Mechanics

MOST COMMON CAUSE

1999 Mercury Station Wagon • 124,000 miles

Has set fault codes (p0174, p1151, p1131, p0171)stalls and run very bad when cold after driveing and car warmed up run fine doesnt stall
Avatar
Crash1961
January 5, 2012.



Electrical: Short to VPWR in the harness or HO2S
Water in the harness connector
Open/shorted HO2S circuit
Corrosion or poor mating terminals and wiring
Damaged HO2S
Damaged PCM

Fuel System: Excessive fuel pressure
Leaking/contaminated fuel injectors
Leaking fuel pressure regulator
Low fuel pressure or running out of fuel
Vapor recovery system
Induction System: Air leaks after the MAF
Vacuum Leaks

PCV system: Improperly seated engine oil dipstick
EGR System: Leaking gasket
Stuck EGR valve
Leaking diaphragm or EVR

Base Engine: Oil overfill
Cam Timing
Cylinder compression
Exhaust leaks before or near the HO2S(s)

Tiny
Fixitmr
Jan 5, 2012.