GM Longroof Forum
Would you like to react to this message? Create an account in a few clicks or log in to continue.



 
HomeHome  PortalPortal  GalleryGallery  SearchSearch  RegisterRegister  Log in  

 

 OPTISPARK FAILURE!

Go down 
4 posters
AuthorMessage
roadsurfer



Posts : 46
Join date : 2011-02-27

OPTISPARK FAILURE! Empty
PostSubject: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 5:49 am

I have a 94 RMW 130K and have not posted here in quite some time. I had to replace the Optispark (not original)
because the plug port on the top had become compromised due to airborne oil residue getting down in there
after the plastic head of the plug had broken and it wasn't sealing well.

After a lot of research I bought an API unit from Sac City Corvette in California, with a 2 year warranty
for around $250(?).  Soon after installing it the engine would die when sitting at a traffic light in drive with
my foot on the brake. It was sporadic and only after the engine was warm. It would always fire right back up though,
and when driving, it was flawless. And if I increased the rpm while  my foot was on the brake just a little, or put it in neutral or park,
it wouldn't stall. Only in drive, at rest, when the rpm is lowest. This went on for a year and a half because
I was led to believe by a trusted mechanic that this sounded like a vacuum leak. I addressed every component
of the air intake except removing the intake manifold, which is original. Nothing changed.
Each time that the engine stalled the "service engine"  light came on but would go out after the car was shut
off  and restarted next time. I'm not a diagnostic mechanic. I am just good at taking things apart
and replacing or repairing if someone else tells me what is needed.

So finally, I got the idea to drive to a mechanic with an OBD1 scanner and wait there until it stalled for him
to read the code. Twice I did it and twice it said #26(?)...distributor. I ordered a replacement Opti since it was under warranty
and they were great about it and sent me a new one immediately after receiving the old one.
Put it on, and so far, it no longer stalls. (after one day.....but thats huge!)

I am posting this in hopes of helping other novices like me. Everyone said it didn't sound like an electrical
problem because it seemed related to RPM....turns out it was electrical.

I may not look here again right away at the forum, so if you ask me questions they may not get answered
right away. I just wanted to add to the pool of knowledge of the LT1/Opti issues. Thank you for being here, all
who make this forum happen.

Roadsurfer

Gainesville, Florida
Back to top Go down
Rev Bob



Posts : 386
Join date : 2016-05-24

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 5:55 am

Any time the Service Engine indicator lights, a code is stored. Even if the indicator goes out on the next ignition cycle. Reading codes should be the first step in troubleshooting problems.
Back to top Go down
Fred Kiehl

Fred Kiehl

Posts : 5985
Join date : 2009-11-13
Age : 72
Location : Largo, FL 33774

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 8:25 am

A friend of mine when through 4 optis before getting a good one.
Back to top Go down
roadsurfer



Posts : 46
Join date : 2011-02-27

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 8:42 am

I forgot to mention that I did have it scanned when the problem began and it was not storing any codes.
Back to top Go down
Rev Bob



Posts : 386
Join date : 2016-05-24

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 3:24 pm

"" and it was not storing any codes.""

After the Check Engine indicator lit?
Back to top Go down
goldwolfnhn



Posts : 228
Join date : 2019-07-11
Location : De Pere, Wisconsin

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 3:36 pm

sometimes a code is only in the computer as long as the problem is there, so once you shut down and start back up to code is gone.

This is why a lot of dealerships and repair shops will not diagnose an intermittent problem unless the CEL is on. Just had a car I took to a dealership for someone else that would intermittently go into limp mode, got to the dealer no problem dealer had it for 3 days but couldn't replicate the issue so no repair was done.
Back to top Go down
roadsurfer



Posts : 46
Join date : 2011-02-27

OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitimeFri Jun 18, 2021 7:49 pm

Okay, to be clear .....the engine would die at a traffic light.
The "service " light would come on. I would turn the key and start it right back up and keep driving.
Each time it happened (intermittently) I was in no position to go and find someone with an OBD1
scanner at that moment to check it out. After that trip was over and the car shut off, when I would start it up again, the service light was gone....until next time....etc.. and when I did have it checked without any service light on, it showed no code.
Since the problem never actually stranded me, it was easy to keep putting it off, until one day I decided to drive it to the mechanic and sit in his driveway with the motor in drive and wait for it to stall and then check it right then with the service light on. each time it read opt problem.
But it also seemed to vary in rpm while sitting still in drive, sort of rpm surge a little sometimes, as if I tapped the gas. Everyone said "vacuum problem" by the symptoms. And since removing and sending in the optic was a project, I explored external air supply for leaks until all was exhausted and I removed the optic and got a new one...and no more problem.
I didn't give enough details in my original account of the problem here. Sorry. You guys are on top of it!
Back to top Go down
Sponsored content




OPTISPARK FAILURE! Empty
PostSubject: Re: OPTISPARK FAILURE!   OPTISPARK FAILURE! Icon_minitime

Back to top Go down
 
OPTISPARK FAILURE!
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
GM Longroof Forum :: Longroof Tech :: Engine-
Jump to: