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1991 Ford F-150 Custom 4.9L Surge, Cruise rpm miss
Customer brought truck to me with a miss at cruise speeds. It almost feels like a torque converter problem but theres no tcc. I tested fuel pressure and volume both are ok. It does not miss under load only at cruise rpm. I checked Map voltage, tps voltage ...
FIX posted 7/20/1999
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| VIN | 1FTEF14YSM |
| Engine | 4.9 L / 6 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / EFI |
| Symptoms | Surge, Cruise RPM Miss |
| Occurs | Cruise, While Cruising Down the Road |
Trouble Codes
| 179 | Adaptive fuel limit lean |
| 327 | Evp sensor below minimum |
| 328 | Evp below closed limit |
| 411 | cannot control RPM during koer test |
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Vehicle Data
1991 Ford F-150 Custom
| VIN | 1FTEF14YSM |
| Engine | 4.9 L / 6 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / EFI |
| Symptoms | Surge, Cruise RPM Miss |
| Occurs | Cruise, While Cruising Down the Road |
Trouble Codes
| 179 | Adaptive fuel limit lean |
| 327 | Evp sensor below minimum |
| 328 | Evp below closed limit |
| 411 | cannot control RPM during koer test |
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