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

Test optispark wiring came up with an unusual reading?

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Old 07-07-2012, 06:41 PM
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Default Test optispark wiring came up with an unusual reading?

Hey guys as some of you might know I have been having a problem for a while here with my randomly shutting off. Well I through another optispark at it and well the problem got worse, it will not start at all now it only backfires out of the exhaust. Well l when testing the opti I got a rather interesting reading. The read are supposed to be
Optispark Harness
A = ~5vdc
B = ~5vdc
C = ~12vdc (or your system voltage)
D = ~0 - 0.2 ohms ground
Well for position D I got .865 ohms, what does this mean? And what should I be looking for?

edited 11/9/2011
Old 07-07-2012, 07:04 PM
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.865 ohms is not much and very close to the accepted reading. I would not consider it an issue. Some slight skew can be from your meter leads or where you selected your ground spot.
Old 07-07-2012, 07:05 PM
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Thanks shbox, not what I wanted to hear but thanks anyway.
Old 07-07-2012, 07:15 PM
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check the optispark again, i jsut got that had a the bearing missplaced about a half inch only reason i could think of it only backfiring out of the exhaust
Old 07-08-2012, 11:18 AM
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If it's backfiring it's a good sign there's spark. Check your spark plug wires again to see if you got them mixed up.
Old 07-08-2012, 01:03 PM
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Thanks, but its pretty hard to get the plug wires mixed up I am using the LTCC setup and the it is pretty much coil on plug.
Old 07-08-2012, 01:28 PM
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Something that would have been nice to know in the beginning of the thread...hahah.
Old 07-08-2012, 01:59 PM
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Originally Posted by starbucks
Thanks, but its pretty hard to get the plug wires mixed up I am using the LTCC setup and the it is pretty much coil on plug.
Oh, well then...
Old 07-08-2012, 04:06 PM
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Thanks for the help though, I'm going to take the opti off and verify that it is on correctly then I'm going to try get in contact with bob about testing my LTCC box, that is pretty much the only thing left.



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