Opti or PCM - way to determine?

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08-13-2012, 06:27 PM

Z28Roxy

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Opti or PCM - way to determine?

Is there a way to determine if the opti or PCM is causing a no start condition? I'm not getting spark or pulsing ground at the injectors (no spark no fuel).

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08-13-2012, 08:58 PM

DisasterFormula

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http://shbox.com/1/4th_gen_tech2.html#opti_test

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08-13-2012, 09:36 PM

Z28Roxy

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Quote:

Originally Posted by DisasterFormula

http://shbox.com/1/4th_gen_tech2.html#opti_test

All of those are showing the correct voltages, does that mean my opti is bad then?

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08-13-2012, 10:45 PM

shbox

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You are getting 1-4v ac to the ICM and therefore spark, but no injector pulse action? Have you checked the power to the injectors?

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08-13-2012, 11:50 PM

Z28Roxy

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Quote:

Originally Posted by shbox

You are getting 1-4v ac to the ICM and therefore spark, but no injector pulse action? Have you checked the power to the injectors?

I put my timing light on some plug wires and it doesn't light up (no spark? I suppose I could also use a spark plug and spark plug wire and see what happens in the dark).

And no, I'll check that next on the injectors.

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