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1999 Ford F-150 Lariat 5.4L Poor Idle Quality, MIL Lamp on
Check engine light is on for bank 1 only running lean. Bank 2 is not indicated as too lean but LTFT is 19, LTFT on B1 is 25+. No vacuum leaks found. It seems only when vehicle engine cold the problem occurs. At warm idle, the STFT are always 0 +/- 3%. Odometer...
FIX posted 8/28/2013
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Message Closed w/FIX
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12 Replies Received
12 Replies Received
Related Documents & Media | VIN | 1FTRX18LXX |
| Engine | 5.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, MIL Lamp On |
| Occurs | Cold |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P1815 | TFP Valve Position Switch - Start In Wrong Range |
| U1262 | Data Circuit Malfunction |
Message Closed w/FIX
Vehicle Data
1999 Ford F-150 Lariat
| VIN | 1FTRX18LXX |
| Engine | 5.4 L / 8 cyl / GAS |
| Trans | 4-speed Automatic (Electronic) |
| Delivery | Fuel Injection |
| Emissions | OBD-II Compliant |
| Symptoms | Poor Idle Quality, MIL Lamp On |
| Occurs | Cold |
Trouble Codes
| P0171 | Fuel System Too Lean (Bank 1) |
| P1815 | TFP Valve Position Switch - Start In Wrong Range |
| U1262 | Data Circuit Malfunction |
Video