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1992 - Died after coolant flush, now won’t restart

jrclark32

Member
Joined
Mar 30, 2008
Messages
23
Location
Austin, TX
Corvette
1992 Coupe; 6-speed; Blue
I got my 1992 out yesterday and when I checked fluids, I noticed that the antifreeze looked pretty dirty. She hasn’t been getting hot, but I thought it was time for a system flush.

I pulled hoses, knock sensors, the thermostat, etc and did a thorough flush of the whole system. Then I put it back together, filled it up, bled the system, and was letting her run to get up to temperature when it just died.... like turning the key off.

I tried to restart, and it just cranks and cranks without even attempting to fire.

I pulled the codes and it’s showing 4. H16 on the speedo display.

I’d appreciate any advice you can offer.
 

jrclark32

Member
Joined
Mar 30, 2008
Messages
23
Location
Austin, TX
Corvette
1992 Coupe; 6-speed; Blue
I checked and there’s no spark. What could I have done that would cause ignition failure with no warning?
 

LLC5

Well-known member
Joined
Sep 28, 2004
Messages
2,299
Location
Wa.
Corvette
98 black 6spd convert.
If it's an opti spark system, coolant could have gotten onto the distributer behind the water pump.

Just a guess, I'm not real up to date on C4.
 

Robertwav1

Well-known member
Joined
Jan 7, 2003
Messages
813
Location
Ocala, Florida
Corvette
1993 Blue
Yes, I just did mine as well. You have to be real careful with any water near the engine. Keep the opti dry. I have a 93 and the bleed valves are in direct line with the Opti, you have to be careful and need to divert any antifreeze. It's a common problem.
 

jrclark32

Member
Joined
Mar 30, 2008
Messages
23
Location
Austin, TX
Corvette
1992 Coupe; 6-speed; Blue
Is there a procedure to troubleshoot that? The ICM and coil are both right there by that bleeder too. Is it possible one of those got screwed up?
 

Hib Halverson

Technical Writer for Internet & Print Media
Joined
Jan 10, 2001
Messages
13,453
Location
CenCoast CA
Corvette
71 04 12 19
First year for Opti-Spark was a bad one. During coolant changes or engine washes, if they get wet, that usually kills them.

You could try getting the distributor out, apart and cleaning and drying the inside but you're probably looking at replacement. The aftermarket MSD distributor is a good choice.
 

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