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1991 Ford Explorer XL 4.0L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp on
Symptoms came on suddenly. hard start , flooding , poor
mileage , black plugs , rough running , rough idle. Did a
fuel pressure test,good,(bleeds down quickly though),
checked regulator for leaking fuel, couldn't find a map
senser to check. Vac 18.5in.
FIX posted 12/14/2000
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Related Documents & Media 
| VIN | 1FMDU34X7M |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / MULTIPORT/DIS |
| Emissions | FED |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 41 | ego h02s not switching rich / lean |
| 42 | ego indicates system always rich |
Message Closed w/FIX
Vehicle Data
1991 Ford Explorer XL
| VIN | 1FMDU34X7M |
| Engine | 4.0 L / 6 cyl / GAS |
| Trans | 5-speed Standard |
| Delivery | FI / MULTIPORT/DIS |
| Emissions | FED |
| Symptoms | Excessive Emissions, Poor Idle Quality, Poor Fuel Economy, MIL Lamp On |
| Occurs | Always |
Trouble Codes
| 41 | ego h02s not switching rich / lean |
| 42 | ego indicates system always rich |
Video