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Slowly losing 5V reference signal
Can communicate with ECU with KOEO, loose communication when started. When it goes into closed loop it will stall. Monitoring 5V ref at sensors, I see it pulling down from 5V slowly towards 0 until it stalls. With KOEO disconnecting one sensor at a time it see... Login to read more. 
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| Engine | 5.7 L |
| Trans | 3-speed Automatic (Electronic) |
Vehicle Data
1988 GMC C3500 Sierra 5.7L
| Engine | 5.7 L |
| Trans | 3-speed Automatic (Electronic) |
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