IRCM Question

[1991SHOnewb]

Hello all, long time reader first time poster. I just picked up a 90 SHO MTX with 140K miles for free. Its really doggy after approximately 5K RPM. I read through hundreds of posts and came to the conclusion that the IRCM that I have is for a 3.8L taurus (so the fuel pump secondary voltage probably isnt kicking in). (I did check the secondaries and the are opening and closing just fine) I have another IRCM but its for a 91+ SHO and with it the car wont even start. SO, my Question is what IRCM part numbers will work on my 90 MTX? Oh, and wheres the cheapest site to get one? Thanks for the help

 

[sdpatt]

If your secondary butterfly valves are opening as designed at 3950 rpm, then the ICRM is working properly. ICRM stands for intake manifold runner control and the 3.8L engine did not have a staged intake I don't believe.

Check the EEC trouble codes with the key off engine off (KOEO) test. A search will find a plethora of posts with insstruction on how to perform this with nothing more than a jumper wire (even a paper clip) and the ignition key.

My first suspicion is a failed catalytic converter that is blocking the exhaust system. This failure restricts exhaust flow and limits power at the upper end of the rpm range. A gentle tap on the cats will determine if one or both of the cats has exhausted its nine lives (pun intended).

 

[1991SHOnewb]

89-90IR(elay)CM = 91+CCR(elay)M also IR(unner)CM

Actually, thanks, but you're half wrong. According to AllData IRCM stands for Integrated Control Relay Module on 89-90 SHO's. 91+ it is called the CCRM: Constant Control Relay Module. They're the same thing and contain the relays for fuel, A/C, etc. So on the 89-90's supposedly there is a second relay for fuel that increases the voltage above a certain RPM to give more fuel pressure. SO, my original question was does anyone know the part numbers available for 89-90 SHO IRCMs? But, I got it, it's F6DZ-12B577-BA for anyone else trying to find one. IRCM Also stands for runner control on most models, so you were half right. Thanks for the reply though

 

[sho_sc]

Actually, thanks, but you're half wrong. According to AllData IRCM stands for Integrated Control Relay Module on 89-90 SHO's. 91+ it is called the CCRM: Constant Control Relay Module. They're the same thing and contain the relays for fuel, A/C, etc. So on the 89-90's supposedly there is a second relay for fuel that increases the voltage above a certain RPM to give more fuel pressure. SO, my original question was does anyone know the part numbers available for 89-90 SHO IRCMs? But, I got it, it's F6DZ-12B577-BA for anyone else trying to find one. IRCM Also stands for runner control on most models, so you were half right. Thanks for the reply though

E8AZ-9H465-B is the Ford number for the 89-90 models. Somewhere in my mind, I think that the secondary controller used on SHOs are also used on other Ford models, but they have another number.

 

[dantheman68]

i thought we had mechanical fuel pumps... am i wrong?... someone in this thread is really confused.. i think its me...

 

[sho_sc]

i thought we had mechanical fuel pumps... am i wrong?... someone in this thread is really confused.. i think its me...

Electric Fuel pumps .... 89-90 models have a 2 speed pump via reduced voltage. 91 models are "wired" for it, but don't have the resistor.

 

[AREA 91]

We have electric fuel pumps.
The ICRM is the secondary butterfly circuit on the back of the intake. This is responsible for the secondary butterfly's to open at 3950RPM.


The CCRM is a black box that contains the relay's for the rad fan, fuel pump, etc... This is located under the radiator schroud. I know for a 91 it's got a big M on it.

 

[whiteman_01]

I had the same problem that you are having now. I went from a J module, to an M module. Well that didn't fix the problem. Make sure you check for intake leaks, thats what my problem was. I had ONE intake bolt that was loose, and it did the same thing your is.

 

[Rockledge]

Actually, thanks, but you're half wrong. According to AllData IRCM stands for Integrated Control Relay Module on 89-90 SHO's. 91+ it is called the CCRM: Constant Control Relay Module. They're the same thing and contain the relays for fuel, A/C, etc. So on the 89-90's supposedly there is a second relay for fuel that increases the voltage above a certain RPM to give more fuel pressure.

Scott is correct. You have your acronyms mixed up.

The I M R C is the Intake Manifold Runner Control, i.e., the secondary butterfly circuit on the back of the intake, which is, as noted, responsible for the secondary butterflies opening at 3950RPM.

The I C R M is the Integrated Control Relay Module, which in later years is indeed called the CCRM. This is the black box located up front near the top of the radiator, and is chock full of relays.