Checked out fuel pump. Stainer is completely deteriated and replaced it. Gonna check fuel pressure today. Started raining yesterday, SOCAL, figure the odds. Can't find the ground wire on the fuel pump, unless it's the black wire going to the pump it self. No change in the starting sequence. Starts and only stays running by pumping the throttle (gas peddle). Will change the filter today also. Don't think it's an issue, but I have one so I'll install it.
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Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
Update. New: Coil, ICM, fuel pump and filter. Just checked spark again today. No spark from plug wires or coil. Checked pigtail to Opti, receiving 12 volts. Checked ICM plug with test light hooked to positive battery post for ground. 3 out of 4 plugs test light lite up. WTF!!!! Any ideas. Love my vette and will not give up on her!!!
Checked out fuel pump. Stainer is completely deteriated and replaced it. Gonna check fuel pressure today. Started raining yesterday, SOCAL, figure the odds. Can't find the ground wire on the fuel pump, unless it's the black wire going to the pump it self. No change in the starting sequence. Starts and only stays running by pumping the throttle (gas peddle). Will change the filter today also. Don't think it's an issue, but I have one so I'll install it.
Thread Starter
Heel & Toe
Joined: Feb 2015
Posts: 19
Likes: 2
When the old timers say "check all wiring and grounds" do it!!!!! 
. Cleaned all the grounds, checked all the wires to and from the ECM. Opti went bad and replaced it under warranty. Found bad connectors on ICM, MAP, coil, TPS and Opti and replaced them all. Original issue was the ICM. It went bad and took out the coil. If anyone says that NAPA or Autozone can test anything, they're wrong. I also had my Service ARS light on and my tach wasn't working. Fixed the wires on the tach and replace all the brake fluid in the master. No light now. My Vette is running awesome!!! Took it to Smog
. Failed on all gases. Looks like I have a couple of bad cats. Also had a H13( BAD O2 sensor). Putting in new sensors as well. Hopefully it will pass now
. Cleaned all the grounds, checked all the wires to and from the ECM. Opti went bad and replaced it under warranty. Found bad connectors on ICM, MAP, coil, TPS and Opti and replaced them all. Original issue was the ICM. It went bad and took out the coil. If anyone says that NAPA or Autozone can test anything, they're wrong. I also had my Service ARS light on and my tach wasn't working. Fixed the wires on the tach and replace all the brake fluid in the master. No light now. My Vette is running awesome!!! Took it to Smog. Failed on all gases. Looks like I have a couple of bad cats. Also had a H13( BAD O2 sensor). Putting in new sensors as well. Hopefully it will pass now
Safety Car
Joined: Aug 2002
Posts: 3,842
Likes: 230
From: SANTA CRUZ CA
I just purchased 92 vette that had blown head gaskets and needed a top end rebuild. New parts: Injectors, Opti, coil, ICM, plug wires, water pump, valve covers, hoses and both coolant sensors. After putting it all back together it fired up and ran strong. Drove it for a few days with no problems. Was driving at 70 on the freeway and it started back firing and died. restarted and died. Made it off the freeway and was able to push it to a side road. Towed it home and it hasn't started since. Pulled codes 16, 41, 42. Replaced the opti and ICM again. Still no start. Fuel pressure good and can hear the pump prime and run. No spark from plugs or coil. Checked fuses all good.
Need some insight vette brothas.
Need some insight vette brothas.
At least, you have gained an education, that may benefit the forum at a later date.
