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1994 Mazda B4000 SE 4.0L Misfire, MIL Lamp on
This 4.0L Mazda, (same as a Ranger), turns on the MIL and starts missing only after a 4 to 5hr highway cruise. This problem never shows up in city driving,(no codes after 6 weeks of city driving).I cleaned the MAF and on the lab scope looked OK. HO2 sensor...
FIX posted 8/2/1999
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Related Documents & Media 
| VIN | 4F4DR17X9R |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / EFI |
| Emissions | Not OBD-II Compliant |
| Symptoms | Misfire, MIL Lamp On |
| Occurs | Cruise, Intermittently |
| Misc. | 4X4 Super Cab |
Trouble Codes
| 172 | Lean bank 1 |
| 173 | Rich bank 1 |
| 176 | Lean bank 2 |
| 177 | Rich bank 2 |
| 542 | fuel pump secondary |
| 556 | fuel pump primary |
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Vehicle Data
1994 Mazda B4000 SE
| VIN | 4F4DR17X9R |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 4-speed Automatic |
| Delivery | FI / EFI |
| Emissions | Not OBD-II Compliant |
| Symptoms | Misfire, MIL Lamp On |
| Occurs | Cruise, Intermittently |
| Misc. | 4X4 Super Cab |
Trouble Codes
| 172 | Lean bank 1 |
| 173 | Rich bank 1 |
| 176 | Lean bank 2 |
| 177 | Rich bank 2 |
| 542 | fuel pump secondary |
| 556 | fuel pump primary |
Video