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OK, finally got around to doing this to the ol' Contour. What a massive difference it makes going from non-working IMRC to working IMRC.
Instead of replacing your IMRC, either fix it this way, or the first 8 people to send me their board with motor can have me fix it for $35 shipped back to you. I have 8 of these transistors left, so first come first serve!
Feel free to put this in the FAQ or sticky.
IMRC Fix, How-To
And for the people that might say "But I can get one of these from a junkyard for that", you're still getting the factory IMRC transistor that fails. The TIP121 has MUCH better heat tolerances.
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i have a question. i have a pretty new imrc that i baught new from ford a few months ago. it works and all but i get a p1518. what causes that. i think it happened when the imrc came off the relocation bolt. so now my engien stays on and i cant seem to figure it out. do you have any idea what i can do.
when i had my stock imrc it was acting up real bad. once the car got pretty warm it wouldnt work at all. so i just moved it under the battery and never had a problem with it untill the cable ripped from battery acid getting to it.
i belive the valve cover heat realy effects the electronics in it.
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Good how-to.  Thankfully my IMRC box hasn't gone yet...but it's nice to know this info/fix is available!
1998 Mystique LS:
-2.5 Duratec ATX
-Vibrant White
--------------------
=Pics=
=Info=
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Nice info 
00 Mystique LS V6 ATX
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I have no life
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-'96 SE MTX 3L
-'98 SVT 1,173 of 6,535
-'05 Mazda 6s, loaded, g/f's ride
-Need a 96-00 manual on CD? PM or email me
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my IMRC casing is cracked. i have a replacement one but havent been able to figure out where that cable ends up. any tips or just tell me where it ends? any tips on removing it?
'98.5 Black Ford Contour SE Sport 5-speed. All the SE Sport features with all the 98features that were supposed to be decontented for 98.5
'04 Silver Toyota RAV4 L Auto. Fully loaded.
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Originally posted by DanburySE:
my IMRC casing is cracked. i have a replacement one but havent been able to figure out where that cable ends up. any tips or just tell me where it ends? any tips on removing it?
it goes under the throttle body.
G/f's black 99se sport 5 speed
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Thanks Chris! You are a lifesaver. I didn't want to buy a new one!
I guess radio shack only carries the TIP120 transistor. Do you think that will work, or do I need the TIP121 ?!?! If so, where can I buy a TIP121 not over the internet. I would like to have it tomorrow and I don't want to wait for shipping, etc...
Thanks again Chris! Great post.
Jeff
For Sale - 96 Tour Sport 2.5L MTX with SVT Exhaust, pre 98 trunklid with newer Contour Sport spoiler instead of lip spoiler, newer Contour sport rims. Newer paint job. Brand new floor mats. Rust Free! PM me for details and pics.
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Originally posted by cvkillacontour98:
i have a question. i have a pretty new imrc that i baught new from ford a few months ago. it works and all but i get a p1518. what causes that. i think it happened when the imrc came off the relocation bolt. so now my engien stays on and i cant seem to figure it out. do you have any idea what i can do.
Don't totally understand everything your asking but did you check to see if the cable from the imrc is still hooked up? I think I had that code last time I repalced my fuel injector harness, I had to remove the imrc box. Sure enough the cable was off.
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Just what I needed! Just when I needed it! Thanks! 
'98.5 SVT#5826 of 6535, Silver Frost-As fun to drive as my old MR2 and way more practical!
Not as much fun to drive as my Turbo Rx7 was, but it starts every time!
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the cable is hooked up and everything is workign ok. but i keep getting a p1518.
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anybody have a picture of where the cable connects? maybe a list of what must be removed to install?
'98.5 Black Ford Contour SE Sport 5-speed. All the SE Sport features with all the 98features that were supposed to be decontented for 98.5
'04 Silver Toyota RAV4 L Auto. Fully loaded.
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Originally posted by 92x_Hightower:
OK, finally got around to doing this to the ol' Contour. What a massive difference it makes going from non-working IMRC to working IMRC.
Instead of replacing your IMRC, either fix it this way, or the first 8 people to send me their board with motor can have me fix it for $35 shipped back to you. I have 8 of these transistors left, so first come first serve!
Feel free to put this in the FAQ or sticky.
IMRC Fix, How-To
And for the people that might say "But I can get one of these from a junkyard for that", you're still getting the factory IMRC transistor that fails. The TIP121 has MUCH better heat tolerances.
Yet one more example of why this is such a GREAT site!! I'll print this out tomorrow at work and file it with my other Contour stuff. Thanks for a great how to and the pix to make it idiot proof.
'99 Sport TropicGreen,Duratec, SVT exhaust, Brembo rotors, Ceramic pads, K&N filters(oil & air), Alpine CDM7874, Polk DB570 speakers front and rear. Fog light mod. 50% Formula One tint.
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Excellent how-to! Here's a link to order the transistor but be warned there is a minimum order charge. Digi-key Also, make sure to use thermal compound (that white greasy stuff in the pic) or you could have another fried transistor in short order.
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Originally posted by Mustang:
Excellent how-to! Here's a link to order the transistor but be warned there is a minimum order charge. Digi-key Also, make sure to use thermal compound (that white greasy stuff in the pic) or you could have another fried transistor in short order.
There is a thermal pad between the transistor and the housing. I chose not to put that plastic screw back on since the heat from the housing will just heat up the transistor.
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IMRC fix for those with heat related issues. Unfortunately i don't think this will solve my broken cable IMRC issue. 
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Originally posted by vpogv:
IMRC fix for those with heat related issues. Unfortunately i don't think this will solve my broken cable IMRC issue.
I have a broken IMRC cable too, and sadly I think you have to buy a new IMRC box. At least that is what I was told. 
-Reebs-
For Sale - 96 Tour Sport 2.5L MTX with SVT Exhaust, pre 98 trunklid with newer Contour Sport spoiler instead of lip spoiler, newer Contour sport rims. Newer paint job. Brand new floor mats. Rust Free! PM me for details and pics.
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Oh man THANK YOU!!!!
I knew you were going to be working on this soon and I was just thinking of PM'ing you to see if it was still going to happen.
This rocks! Thanks Chris!
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Didn't you post this like 40+ years ago?
I could have sworn I've seen this before when Kev and I both had the Duratec 2.5's
Awesome How-to by the way. another Hightower Mod to help the masses.....
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what hightower forget to mention that the power plug is glued to the metal box! it was extremely difficult to remove. This isnt for everyone.
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Originally posted by Contour1998:
what hightower forget to mention that the power plug is glued to the metal box! it was extremely difficult to remove. This isnt for everyone.
Mine wasn't. It slid off just fine. What, did you break your's?
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Hi Chris
I'm going to have to open mine up, but there must be more than one version (part #)IMRC's. My DC motor's on the right side of the box.
Or could just be the Ole Forgetter.
I'm definitely going to note this TIP121 Thanks. Did you find a schematic for this or just start tracing?
I had issues with mind related to the connector attaches to the pc-board. Re-soldered and lost that intermitnent pain.
I have 98 (07/97) and recently bought a another 98 built 08/98.
Good ole running changes I guess?
TNX for sharing
Paul
Paul
98 Mystique LS 2ea (07/97)(08/98)
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Ford uses that intake controller for a lot of stuff. Even the SVT Focus has the same controller.
Just so everyone is aware, I used the TIP121 transistor. I also think the TIP120 should work, too.
I do have 8 of these transistors left, so if anyone wants one or wants me to replace their's, let me know.
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Chris, do you know the specs (voltage, mostly) of the stock transistor?
Chris G.
~ 98 Mystique LS ATX
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Originally posted by Antiramie:
Chris, do you know the specs (voltage, mostly) of the stock transistor?
Well, the markings on it say 2N6045 and 648 with an (M) on it. This means it is a 2N6045 transistor which the datasheet can be found HERE.
They look to be similar to the TIP121 as far as function. However, the (M) on the chip means it might be a Motorola and this particular rev seems to go bad with lots of heat (defective operation)
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According to multiple websites, the TIP102 is a superior replacement for both the 2N6045 and TIP122 (both 100v models). The spec sheet for the TIP102 shows that its power dissipation and thermal resistance are better than the other two. Here's the page (use Search on left) that will give the spec sheets for all three: http://www.futurlec.com/Transistors.shtmlI'm going to try to replace mine soon, and I'll probably use the TIP102. Just food for thought.
Chris G.
~ 98 Mystique LS ATX
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TIP102 is TO-220AB package and TIP120/1/2 is TO-220 package. Not sure what the difference is though.
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The website I posted lists all three models (Motorola manufactured) as being TO-220AB package, and not just the TIP102. Other websites also list all three as being in the same package (whether it be TO-220 or TO-220AB), as long as the manufacturer stays consistent in your search. For example, Motorola manufactured TIP102, TIP122, and 2N6045 all are TO-220AB, whereas the majority of other brands all seem to be TO-220.
So, if the stock one is a Motorola, a TIP102 that's made by Motorola should work.
EDIT: This website has a couple tables listing the differences between the TO-220 and TO-220AB.
http://64.233.167.104/search?q=cache:-UcfYi2juicJ:www.fairchildsemi.com/pcn/PCN/2004/20041802-A.rtf+to-220+variation+ab&hl=en&gl=us&ct=clnk&cd=1
Chris G.
~ 98 Mystique LS ATX
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Not sure if this Q has been answered, but will you ALWAYS get a code if they aren't working?
98 E0 SVT with some stuff
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I was told by a dealership that a code should always appear if the IMRC is malfunctioning, but mine hasn't been working for awhile and I've never had a code show up.
Apparently, though, my mechanic pulled a stored(?) code a long time ago from my car, revealing the IMRC malfunction, but a CEL never showed up before he shared that information. So either my car doesn't like to show IMRC related CELs, or other Contours share the same problem.
Chris G.
~ 98 Mystique LS ATX
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My IMRC has been going on and off on me but i never get a CEL. It sucks when you are ready to get on it and you hit 3800 rpm's and then nothing happens.
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Originally posted by stilov:
Not sure if this Q has been answered, but will you ALWAYS get a code if they aren't working?
No. If the transistor is bad, the IMRC will function properly until the engine is warmed up. Then, the IMRC box heats up and causes the faulty transistor to stop holding a load. I imagine that the IMRC not functioning isn't enough to cause a CEL since it's not going to cause damage to the engine.
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