Help please!
Thread Starter
3rd Gear
Joined: Jul 2024
Posts: 3
Likes: 0
Help please!
Hi all,
while driving my 96 lt4 at 5800rpm the car just bogged and died. I could not start it after that and had it towed home. It will not fire even with starting fluid and it appears I am getting spark and I believe I am getting fuel. I have checked icm everything appears to be firing ok. If it is the optispark why is it still firing? Also could it possibly be fuel related although it will not fire on ether?
thanks all just bought the car and broken down already!
while driving my 96 lt4 at 5800rpm the car just bogged and died. I could not start it after that and had it towed home. It will not fire even with starting fluid and it appears I am getting spark and I believe I am getting fuel. I have checked icm everything appears to be firing ok. If it is the optispark why is it still firing? Also could it possibly be fuel related although it will not fire on ether?
thanks all just bought the car and broken down already!
Safety Car
Joined: Apr 2016
Posts: 4,648
Likes: 1,059
From: N.E. Ohio OH
Finalist 2020 C4 of the Year - Modified
it appears I am getting spark
Racer
Joined: May 2007
Posts: 305
Likes: 49
From: Florida
5800 rpms? Man you were getting on it. So it bogged down and stoped... ok im assuming the engine turns over and uncle Rodney has not made an apearance, then compression should be fine. What is the fuel pressure at the rail? If you have good fuel pressure, and you say you have confirmed spark on both banks, then it would seem the timing is the issue. Perhaps the internals of the optispark have become out of time somehow? IDK anything about the optispark yet, but that would seem to be the problem here.
Thread Starter
3rd Gear
Joined: Jul 2024
Posts: 3
Likes: 0
Excellent post and I, unfortunately think you might be correct. It may have lost gears and is sparking at the wrong time in the cycle. I was just praying it was something like VATS error or fuel injectors but it won’t fire on starting fluid either so I think you could be correct.
Burning Brakes
Joined: Jun 2022
Posts: 844
Likes: 212
From: Florida
Excellent post and I, unfortunately think you might be correct. It may have lost gears and is sparking at the wrong time in the cycle. I was just praying it was something like VATS error or fuel injectors but it won’t fire on starting fluid either so I think you could be correct.
The later model Opti, which you have, is built with a robust coupling to the gears behind the timing chain. I doubt you broke that. I doubt you skipped a tooth.
Check the fuel just in case. If you have pressure, most likely, you can eliminate that as a cause.
The fact you couldn't get it running with starting fluid, even though you have spark, tells me you may have an issue with the Opti or the ECM. Something either quit sending signals (Opti) or quit commanding certain functions (ECM).
