Just bought a 97 chevy 1500 that had engine
replaced. Was just having problem with error code 507, then started getting error 340 and truck started running rough. Notice battery terminals were dirty, so disconnected, cleaned and applied dielectric grease.
JA: Have you metered out the ignition system?
Customer: When started truck again, idle went and stayed at around 1,800. When checked codes again, got 507, 102, and P1351.
JA: What is the model of your '97 Chevy?
Customer: 1500 Z71 with 5.7 Liter
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Yes, would like to fix it, as I somehow did something disconnecting the battery.
JA: Anything else you think the mechanic should know?
Customer: Truck was running fine, just high idle for last 200 miles. High idle around 750 with a/c running. That is all