Question about 2005 Mercury Grand Marquis
Short term fuel rail varies
Posted by Anonymous on
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Posted on Jan 02, 2017
It is likely the fuel pump is defective. It never produces the correct pressure based on the readings you presented here, it should be 42-44 PSI at idle and then when you throttle the engine it should go up to about 50 PSI, never down. To change the pump you must remove the gas tank from the car, this takes special tools (fuel line release tool) and a helper for sure. About 3 hours on the ground. This is a guess on my part and I caution you to have it checked out by the dealer before any parts are replaced.
Posted on Sep 13, 2012
Well ---PO 452 is still FTP Sensor Circuit Low Voltage Detected
new sensor or not
If the sensor reads less than .22volts with key on /engine off --you get a hard fault (code)
Check Sensor Connector
Sensor with no pressure or vacuum in tank is 2.4 to 2.8 volts
Key On/Eng Off On scan tool PIDS
You just need a shop with a data base & proper test procedure
or a different tech or different dealer.
I have the 2004 gas engine emissions diagnostic manual for all
2004 fords, as I have a Lincoln LS,so I don't know why a pro
Posted on Nov 25, 2012
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