Runs rough, backfires and poor gas mileage

1997 FORD THUNDERBIRD
98,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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CODY LEE
  • MEMBER
  • 3 POSTS
So I took the top O2 sensors out and clean them reinstalled then and nothing has changed. I still get the code of low voltage and heater low voltage as well as lean and rich O2 sensor malfunctions. my gas mileage is horrible and it runs very rough at a standstill and misfires at a steady speed throughout all miles per hour. what can I do?
Sep 25, 2019 at 8:42 PM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
Good morning,

There is no cleaning of the O2 sensors. They only sense the amount of Oxygen running across them.

What is the code that was sent? Let us start there.

Roy
Sep 25, 2019 at 9:05 PM
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CODY LEE
  • MEMBER
  • 3 POSTS
I am not exactly sure what the codes are now I do believe it was 01 3350 and o 1550 both on the first and second Bank and number one and two. so I had all 4 sensors the front two were low voltage and heater faults and and the back two had codes for lean a/f mixture (13)combined. one code for random cylinder misfire, and two codes for rich a/f mixture. Which it really has a potent exhaust out side of vehicle. Forgive me for I am not sure what the code numbers are , only what they had defined.
Sep 26, 2019 at 12:14 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
You should get a code reader or have a parts store read them for free.

Once I have the codes, I can help pinpoint the area of failure for you.

Roy
Sep 26, 2019 at 8:50 PM
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