TBI troubleshooting

[DieselSJ]

Sweet!!

I was chasing a high-idle issue on mine for a while. Found some obscure posting about the pickup in the distributor generating a weak signal. When I data-logged all looked good though. Replaced the dizzy and problem solved!

I know it was the pickup and not the ignition module because I ended up using my old module. Even though this was supposed to be a 'new Delco' brand dizzy, the ignition module didn't have any Delco or GM markings. Truck actually ran like crap with the new dizzy until I put my old genuine Delco module into it. But, high idle issue solved.