1999 Mercury Grand Marquis GS 4.6L MIL Lamp on
Customer had no complaints other than CEL on. Ran codes and got the common 171-174 lean both banks. Did the MAF clean, check vacuum leaks, replace PCV,oem part. Checked for vacuum at crankcase with PCV plugged and no negative pressure. Cleared codes, test drov...
FIX posted 3/8/2010
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Vehicle Data1999 Mercury Grand Marquis GS
Trouble Codes
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Vehicle Data
1999 Mercury Grand Marquis GS
VIN | 2MEFM74W5X |
Engine | 4.6 L / 8 cyl / GAS |
Trans | 4-speed Automatic (Electronic) |
Delivery | FI |
Emissions | OBD-II Compliant |
Symptoms | MIL Lamp On |
Occurs | Intermittently |
Trouble Codes
P0171 | Fuel System Too Lean (Bank 1) |
P0174 | Fuel System Too Lean (Bank 2) |
P0300 | Multiple Misfire Detected |