GM Optispark — Faulty Ignition Timing - Low Res Signal

Scott Manager Claremont, California Posted   Edited  
Resource
Driveability
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L (P) 6-spd (S6-40/ML9)
Crank / No Start
Optispark
Low Resolution
Ckp
Cmp

This vehicle was towed in after the customer replace the Optispark distributor with a remanufactured unit. An in-cylinder pressure test was performed and compared to the low resolution, high resolution and secondary spark for #2 cylinder. As the image shows, the optispark unit is out of time.

Here is a capture of the repaired vehicle.

diag​.​net/file/f1pt8tavc…

diag​.​net/file/f28rn9cvc…

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