Insufficient spark

Asked by Feb 10, 2014 at 08:19 PM about the 1991 Chevrolet C/K 1500 Stepside 4WD

Question type: General

I been working in 91 1500 5.7 the truck doen not run ..I have spark from the coil to the dist.from the dist.to the wires is very insufficient spark till the point of no start...There is no much information about wiring diagram for the distribuitor..also I PULL the ECM check the connect #15pink wire go to the spark control module  a box is mounted top of the intake{left side}a have fuel pulse in the dist.but wont start... can I get some help about this problem...

1 Answer

116,305

If the spark at the coil is a brilliant blue spark and can jump around an inch then the coil is good if not then replace the coil, if the spark is good then check for the same spark at the spark plug end, it should also be a bright blue, if not replace the ignition wires along with the cap and rotor. Hope this helps.

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