99 chevy 4.3 no spark

65

Asked by Oct 09, 2014 at 05:04 PM about the 1999 Chevrolet C/K 1500 LS 2WD

Question type: Maintenance & Repair

was stalling  than shut down all-together No Spark from coil, Code PO338c I replaced the
crank sensor still no spark...Checked the Exciter ring on crank its not loose. But it does
have input voltage at the coil

3 Answers

34,945

Voltage at the coil is good, the coil receives voltage from the computer and that charged the primary windings inside the coil creating a magnetic field around the primary and secondary windings. once the voltage is dropped from the coil the magnetic field is dropped which creates voltage inside the secondary windings which is discharged as a spark.Have you had your coil tested? Do you have an ohm meter?

65

yes i have a ohm meter . was trying to find a flow chart/ wiring diagram for this unit engine

34,945

Pull the coil and test resistance from the power to the ground where the computer plugs in and test resistance between the distributor lug and the metal frame around the coil.

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