I have a 93 Taurus 3.0, which has developed a problem that none of the local mechanics seem to be able to diagnose. It runs very well until it's been at operating temperature for a while. Then, when I stop at a light and take off, it won't accelerate past 5 miles an hour. Give it more gas and it bogs down and backfires. It also seems not to want to downshift, but since it's running so poorly, it's hard to tell. In neutral, it revs fine. After it cools down completely. It's fine again. I put it on the computer and got the following bad codes:
335 EGR feedback signal is/was out of range
171 Oxygen sensor not switching - system was at adaptive limits
172 Oxygen sensor not switching - system is or was lean
175 Oxygen sensor not switching - system was at adaptive limits
176 Oxygen sensor not switching - system is or was lean Left or Front HO2S
181 Fuel system was lean at part throttle Single, Right or Rear HO2S
186 Injector pulse width longer than expected or Mass Air Flow lower than expected
189 Fuel system was lean at part throttle - Left or Front HO2S
326 Pressure Feedback EGR shows low pressure
327 EGR feedback signal is/was low
542 Fuel pump open, bad ground or always on
634 Manual Lever Position (MLP) sensor out of range in PARK
I put in a new fuel pump, filter, and EGR, with no effect whatsoever. I can't test the vacuum, but one mechanic said it's fine.
Does anyone have any ideas on this one? As I say, no one around here seems to be able to figure it out.
Ken
335 EGR feedback signal is/was out of range
171 Oxygen sensor not switching - system was at adaptive limits
172 Oxygen sensor not switching - system is or was lean
175 Oxygen sensor not switching - system was at adaptive limits
176 Oxygen sensor not switching - system is or was lean Left or Front HO2S
181 Fuel system was lean at part throttle Single, Right or Rear HO2S
186 Injector pulse width longer than expected or Mass Air Flow lower than expected
189 Fuel system was lean at part throttle - Left or Front HO2S
326 Pressure Feedback EGR shows low pressure
327 EGR feedback signal is/was low
542 Fuel pump open, bad ground or always on
634 Manual Lever Position (MLP) sensor out of range in PARK
I put in a new fuel pump, filter, and EGR, with no effect whatsoever. I can't test the vacuum, but one mechanic said it's fine.
Does anyone have any ideas on this one? As I say, no one around here seems to be able to figure it out.
Ken