I have a 1998 lincoln with 100K 4.6DOHC.( I figure this is the same engine as the cobras and might have a better respone here) I am getting severe hesitation /Jerking /Surge on light acceleration. I have replaced
fuel pump and all filters (old pump was running at 22 lbs)
MAF
TPS
Plugs
coils been rotated and checked using a new coil ( changed 1 at a time and test drove)
DPFE
Throttle bottle cleaned with new gasket / EGR as well ( will make a popping sound with vacuum applied)
cleaned injectors and rebuilt with new kit
New Pressure sensor / regulator
car has good gasmileage with no PIDS.
My STFT are between 4 and -4 for both banks
MY LTFT is now about 20 ( disconnected battery and reset)
If I should punch it out (WOT), the LTFT goes to 0 and my STFT goes to 20 so it basically reverses. Does this indicate a massive air leak? At idle, I am getting a steady reading of about 20 .
My I/M monitors shows the following system as INC ( 2 days after battery reset)
EGR , EVAP and CAT MON.INCOMPLETE Are these related to my issue?
car is still driveable but the hesitation sucks. ... Any Thoughts
Chuck
