Question about 1990 GMC S-15 Jimmy
I would check for a spark leak through the coil wire to the dipstick as it happens comonly. If thats not the problem check the PU coil and module. There are some parts stores that can check the module as there is no self diagnostic for it. The Pick Up coil can be checked with an ohm meeter or mv test if you crank it over while testing it should produce a mv oscilating from positive to negative.
Posted on Nov 16, 2009
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Posted on Jan 02, 2017
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