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2000 Mercury Mountaineer 5.0L dumping gas into intake manifold and detonation in exhaust manifold on exhaust firing cycle
Error Codes: 1131, 1137, 1151, 1157
Replaced FOUR O2 Sensors, MAF Sensor, EGR Valve, EGR Solenoid, EGR DP Sensor, IAC Valve.
Checked for Vacuum Leaks: NO leaks.
Cleaned new MAF Sensor with CRC MAF Sensor cleaner and let dry completely.
Disconnect Negative Battery cable and let sit for an hour. Runs rough on start until ECM resets mixture to Factory. Runs and drives good for 14 miles. Then, Smell gas, runs rough, no power, LOUD, Stalls.
Re: 2000 Mercury Mountaineer 5.0L dumping gas into intake...
Fuel pressure regulator bad. Vacuum operated , pull the vacuum line. Smells like fuel. It's bad .Electronic could a fuel pressure sensor on the fuel rail or the fuel pump control module.
Testimonial: "It has a new sending unit in the tank in March of this year (Electronic)and 65 psi on the rail."
Is this when you turn on the key or running? 65 is kind of high for key on. Way high for running. Goes back to the pressure regulator.Is this when you turn on the key or running? 65 is kind of high for key on. Way high for running. Goes back to the pressure regulator.
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Hi Mark:
My train of thought is along the line that for unburned fuel to get into the exhaust manifold, it still has to go through a cylinder so there is either no spark to light it up, or it's so rich that it's not burning. Have you had a chance to check the plug tips for indicators as to what's happening in the combustion chamber?
Just an Old Dude thinking out loud and typing it down...
this is a complicated question there are many steps to removing the intake its best to get a hanes book on your mountaineer and it will tell you step by step on how to remove and replace the intake you can watch videos on youtube to give you even more info about the job before you start really do the research first
those codes are for a misfire if you've already replaced the plugs and wires and it still throws the same codes check the coil for those 2 cylinders and make sure it's firing if it is check to make sure the fuel injectors are firing on those 2 cylinders a leaking intake wouldn't cause the misfire codes it would throw like a po171 and or a po174 normally
If you have the check engine light on, rent a scanner, read out the code(s), and pursue to repairs. Possible problems are: idle air valve, vacuum leak (hoses and loose bolts) on intake manifold, EGR valve defective or not properly controlled, PCV valve defective, sticky injectors, bad plugs/wiring, O2 sensor, ect.. Use the scan codes to replace parts--don't just start swapping parts till it works.
SECTION 303-08: Engine Emission Control
1999 Cougar Workshop Manual
REMOVAL AND INSTALLATION
Exhaust Gas Recirculation (EGR) Valve
Removal
Remove the air cleaner outlet tube.
Disconnect the intake air bypass hose.
Disconnect the positive crankcase ventilation hoses.
Remove the air cleaner outlet tube.
Disconnect the tube from the exhaust gas recirculation valve.
Remove the exhaust gas recirculation valve.
Disconnect the vacuum hose.
Installation
CAUTION: When cleaning the gasket faces, do not allow debris to enter the intake manifold or exhaust gas recirculation valve. Clean the gasket faces of the intake manifold and exhaust gas recirculation valve.
Install a new exhaust gas recirculation valve gasket.
Position the EGR valve and install the bolts.
Install the vacuum hose.
Connect the EGR tube.
Install the idle air control valve. For additional information, refer to Section 303-14A . For additional information, refer to Section 303-14B .
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
CAUTION: When cleaning the gasket faces, do not allow debris to enter the intake manifold or exhaust gas recirculation valve. 
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