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Ron
Ron, ASE Certified Technician
Category: Ford
Satisfied Customers: 23001
Experience:  23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
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Ford f 150 5.4 triton 3 valve 4x4: Getting reading p0203/p0171

Customer Question

Getting reading p0203/p0171 , replace fuel ejector no help ,, reading ejector open-cylinder /bank1-system too lean ?
Submitted: 1 year ago.
Category: Ford
Expert:  HDGENE replied 1 year ago.
Hello, you replaced the number 3 injector, third one back on the passenger side of the engine? Do you have injector pulse to the injector while checking with a noid lamp? Do you have the same codes stored after the injector replacement?
Customer: replied 1 year ago.
Yes I ck good pulses and yes we replace fuel ejector on passenger side
Expert:  HDGENE replied 1 year ago.
Same codes? Misfiring on same cylinder?
Customer: replied 1 year ago.
Yes
Customer: replied 1 year ago.
No
Expert:  HDGENE replied 1 year ago.
Ok so has same P0203 code and it is not misfiring on any cylinders now, just a check engine light on?
Customer: replied 1 year ago.
No it misfires and eat fuel , engine run ruff and engine light flashing
Expert:  HDGENE replied 1 year ago.
Ok well if the light is flashing its setting a code but you said no more P0203,So which cylinder is misfiring now, same one or different one(s)? how many miles on this engine and did you change the spark plugs ever?