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1988 Chevrolet C3500 Cheyenne 7.4L Excessive Emissions
This 454 goes into open loop, instantly, when throttle is released. Then mixture goes rich. OTC scan tool readings at idle are: IAC 15, INT 128, BLM 128, RPM 950, O2 .95V, TPS .64V, COOL 194, MAPV 1.07. If I open the throttle slightly (.012'), it goes into...
FIX posted 4/14/2000
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Message Closed w/FIX
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| VIN | 2GCHC39N8J |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | California |
| Symptoms | Excessive Emissions |
| Occurs | Always, Idle |
| Misc. | Dually |
Message Closed w/FIX
Vehicle Data
1988 Chevrolet C3500 Cheyenne
| VIN | 2GCHC39N8J |
| Engine | 7.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / TBI |
| Emissions | California |
| Symptoms | Excessive Emissions |
| Occurs | Always, Idle |
| Misc. | Dually |
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