4.6L is Bogging when stepping gas pedal when in park not as bad when in gear with foot on brake. We replaced the passenger side Cat and pulled the O2 Sensor out front of the Cat problem didn't go away so it is not the other Cat. Notice a bad smell when the Car starting acting up. Was told it could be the map sensor. Also has a lot of condensation coming out of the exhaust pipe. We know these engines have problems with the intake manifold gaskets ect... The Car has 127K has been a great Car.
Nothing like guessing! There can only be 2 sources of issues. Lack of fuel, lack of air flow. Check fuel pressure and flow, check EGR and IAC.
SOURCE: 2003 Mercury Mountaineer with 4.6L is loosing
dont know of any head gasket concerns, usually when the intake manifold leaks it either split and pours out or the heater hose fittings crack and leak. Check the hose connections at the intake and make sure none of the hose clamps have cracked and are leaking
SOURCE: Temperature sensor 2000 Mecury Grand Marquis
Make sure that is the sensor. That should be your oil pressure sensor. Follow the top radiator hose to the thermostat look closest to that for the wire going to the sensor. This should be the temp sensor. Good luck
SOURCE: Heater hose connecter pulls out of intake manifold
Try cleaning the tube and manifold where they connect (use small wire brush or?). I would try using JB Weld @ the fitting before i would even consider a new intake. Water pressure in the cooling system shouldn't be much over 15-18 lbs. so doing this quick fix should solve the problem.
SOURCE: P1401 still after replacing EGR pressure and EGR valve
Yes that is what is wrong the intake manifold is plugged with carbon restricting EGR flow you need to clean out the ports to correct the problem if you run the car to long you will burn the DPFE ( the EGR pressure sensor ) out agian
SOURCE: 05 Mercury Montego Throttle control/sensor
Try a salvage yard for the part. As soon as your new car left the lot it became a used car. Used cars run on used parts.
If the old part is a recall they will upgrade you regardless which part is on your car.
Check the internet and enter your part# in the search box of the Browser. You may get lucky for a new part.
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Transmission input speed (Turbine)
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Transmission output speed
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Vehicle speed (miles/hour)
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A/B/C Range
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PRNDL select
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Desired PCS
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Actual PCS
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PCS duty cycle
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Brake switch
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Engine coolant temperature (Coolant)
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Transmission fluid temperature (Trans Temp)
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Throttle angle (TPS)
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System volts
Step
Action
Value(s)
Yes
No
1
Perform the Transmission Fluid Check .
Is the fluid level correct?
--
Go to Step 2
--
2
Check for PCM trouble codes, both current and history.
Are PCM trouble codes present?
--
Go to Diagnostic Trouble Code Identification
Go to Step 3
3
Was the condition duplicated?
--
Go to Step 4
Go to Step 12
4
Is a harsh or soft shift condition present
--
Go to Step 7
Go to Step 5
5
Is the vehicle's performance poor?
--
Go to Torque Converter Evaluation section of Torque Converter Clutch Diagnosis
Go to Step 6
6
Is the engagement into Drive or Reverse delayed or missing?
--
Go to Step 7
Go to Step 9
7
Perform the Line Pressure Check .
Is the line pressure correct?
--
Go to Step 8
Refer to Symptom Diagnosis Charts
8
Inspect the transmission wire harness connectors and the transmission range switch.
Was the problem found and corrected?
--
System OK
Refer to Symptom Diagnosis Charts
9
Is vibration or noise a problem?
--
Refer to Vibration Test Procedure of Torque Converter Clutch Diagnosis
Go to Step 10
10
Is the fluid leaking?
--
Refer to Fluid Leak Diagnosis and Repair
Go to Step 11
11
Are other transmission conditions present?
--
Refer to Symptom Diagnosis Charts
Go to Step 12
12
The condition is intermittent.
Re-examine the complaint.
--
Exit Table
--
No Engine Braking; Manual First - First Gear
No Engine Braking; Manual First -- First Gear
Causes
Coast Clutch
No apply (Refer to No Engine Braking; All Manual Ranges )
Lo and Reverse Servo
No apply (Refer to No Reverse or Slips in Reverse )
Pressure Switch Assembly (13)
Leaking or inoperative
#1 Checkball
Missing
Parameters that are marked with an (*) asterist are also valid in the Engine 2 list.
Checks
Tech 1 Data Value Examples
Table 1:
Engine 1
Table 2:
Engine 2
If you have completed the On-Board Diagnostic (OBD) system check, if the diagnostics are functioning properly and if no DTCs display, you may use the Typical Scan Values in the table below for comparison within the appropriate transmission. These typical values are an average of display values recorded from normally operating vehicles. They represent the display from a normally functioning system.
You should never use a scan tool that displays faulty data. The problem should be reported to the manufacturer. The use of a faulty scan tool can result in misdiagnosis and the unnecessary replacement of parts.
Only the parameters listed below are used in this manual for diagnosing. If a scan tool displays other parameters, the values are not recommended by General Motors for use in diagnosis.
Scan tests are performed under the following driving conditions:
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Idle
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Upper radiator hose is hot
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Closed throttle
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Park or Neutral
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Closed Loop
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Accelerator OFF
?€¢
Brake not applied
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Usually answered in minutes!
We also needed to add our Grand Marquis was drinking a little Antifreeze no check engine lights 1/2 gallon per a month. Ty.
Furthermore; had some what apprears to be steam and water dripping out of the exhaust.
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