Question about 2005 Mercury Grand Marquis

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Pulsating idle; scanner shows no codes-check engine light never came on.

Short term fuel rail varies

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: I have an engine miss,****,buck at about 45 mph

Change plug wires next and put in some SeaFoam. This sounds like a tune up issue... just run though the paces.

Posted on Jul 29, 2010

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emissionwiz
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SOURCE: 2000 Mercury Sable double overhead cam/car starts 7has 35psi fuel pressure/pressure drops to under 20 psi & motor stops running. What would cause the fuel pump to shut down? Runs & maintains

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

SOURCE: have 04 mercury grand marquis check engine light is on for code po452 had that fixed and light still on

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
couldn't resolve

Posted on Nov 25, 2012

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1 Answer

Engine Code P0171 Logged


If Short term # is high while underway, but normal while idling, you could have a scewed maf signal. Sometimes cleaning maf with carb cleaner helps. If no intake leaks are found, and fuel pressure and volume are ok, it could be maf sensor.

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Recently purchased. MIL light on - Scan tool Shows code P0171 $07E8 Monitor / GenericLean Trim.


First of all, what kind of car is this? Second, this is a lean code. Now, if you really have no intake leaks or restricted fuel issues, one possibility is scewed maf signal during higher rpms. If you can, monitor your Short Term fuel trim at normal highway speeds.If it is high, then and lower at idle, you may need a maf sensor.
Hope this helps

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The service engine light comes on with a code P0193 "Fuel Pressure High". The fuel pressure per the monitor is 39.6 PSI (273 KPA) and the bank 2 Long Term Fuel is 4.3 compared to 1.6 for bank 1....


this vehicle has a fuel pressure sensor on the fuel rail. the sensor has a tendency to glich out on the voltage signal from time to time thus making the check engine light come on. does your scan tool have freeze frame data? if so see if the fuel pressure was high when the code set. if the pressure reads over 100 psi then the sensor is going bad.as for the fuel trim data, not an uncommon split from right and left banks if this reading is at idle. -7.0 to + 7.0 is accecptable long term fuel trim as long as both banks read rather close to one another.

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2002 Ford Mustang GT I used OBD-II to get the trouble codes, I got P0174,P0301,P302,P316 Freeze Frame Information: 1. DTC for which Freeze Frame was Stored - P0174 2. Fuel System 1 Status - Closed...


Because you got a misfire on cylinder #1 PO301
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Etc,Etc


The LTT, is the result of not learning (yet-thus long term)
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Replace bad Coil--which ever is missing
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Check engine light comes on temporarily - engine chuggs at idle


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Service engine light on showing code p0089


Diagnostic trouble code P0089 - The ECM commands the Bosch high-pressure fuel pump to deliver a specific fuel rail pressure - that can vary up to 23,000 psi depending on load and speed. The actual pressure is monitored via the fuel rail pressure sensor. If the fuel rail pressure varies more than desired or if commanded fuel pump flow is 100mm3/second or less, DTC P0089 will set.

Corrective action includes measuring the fuel rail pressure using a Tech II scan tool, then compare that to commanded fuel rail pressure with the engine running at 2000 rpm. The difference must be less than 20 Mpa.

A blockage in the fuel tank or plugged fuel filter could cause this fault (excessive vacuum in fuel line). If there is less than 5 in Hg of vacuum when measured at the fuel pressure test port at 3000 rpm, the fuel pressure regulator could be defective, and may need to be replaced. The fuel pressure regulator (FPR) is a sub assembly located on the Bosch high-pressure fuel pump.

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1 Answer

Ser.eng.soon flashes code 34 MAP sensor


A code 34 calls attention to the MAF sensor, not a MAP sensor. Try changing that out, first. You might also be having problems with your ignition control module.

Jul 20, 2008 | 1988 Oldsmobile Cutlass Ciera

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