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1998 Chevrolet Corvette 5.7L No Start, Broken gears in T/B
What a mess! I'm retired but am helping a guy out with an LS1+ 6 speed swap into an old car. on first start attempt, it immediately set the three codes and will not fire. I believe PCM is preventing start because it can not control throttle. I used my DSO ...
FIX posted 5/22/2026
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Message Closed w/FIX
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7 Replies Received
7 Replies Received
Related Documents & Media | VIN | [No VIN Available] |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 6-speed Automatic |
| Delivery | Fuel Injection / SEFI |
| Emissions | Not OBD-II Compliant |
| Symptoms | No Start, Broken Gears in T/B |
| Occurs | Always |
| Misc. | Ls1 Engine Swap/ 6 Sp. Manual |
Trouble Codes
| P1120 | TP Sensor 1 Circuit Malfunction |
| P1220 | TP Sensor 2 Circuit Malfunction |
| P1516 | Control Module Throttle Actuator Position Performance |
Message Closed w/FIX
Vehicle Data
1998 Chevrolet Corvette
| VIN | [No VIN Available] |
| Engine | 5.7 L / 8 cyl / GAS |
| Trans | 6-speed Automatic |
| Delivery | Fuel Injection / SEFI |
| Emissions | Not OBD-II Compliant |
| Symptoms | No Start, Broken Gears in T/B |
| Occurs | Always |
| Misc. | Ls1 Engine Swap/ 6 Sp. Manual |
Trouble Codes
| P1120 | TP Sensor 1 Circuit Malfunction |
| P1220 | TP Sensor 2 Circuit Malfunction |
| P1516 | Control Module Throttle Actuator Position Performance |
Video