1992 corvette
joe

United States

#1 Oct 25, 2010
general motors biggest flops, 1992 93 corvette electrical no start coditions normally consist of ecm bcm and ccm problems and all the hot shots whant a shot at your bank account and always able to tell you how to fixit in reality the repairs cant even be fixed by chevy because they dont no ware this factory defect is located oh ya they can take your car apart and tell you things all day long as long as your paying they will keep talking show me a man that will put your money ware his mouth is at. with acant fix no pay, policy. see i dont care what the problem is i just whant it fixed talk is so cheap except at the repair shop.
vette guy

Miami, FL

#2 Oct 27, 2010
joe wrote:
general motors biggest flops, 1992 93 corvette electrical no start coditions normally consist of ecm bcm and ccm problems and all the hot shots whant a shot at your bank account and always able to tell you how to fixit in reality the repairs cant even be fixed by chevy because they dont no ware this factory defect is located oh ya they can take your car apart and tell you things all day long as long as your paying they will keep talking show me a man that will put your money ware his mouth is at. with acant fix no pay, policy. see i dont care what the problem is i just whant it fixed talk is so cheap except at the repair shop.
The bcm and the ccm are the same part, and it likely isn't the cause of a c4 corvette not starting. The ecm may be.

Concerning the bcm, I've been trying to locate a rebuildable unit for my c4 Corvette for a few months now. The other option of having my own bcm rebuilt (assuming it can be rebuilt) while my car sits out of service for a feew weeks is not palatable. GM has been reluctant to give out vital programming info to rebuilders, and no new units exist anymore. BCM failure is very common in these cars.
nancy d

Gadsden, AL

#3 Jul 5, 2012
this is to vette guy.....you sound like you know about this non starting problem. I replaced my ECM but she still won't start....what next? A friend said he thinks it's the fuel pump. It will start with starter fluid but will not keep running on it's on. Any suggestions before I have to have her towed to a dealership where I know, I'll spend alot of money....please help...
motown guy

Lincoln Park, MI

#4 Oct 15, 2012
vette guy wrote:
<quoted text>
The bcm and the ccm are the same part, and it likely isn't the cause of a c4 corvette not starting. The ecm may be.
Concerning the bcm, I've been trying to locate a rebuildable unit for my c4 Corvette for a few months now. The other option of having my own bcm rebuilt (assuming it can be rebuilt) while my car sits out of service for a feew weeks is not palatable. GM has been reluctant to give out vital programming info to rebuilders, and no new units exist anymore. BCM failure is very common in these cars.
i know this is an old post but just fyi there is a place right down by you that rebuilds pcm's! its in hollywood fl forgot the name just google rebuilt pcm hollywood fl and it should come up! just tell them year and your vin# and they can rebuild yours or exchange one with you.
motown guy

Lincoln Park, MI

#5 Oct 15, 2012
also the problem my be the opti spark system! they are known to fail because of the location they where put in the lt1! its right behind water pump!
motown guy

Lincoln Park, MI

#6 Oct 15, 2012
nancy d wrote:
this is to vette guy.....you sound like you know about this non starting problem. I replaced my ECM but she still won't start....what next? A friend said he thinks it's the fuel pump. It will start with starter fluid but will not keep running on it's on. Any suggestions before I have to have her towed to a dealership where I know, I'll spend alot of money....please help...
opti spark system!
Darrell S

Granite Bay, CA

#7 Mar 17, 2013
I had the same no start problem with my 92 C4 LT1. Everyone told me it was the distributor but by using the test procedure in the factory shop manual I found it to be a faulty ignition module which is mounted behind the coil at the front of the right cylinder head.
Big T

Woodridge, IL

#8 Sep 16, 2013
Heater core will go early

opti spark will go

stock injectors will go - as they are not made to handle ethanol in gas.

Bose radio will go.

will need to upgrade a/c as r12 is no longer used.
Ray Lewis

Indianapolis, IN

#9 May 6, 2014
How can we diagnose a problem 1992 corvette - right window went down - will not go up working window switch on either door.
Took Switch out - six wires - which one should light when working right window - appears power constent to the brown - blue - orange and blue with white wires.
Ray Lewis

Indianapolis, IN

#10 May 6, 2014
problem with diagnoising right window problem - window went down wil not go up using switch on either door.

took switch out - power to brown, blu, orange and blue with white wires.

can we bypass the switch to see if motor is okay.
Gene Corvette Man

Santa Cruz, CA

#11 Oct 13, 2015
Had the same no start problem with my 92 c-4 Corvettevwith 105k miles. Dealer sent my ecm to Delco 3 times to get rebuilt. Corvette still wouldn't strart. Car was at the dealer for 3 months and thevdealer checked every reason why my car wouldn't start. Turned out that Delco finally said they couldn't fix the ecm box. Got lucky and found an ecm box on line. Went to the dealer and said, put in the repayment ecm and see if the car will start. Guess what, the car started and runs perfect. Now I'm waiting 60 day for GM to refund me for 3 ecm charges under their warranty agreement.
Seems like many Corvette owners are having the same no start problem. And, GM doesn't made a replacement ecm part., so the dealers have to send the ecm box to Delco to be rebuilt.
Problem, my ecm box is worn out like an old tv after 100k miles. My opinion, the ecm box is in the hot engine compartment and the engine heat burns out electronic parts.
So, the ecm box has to be rebuilt if you're lucky.or replaced.
Wondering how many 92-95 Corvette owners are having a similar problem. Does this warrant a class action against GM to leave Corvette owners without a fix and a car that doesn't start.
The car isn't worth anything when it won't start.
Gene Corvette Man

Santa Cruz, CA

#12 Oct 13, 2015
nancy d wrote:
this is to vette guy.....you sound like you know about this non starting problem. I replaced my ECM but she still won't start....what next? A friend said he thinks it's the fuel pump. It will start with starter fluid but will not keep running on it's on. Any suggestions before I have to have her towed to a dealership where I know, I'll spend alot of money....please help...
Had same problem, no start, ecm box rebuilt 3.times and still didn't work and no engine start. Desperate, found an on line ecm box, and hadn't installed, and enginevstartedvandvcar runs fine. Looks like my ecm box box just burned out since it's installed up in the engine bay. The box gets real hot, and GM has relocated ecm boxes out of the engine bay on newer model Vette's.
Hope these comments help owners with a similar no start problem.
Gene Corvette Man

Santa Cruz, CA

#13 Nov 17, 2015
Gene Corvette Man wrote:
<quoted text>
Had same problem, no start, ecm box rebuilt 3.times and still didn't work and no engine start. Desperate, found an on line ecm box, and hadn't installed, and enginevstartedvandvcar runs fine. Looks like my ecm box box just burned out since it's installed up in the engine bay. The box gets real hot, and GM has relocated ecm boxes out of the engine bay on newer model Vette's.
Hope these comments help owners with a similar no start problem.
Reply to Nancy d from the Corvette guy. Yes, GM is going to settle out to me for 3 non working ecm rebuilds from Delco. I've been trying to figure out how to get my car running right for the last six months. Final my car runs by replacing my ecm box. Finding a replacement ecm box is really hard. Most don't exist ne or used.
Gene Corvette Man

Santa Cruz, CA

#14 Dec 8, 2015
Gene Corvette Man wrote:
<quoted text>
Reply to Nancy d from the Corvette guy. Yes, GM is going to settle out to me for 3 non working ecm rebuilds from Delco. I've been trying to figure out how to get my car running right for the last six months. Final my car runs by replacing my ecm box. Finding a replacement ecm box is really hard. Most don't exist ne or used.
Reply, GM did the right thing. They sent me a check for the 3 times Delco didn't fix my ecm box. The dealer helped assist me in getting a check from GM. Now I want to find a spare ecm in case the one I bought on e-bay gives up.

My suggestion, have your oxi spark unit at the front of the engine checked. If your lucky, your mechanic might get an error code. in my case, no error codes were given out. This is the distributor unit which is located under the water pump. Any leakes in the water pump or moisture can short out the oxi spark and shut off the ecm box, and your engine won't start for 10 or 15 minutes.

Also, check all ground wires. The 92-95 corvetts have 3 ground wire locations. One to the frame, second one uner the battery, and another one to the frame. Also, check your coil. Make sure any after market alarm systems are working correctly as no to interfere with the vats security system

When you turn your key on before starting your engine, you should see the check engine light should come on. If this happens, your engine should start. This shows that your engine is ready to start. Air sensors and ecm are ready to go.

If you see SYS on your speedometer , you have some major ecm problems, and need professional help. SYS means a system problem.

If your engine will do a cold start, and not start after you drive a few miles. Then wait 5-20 minutes , and your engine will start again, you've given your ecm box time to cool off.

Might br the soider time to cool off and re set. This is frustration to have to wait until the engine ad ecm box time to cool down.

Good luck, hope you get your engine to start up and keep running.

How I lift up my hood when I stop, to allow my ecm box to cool off. The main problem, the ecm box gets hot, and cooks the electronic. Bad design. The new Corvette ecm boxes are located away from the hot engine.

Still trying to figure out how to put some cooling fins on my ecm box which GM started doing on their 95 Corvette models.

My opinion, GM knows that the ecm boxes fail due to heat.
Gene Corvette Man

San Francisco, CA

#15 Saturday Jan 23
Gene Corvette Man wrote:
<quoted text>
Had same problem, no start, ecm box rebuilt 3.times and still didn't work and no engine start. Desperate, found an on line ecm box, and hadn't installed, and enginevstartedvandvcar runs fine. Looks like my ecm box box just burned out since it's installed up in the engine bay. The box gets real hot, and GM has relocated ecm boxes out of the engine bay on newer model Vette's.
Hope these comments help owners with a similar no start problem.
1/23/2016, learned you should check your fuel pump, coil for spark, and make sure your engine is fully grounded in three places. Also, the oxi spark , like a distributor at bottom front of the engine can get water or moisture in it, and short out.
Are you sure your replacement ECM is a good one. I had my ecm rebuilt 3 times from Delco and they finally gave up and sent it back to me saying it was non repairable.
Good luck, hope you get your Corvette running soon.

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