This is great info. Thanks. I wonder if anyone can help me with a slightly different senario? My 3.8 96' has the CEL on and the code came up 1538. The mechanic (non Ford) told me it meant IMRC Bank 1 was bad. Ford however says they don't go by bank 1 or 2 but that I needed to know if it was the IMRC nearest the radiator or the one nearest the firewall (firewall side part number F65Z9S514DA) or the radiator side ( number F65Z9S514CC). Does anyone know which one that would be for Bank 1? I looked at wiswind's photos but didn't find any identification for the individual IMRCs. Photos where great however!!
Also I followed the advice above and discovered that with the engine OFF or ON at IDLE both IMRCs remain open and do not close. I have tested and checked the actuator arms and butterflies. They are all lubed and work easily. Taking the vaccum lines off (they are 2 white tubes that come from a Y vaccum line) I don't feel hardly any vacume and next to the front IMRC is the red vaccum line going to the fuel pressure regulator and it has great vaccum. The question.... are the IMRC vaccum lines vaccum source, controlled by the electrical IMRC plugs or by an independent other source? Because I am wondering if I have a vaccum leak (I can't see where the vaccum lines go as they disappear behind the rear injector/maniford) which could be why neither IMRC units close at idle. Or is the vaccum controlled by the IMRC electrical inputs and thus the IMRC's are both bad? I did do the test where you attach a vaccum line to each IMRC and suck and they both close easily.
I almost went and replaced the one for $268.00 but now not sure if that will fix my CEL code. Any suggestions or advice as to the solution and more troubleshooting is greatly appreciated. In the intermin I may wired them closed as suggested but ultimately I want to fix them correctly.
Thanks for your help.
Mack
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