Dreaded Optispark
Thread Starter
Racer
Joined: Jul 2006
Posts: 306
Likes: 1
From: StLouis, 93 Vert LT1
Dreaded Optispark
My 93 wont start! Checked fuel press (held 39 lbs for over 10 mins.), ohmed fuel injectors(13+all), Changed fuel filter, even syphoned gas and replaced with fresh, getting spark at all cylinders, will not fire even with either sprayed into air intake. Ive ruled out a fuel problem. My question is..........If the optispark goes bad, Would I still be getting spark at all cylinders and shouldint it at least start? I know it can effect performance but I figure it should at least start. Also could a bad Opti effect timing at all?
Team Owner
Joined: Aug 2000
Posts: 40,156
Likes: 45
From: San Pedro CA
check, at the very least, the coil wire.
you really need the Factory Service Manual to properly debug this problem. www.helminc.com.
you really need the Factory Service Manual to properly debug this problem. www.helminc.com.
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Originally Posted by bogus
check, at the very least, the coil wire.
you really need the Factory Service Manual to properly debug this problem. www.helminc.com.
you really need the Factory Service Manual to properly debug this problem. www.helminc.com.
see my reply to your other post.Just remember, the "dreaded" opti is a distributor like any other and will suffer the same things a normal one will, just somethings more than others.
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
First thing you absolutely need to do first is dump your error codes. This will set you on the right path to diagnosis. This is easy to do yourself, or take to Autozone for free error check.
Yes the Opti can screw up timing if the optical sensor or shutter wheel are defective. Is your Opti original? How many plugs did you test for spark?
How fast did your fuel pressure drop after 10 minutes? It should hold for many hours, and only drop very very slowly.
Also, is eyther the same as starting fluid(ie Is it highly combustable)?
Yes the Opti can screw up timing if the optical sensor or shutter wheel are defective. Is your Opti original? How many plugs did you test for spark?
How fast did your fuel pressure drop after 10 minutes? It should hold for many hours, and only drop very very slowly.
Also, is eyther the same as starting fluid(ie Is it highly combustable)?
Last edited by MikeC4; Jul 3, 2006 at 11:41 PM.
Thread Starter
Racer
Joined: Jul 2006
Posts: 306
Likes: 1
From: StLouis, 93 Vert LT1
