LT1-LT4 Modifications 1993-97 Gen II Small Block V8

having problems with brand new msd opti

Thread Tools
 
Search this Thread
 
Old Jun 22, 2010 | 10:57 AM
  #1  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default having problems with brand new msd opti

had been on the car 2 days then went to the track. as soon as i run, this starts happening:

when im at wot and about 6k, it misses so bad the tach wont move. its been very on and off. under any other circumstance, it runs great. i called msd and they said if its not throwing a code for high ir low resolution, its not the opti.

any thoughts?
Reply
Old Jun 22, 2010 | 11:16 AM
  #2  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default

i also put silicon around where the wires go into the opti and a thin bead around the cap to seal it to the base
Reply
Old Jun 22, 2010 | 11:26 AM
  #3  
93FireBirD's Avatar
Teching In
 
Joined: Jun 2010
Posts: 20
Likes: 0
From: Chicago
Default

hows the coil? Are you sure its not something else?
Reply
Old Jun 22, 2010 | 11:34 AM
  #4  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default

idk thats why im posting a thread. i kinda thought the timing may have been off when they made it so i asked msd how to set it back to factory settings. havent driven it since that yet. was kinda thinkin coil. its an msd blaster, been on there for
a year or 2, i guess. it does seem to get worse when its been running for a while
Reply
Old Jun 23, 2010 | 08:21 AM
  #5  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default

anyone else?
Reply
Old Jun 23, 2010 | 09:25 AM
  #6  
defaultexistence's Avatar
TECH Fanatic
iTrader: (11)
 
Joined: Sep 2005
Posts: 1,954
Likes: 1
From: fort walton beach,fl
Default

check coil , check icm at your local parts store replace if needed, say fuckit and go efi24x
Reply
Old Jun 23, 2010 | 09:40 AM
  #7  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default

icm is new but i got a spare so i guess ill swap it. i wish i could use the efi system. kinda broke at the moment tho. plus i have a double roller so idk how thats gonna work
Reply
Old Jun 23, 2010 | 11:56 AM
  #8  
brettmc's Avatar
Banned
 
Joined: Sep 2009
Posts: 213
Likes: 1
From: st louis, mo area
Default

my coil and icm passed the tests on shbox's website but I replaced both anyway and that fixed my no-run problem.
Reply
LS1 Tech Stories

The Best V8 Stories One Small Block at Time

story-0

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

 Verdad Gallardo
story-1

6 Common C5 Corvette Failures and What's Involved In Repairing Them

 Pouria Savadkouei
story-2

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

 Verdad Gallardo
story-3

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

 Pouria Savadkouei
story-4

Top 10 Most Powerful Chevy Trucks Ever Made!

 
story-5

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

 Verdad Gallardo
story-6

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

 Verdad Gallardo
story-7

Awesome K5 Blazer Restomod Comes With C7 Corvette Power

 Verdad Gallardo
story-8

10 Camaros You Should Never Buy

 
story-9

10 LS Engine Myths That Refuse to Die

 Verdad Gallardo
Old Jun 23, 2010 | 01:36 PM
  #9  
BALLSS's Avatar
TECH Veteran
15 Year Member
Liked
Loved
Community Favorite
 
Joined: Apr 2008
Posts: 4,985
Likes: 112
Default

Originally Posted by ElkySS
had been on the car 2 days then went to the track. as soon as i run, this starts happening:

when im at wot and about 6k, it misses so bad the tach wont move. its been very on and off. under any other circumstance, it runs great. i called msd and they said if its not throwing a code for high ir low resolution, its not the opti.

any thoughts?
assumeing your issue is not valve float....my MSD did crap at high RPM's also. MSD replaced it and I sold it. My original OEM opti solved the problem and is still on the 383
Reply
Old Jun 23, 2010 | 02:24 PM
  #10  
94Z28rag's Avatar
TECH Fanatic
iTrader: (10)
 
Joined: Jun 2008
Posts: 1,217
Likes: 1
From: West Chester, PA
Default

I stayed away from the MSD optis because of hundreds of stories like this. Cut your losses and get a new GM opti from Summit.
Reply
Old Jun 23, 2010 | 03:52 PM
  #11  
MasterTomos's Avatar
TECH Junkie
15 Year Member
Photogenic
Photoriffic
Shutterbug
iTrader: (15)
 
Joined: Oct 2008
Posts: 3,509
Likes: 4
From: Midwest
Default

Originally Posted by 94Z28rag
I stayed away from the MSD optis because of hundreds of stories like this.
Funny there was a thread on here not too long ago and I got ripped on by one or two people for saying this...
Reply
Old Jun 23, 2010 | 04:42 PM
  #12  
mark97ta's Avatar
Staging Lane
iTrader: (1)
 
Joined: Jun 2009
Posts: 79
Likes: 0
From: swansboro NC
Default

i am not familiar with these opti's but don't they have a timing adjustment... have you tired to play with that and see if it changes... could also be valve float... what plugs and their gap ?
Reply
Old Jun 23, 2010 | 04:58 PM
  #13  
ElkySS's Avatar
Thread Starter
11 Second Club
iTrader: (6)
 
Joined: Oct 2007
Posts: 2,149
Likes: 31
From: Houston Tx
Default

update: looks like i fixed the problem. i replaced the icm and reapplied the di electric grease. drove home wot the whole way, didnt miss once and ran real strong. wont no for sure till i drive it for a little while but this is the longest its gone without missing since the opti went on. if it does it again, im warrantying the msd and getting a delco. (which i have had)
Reply
Old Jun 23, 2010 | 10:14 PM
  #14  
robsquikz28's Avatar
TECH Veteran
iTrader: (246)
 
Joined: Mar 2008
Posts: 4,984
Likes: 1
From: Chicago/Crown point
Default

update....
Reply




All times are GMT -5. The time now is 07:00 PM.

story-0
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Slideshow: This heavily modified 1971 Camaro mixes classic muscle car styling with a fifth-generation Camaro interior and modern LS3 power.

By Verdad Gallardo | 2026-05-12 18:06:42


VIEW MORE
story-1
6 Common C5 Corvette Failures and What's Involved In Repairing Them

Slideshow: From wobbling harmonic balancers to failed EBCMs, these are the issues that define long-term C5 ownership and what repairs typically involve.

By Pouria Savadkouei | 2026-05-07 18:44:57


VIEW MORE
story-2
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Slideshow: A modern Camaro transformed into a retro icon, this limited-run "Bandit" build blends nostalgia with brute force in a way few revivals manage.

By Verdad Gallardo | 2026-04-21 13:57:02


VIEW MORE
story-3
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Slideshow: Cadillac didn't just crash the high-performance luxury vehicle party, it showed up loud, supercharged, and occasionally a little unhinged...

By Pouria Savadkouei | 2026-04-16 10:05:15


VIEW MORE
story-4
Top 10 Most Powerful Chevy Trucks Ever Made!

Slideshow: Top ten most powerful Chevy trucks ever made

By | 2026-03-25 09:22:26


VIEW MORE
story-5
Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Slideshow: Hennessey has turned the Silverado ZR2 into a 700-hp off-road monster with supercharged V8 power and a limited production run.

By Verdad Gallardo | 2026-03-24 18:57:52


VIEW MORE
story-6
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Slideshow: A one-off sports car that looks like a vintage Italian exotic-but hides a C6 Corvette underneath-just sold for the price of a new mid-engine Corvette.

By Verdad Gallardo | 2026-03-23 18:53:41


VIEW MORE
story-7
Awesome K5 Blazer Restomod Comes With C7 Corvette Power

Slideshow: A heavily reworked 1972 K5 Blazer swaps its off-road roots for a low-slung street-focused build with modern V8 power.

By Verdad Gallardo | 2026-03-09 18:08:45


VIEW MORE
story-8
10 Camaros You Should Never Buy

Slideshow: There are thousands of used Camaros on the market but we think you should avoid these 10

By | 2026-02-17 17:09:30


VIEW MORE
story-9
10 LS Engine Myths That Refuse to Die

Slideshows: Which one of these myths do you believe?

By Verdad Gallardo | 2026-01-28 18:10:11


VIEW MORE