Having problems with your 1998 GMC Jimmy ?

99 gmc jimmy won't 'spark' to start. It cranks but it just won't spark to start.

Posted / edited by AnonymousUser on : 26-10-2020

Answers :

Your problem will be in one or more of the power feeds to the ECM. This could be from a blown fuse,fusible link ,faulty ignition switch or poor connection in wire connector.

Attached is the wiring diagram for the ECM, I marked the three power feeds to ECM, you will need to test these with a test light or volt meter(suggested as you can see actual voltage reading). After finding which one has no or low voltage...trace it back the source and correct as needed.




Repair Help & Product Troubleshooting for 1998 GMC Jimmy

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