My Vette dies when it warms up. Help!
Thread Starter
Navigator
Joined: Apr 2010
Posts: 9
Likes: 0
My Vette dies when it warms up. Help!
I have a 95 with an LT-1. When it reaches around 180 degrees it dies an will not restert till it cools off. A quick check shows I'm not getting a spark. I replaced the Opti-Spark unit less than 10,000 miles ago and once this problem started i replaced the coil and ICM with no luck. I'm getting trouble codes H16 H77 H78 H34. Any help will be apperciated.
Last edited by hershell973; Apr 17, 2010 at 03:10 PM. Reason: typo
Advanced
Joined: Sep 2007
Posts: 70
Likes: 0
From: North West PA
I just completed an opti change, mine was throwing a code 16 and 36. Pretty much same symptoms, once it warmed up it just died and no restart till it cooled off. New opti is in along with electric water pump and she runs great. I noticed I wasn't getting the refrence signal to the ignition control module once it died and wouldn't restart, I can't remember which pin that is, I'll look in my book once I have another cup of coffee.
Melting Slicks
Joined: Nov 2005
Posts: 3,323
Likes: 142
From: Green Valley Arizona
Does the engine just die or does it do anything else prior to dieing?
My 95 had a heat problem....threw the OptiSpark codes. Changed it twice only to find out that it was the ECM.
Something you might try is to insulate the ECM with at thermal blanket, but only for troubleshooting...not driving. I also used a heat gun on the ECM and the engine stopped prior to the coolant temp getting hot.
Just things you might try.
My 95 had a heat problem....threw the OptiSpark codes. Changed it twice only to find out that it was the ECM.
Something you might try is to insulate the ECM with at thermal blanket, but only for troubleshooting...not driving. I also used a heat gun on the ECM and the engine stopped prior to the coolant temp getting hot.
Just things you might try.
Last edited by LannyL81; Apr 18, 2010 at 09:19 AM.
Thread Starter
Navigator
Joined: Apr 2010
Posts: 9
Likes: 0
when it dies it acts as if you turned the key off no missing or stumbling just stops and it doen't happen under any special circumstances it happens when I'm driving, idling in the driveway or at a stop light
Safety Car
Joined: Apr 2004
Posts: 4,532
Likes: 7
From: Lahaina Hi
The reluctor is bad in the distributor!
Advanced
Joined: Oct 2009
Posts: 67
Likes: 16
From: Lancaster, Pa
That code 16 means the opti is not sensing the low pulse and there is your problem. That little sensor inside is bad and acts up when it gets hot. I had something very similar with my '92 and my MSD opti was only 1000 miles old!!! MSD told me there was a bad sensor and it can be rebuilt for around $100. I had a bad opti from MSD. I bought a new opti since old one was out of warranty. I installed it last weekend and no more issues. I have driven several hundred miles since. I'm gonna keep the rebuilt one for my '93 when it gets sick. Good luck!
