I believe it is at the top rear of the engine (between engine and firewall, just left of center (passenger side). You have to remove (2) bolts (bolted in from the back, toward the front of the vehicle), next, remove the EGR tube nut that goes to the bottom of the valve. Typically, the valve does not go bad. You can test the EGR valve by removing the vacuum connector from the top of the valve, and add vacuum to the top of the valve. If the valve works, the engine will shudder when vacuum is applied. Typically EGR problems on these are caused by the DPFE senser that is located next (toward driver's side)to the EGR valve. It also bolts in from the back with two small bolts, and has (2) vacuum hoses connected to the bottm of the switch.
Where is the location of the EGR valve on a 1997 Mercury Mountaineer V*
The 2002 Mercury Mountaineer EGR valve can be found in the engine compartment, on the firewall. The EGR valve will be labeled as such.
THERE ISNT ONE THERE IS A PCV VENT LOCATED AT THE REAR OF THE ENGINE
The EGR valve on the 2001 Mercury Mountaineer is located on the engine block just to the left of the intake manifold. The damaged valve will cause the check engine light to flash.
The 1997 Mercury PCV valve is located on the outside of the air cleaner housing. The PCV valve can be found on the back of the housing.
The rubber valve stems are on the wheels , they allow you to put air in the tires
1997 was the first year of the Mercury Mountaineer and the only engine available was the 5 liter over head valve ( OHV ) design with ( 2 ) valves per engine cylinder
On a 1997 Mercury Mountaineer : The engine oil filler tube for the 5.0 litre / 302 cubic inch V8 engine is on the valve cover of the engine , on the right side ( passenger side ) near the front of the valve cover
On V6 models the PCV valve is located on the back side of the left valve cover. On V8 models the PCV valve is located on the top of the left valve cover.
I have a 2002 Mercury mountaineer, took it to the ford/Mercury dealer, They said there is a valve inside of it and this is why i can put gas in it. $1200 to replace. I guess I need to find a used tank for $100 and do it my self.
This vehicle does not have a bleed valve, it is not needed.
The 1999 Mercury Mountaineer either has the ( 4.0 liter Single Over Head Cam , V6 engine or the 5.0 liter V8 , which is an over head valve / pushrod design engine ) Helpfull
Specify Vehicle, they are all different
Code P401 means:Exhaust gas recirculation (EGR) valve insufficient flow detected
Top of the left valve cover V8; about in the middle of the valve cover hidden underneath the air cleaner assembly. Back side of the left valve cover V6
In a 1999 Mercury Mountaineer : Either the 4.0 liter Single Over Head Cam ( SOHC ) V6 engine , or the 5.0 liter V8 , which is an over head valve / push rod design engine
The engines in a 1999 Mercury Mountaineer ( 4.0L Single Over Head Cam V6 and the 5.0L Over Head Valve V8 ) are both fuel injected , so there is no carburetor
On one of the valve covers. I found mine on the back of the intake manifold withe a t going to the front and back of the engine.
The 2001 Mercury Mountaineer came equipped in the 4.0L V6 and 5.0L V8. The idle air control (IAC) valve is component attached to the throttle body assembly. The actual OEM factory part is Hitachi #ABV0015, and the Ford Motorcraft OE replacement is #CX1851.
The idle air control valve is located on the side of the intake manifold right next to the throttle body
Replace your IAC Valve-No more stalling
Remove the vacuum hose from the EGR valve. Pull the valve out of the air cleaner housing. Reverse the process to install the new valve.
The cam position sensor on the 4.0 L - SOHC - V6 engine is by the oil fill cap on the drivers side valve cover
Could be a leaking vacuum line or with the pcv valve. It is possible that the trannsmission clutch packs arent dissengaging properly causing it to stall. PCV valve is a likely culpret with idle and stalling issues. Start there first.