This diagram doesn't help. I need a diagram of the back side just to the Left side of the EBT / EGR (as you look at this diagram). There is a 3/8 - 1/2 inch hose that is on the intake manifold and just to the left of that hose and down toward the floor there is a male vacuum hose receptacle that I need to know where the hose goes. Somehow this connection got knocked off and there is no visible sight of it anywhere. Please provide a detailed diagram of the hoses on the back side of the intake manifold so I can know where to connect this missing hose.
No. This is a diagram to the right side of the throttle body the placement I need to see is to the very back (firewall side) and to the Left side of the EGR / EBT as you face the firewall from the front number there is a hose visible between the intake manifold and the top of the cavity (just below the windshield. The diagram I need is below (toward the floor) and slightly to the left of that larger hose.
Yes, please post so someone else may be able to help. Thanks for using the resources that you have available.
I am willing to wait... however after checking with the salvage yard I am convinced that what I thought was an open male vacuum receptacle is not a vacuum port!
The problem I am having is this - After changing my timing belt and a number of pulley bearings etc. the engine fires up immediately and runs fine until the fast idle kicks out. The Autozone handheld diagnostic reveals that there is a multiple random misfires. The van runs great on the highway and performs well. I suspect the IAC valve may be gummed up a bit causing the rough idle - though there is no code reading of a malfunction of this item.
I can't seem to locate the IAC valve... the placement of this valve apparently is buried under the Intake Manifold (firewall side). I have placed a light back there and can't see the valve or the solenoid that accompanies this part. I'm wondering if I have to take the intake manifold off to even see the IAC valve.
Please advise on the possibility of the IAC valve as a likely cause of the rough idle as well as the location of the IAC. According to my manuel it is to the right side (Right as you sit in the Driver's seat) of the ERG/ EBT (though I can't seem to see it.
Yes, keep looking - I need to get my van back on the road! Surely you have someone who works on Mercury / Villagers?
When you say the IAC is "on the upper intake manifold" do you mean on top of the manifold? Or, is it underneath the manifold?
I have a picture of the IAC printed from AutoZone it appears to have 4 bolt holes holding it down - so I am confused.
You said it is about 3" forward of the Throttle body; I'm assuming that is drivers seat Left - That is where the EGR valve is... is it behind the EGR? or further beyond the EGR? A picture or diagram would really be helpful.
I still have not been able to locate the IAC valve. I have found 2 different designs on line. While they are similar they are different. Both are listed as IAC valve for a 1999 Mercury Villager. I have found nothing fitting this design on the back of the intake manifold. Again, is the "2 bolt IAC valve visible on the top of the manifold or is it buried behind the manifold or underneath the "overhang"?
Ok, I've found the AIC valve. It sits right out in plain sight. I have removed it and cleaned the chambers but still have a rough idle. By the way FYI there are 4 machine screws (phillips heads on each) holding the top plate to the throttle body on this model. This one does not match either of the two types I mentioned above. Apparently the Haynes manual that I have show pictures of a Quest which located their IAC on the passengers side just about under the windshield wiper base. It also has an idle adjuster screw you can reach from the top of the motor.
That aside. I have purchased a IAC valve from a salvage yard and I will install it with a different throttle body and a different EGR - all came off a 2000 which is compatible with my '99. I plan on cleaning each of these items really well and replace my parts with them. I'll try this next week.
If you have any other suggestions regarding what to look for next to solve this rough idle problem please share your ideas!