Opti-Spark Testing??
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
Opti-Spark Testing??
Are there any easy methods for testing the '94 Lt1 OPTI-SPARK. The
additions of a new FUEL PUMP & FUEL FILTER did little to solve my
problem. Will test injectors today. One thing that I did notice is that
when pressing SCHRADER VALVE to relieve pressure from system,
I didn't notice ANY gas spillage at all. NONE—ZERO. Anyway I am still
in need of plenty HELP from you all. MANY THANKS
additions of a new FUEL PUMP & FUEL FILTER did little to solve my
problem. Will test injectors today. One thing that I did notice is that
when pressing SCHRADER VALVE to relieve pressure from system,
I didn't notice ANY gas spillage at all. NONE—ZERO. Anyway I am still
in need of plenty HELP from you all. MANY THANKS
Friend Request Magnet
Joined: Dec 2005
Posts: 50,242
Likes: 149
From: ♫ ♪ ♫♫ ♪ ♫ ♪♪ ♫
Opti's do the strangest/different things when going bad.
Had a person driven my car they would of never known it had a bad opti on one day...but could tell on a different day.
Mine could be driven for a complete hour without acting up, it would idle perfect, drive ok as long as it wasnt romped on...then, with a changing of the gears it would run rough at times.
A person could take it out the very next day; let it get into closed loop, it would idle perfect, and get an occasional backfire or miss while driving.
My problems didnt happen until I was driving to get it dyno-tuned (of course
).I replaced the injectors first thinking that was the problem...it ran great the first time out...then the next day the opti showed its ugliness.
I got a GM opti NIB from Ebay for $99....replaced it, and its back to normal...
GL
Jim
Thread Starter
Burning Brakes
Joined: Aug 2004
Posts: 771
Likes: 0
From: Washington District of Columbia
That isnt quite accurate for every car that has an opti.
Opti's do the strangest/different things when going bad.
Had a person driven my car they would of never known it had a bad opti on one day...but could tell on a different day.
Mine could be driven for a complete hour without acting up, it would idle perfect, drive ok as long as it wasnt romped on...then, with a changing of the gears it would run rough at times.
A person could take it out the very next day; let it get into closed loop, it would idle perfect, and get an occasional backfire or miss while driving.
My problems didnt happen until I was driving to get it dyno-tuned (of course ).
I replaced the injectors first thinking that was the problem...it ran great the first time out...then the next day the opti showed its ugliness.
I got a GM opti NIB from Ebay for $99....replaced it, and its back to normal...
GL
Jim
Opti's do the strangest/different things when going bad.
Had a person driven my car they would of never known it had a bad opti on one day...but could tell on a different day.
Mine could be driven for a complete hour without acting up, it would idle perfect, drive ok as long as it wasnt romped on...then, with a changing of the gears it would run rough at times.
A person could take it out the very next day; let it get into closed loop, it would idle perfect, and get an occasional backfire or miss while driving.
My problems didnt happen until I was driving to get it dyno-tuned (of course
).I replaced the injectors first thinking that was the problem...it ran great the first time out...then the next day the opti showed its ugliness.
I got a GM opti NIB from Ebay for $99....replaced it, and its back to normal...
GL
Jim
Thanks for this reply. I haven't experienced any "back-firing" yet. You
can just tell the engines NOT running as it should. I can "get down" on
it in 1st, 2nd, third and maybe fourth gear. BUT NOT in 5th—definitely,
not in 6th—terrible shakes & car sounds like its about to fall a part. In
my last THREAD, before installing a new FUEL FILTER, when activating
the SCHRADER VALVE, there was NO spillage of gas, or any sounds of
a "hiss" at all. Nothing—Zero. THE GAS CAP WAS ALREADY OFF THOUGH. Any thoughts, anybody? P.S. I haven't REALLY drive my ride
in going on 2 weeks.
. I getting WITHDRAWAL symptoms 
.
Melting Slicks
Joined: Jul 2004
Posts: 2,695
Likes: 0
From: Chicago Illinois
Check the back side of plug wires that possibly would could be to close to header pipe or manifold. A wire could be fouling out on the pipe. Ask me how I know. The symtems you mention are the same I was having. Also some opti act up at high rpms. Hopefully thats not your issue.
Pro
Joined: Oct 2007
Posts: 739
Likes: 52
From: Reno NV
That isnt quite accurate for every car that has an opti.
Opti's do the strangest/different things when going bad.
Had a person driven my car they would of never known it had a bad opti on one day...but could tell on a different day.
Mine could be driven for a complete hour without acting up, it would idle perfect, drive ok as long as it wasnt romped on...then, with a changing of the gears it would run rough at times.
A person could take it out the very next day; let it get into closed loop, it would idle perfect, and get an occasional backfire or miss while driving.
My problems didnt happen until I was driving to get it dyno-tuned (of course ).
I replaced the injectors first thinking that was the problem...it ran great the first time out...then the next day the opti showed its ugliness.
I got a GM opti NIB from Ebay for $99....replaced it, and its back to normal...
GL
Jim
Opti's do the strangest/different things when going bad.
Had a person driven my car they would of never known it had a bad opti on one day...but could tell on a different day.
Mine could be driven for a complete hour without acting up, it would idle perfect, drive ok as long as it wasnt romped on...then, with a changing of the gears it would run rough at times.
A person could take it out the very next day; let it get into closed loop, it would idle perfect, and get an occasional backfire or miss while driving.
My problems didnt happen until I was driving to get it dyno-tuned (of course
).I replaced the injectors first thinking that was the problem...it ran great the first time out...then the next day the opti showed its ugliness.
I got a GM opti NIB from Ebay for $99....replaced it, and its back to normal...
GL
Jim
I bet his opti, water pump and wires are probably stock.
