please help

2005 FORD CROWN VICTORIA
73,000 MILES • V8 • FWD • AUTOMATIC
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NVMAN28
  • MEMBER
  • 1 POST
i have a 2005 ford crown victoria and when i start it up or stop and idel it surges****** and recently its gettin worse. on occasion when im drivin i will spell gas also. what might cause this?
Feb 19, 2011 at 7:50 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.
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BMRFIXIT
  • CAR REPAIR CONTRIBUTOR
  • 19,053 POSTS
if its spilling gas have to locate the area of the leak and fix as needed 1st
check for vacuum leaks too
Feb 20, 2011 at 12:15 AM
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03P71TAXI65
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  • 4 POSTS
Check the fuel rail pressure, should be around 40-60 psi. If the pressure is significantly lower, then replace the fuel filter. If that doesn't increase the pressure you may have a defective fuel pump. If the fuel rail pressure is okay, then I would check every sensor that adjusts the air/fuel ratio. Instead of wasting money replacing sensor after sensor, it might be wise to invest in a OBD II code reader, one that displays graphs. This tool allows you to monitor the sensors on the vehicle and see which ones aren't outputting in a certain range. I would guess either the MAF sensor or an Oxygen sensor.
Mar 17, 2011 at 8:09 AM