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My 1996 Duratec Mystique has had continuous IMRC problems ever since my Merc. dealer replaced this unit to kill off a CEL. The car ran like a rocket before and was returned a dog. Of course the dealer could not see / feel what I was talking about when I returned to the scene of the crime. The secondary runners would not open as they did before so the engine would not rev beyond 5000 rpm and was very flat in acceleration.
I opened the secondary intake valve linkage by hand and found that a Stanley 2" "L" bracket can be wedged into the linkage directly under the main throttle body. This hold the secondaries open at 100% and allows the engine to once again scream to 6-7,000 RPMs with a dramatic , smooth power curve. Low end torque seems okay and the power sweet spot has returned beginning at 3,500 RPMs and up. I finally pulled the #4 and #11 fuses to re-program the main computer to the new air flow values. My car is once again a rocket and I do not have to purchase another IMRC for several hundred dollars.
I can also remove the "L" bracket for dealership / valet parking to protection in one minute.
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Joined: Feb 2001
Posts: 2,915
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sorry this doesnt help you out but, come join us here in the CT forums too  http://www.contour.org/cgi-ubb/ultimatebb.cgi?ubb=forum&f=45
www.shox.com Dealer Koni's 135 a piece Eibach's 190 a set KYB's 70 a piece H+R's 225 a set see profile for website, aol name, etc Business:WestEndMobil@yahoo.com Personal:Corey_pimp1@yahoo.com 1998.5 SCSVT ($16000 takes it) 2001 GSXR-1000 1988 Corsica (the beater)
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Joined: Jun 2001
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"careful man, there's a beverage here."
e-mail: boseraq@hotmail.com
aol IM: madhat1412
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Joined: Dec 2000
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Can you take a picture of this L Bracket so I know what to look for when I go to Lowes or Home Depot? Or just tell me the part number for the Stanley piece...
Nik
1999 Mercury Cougar V6
KKM Intake,SVT TB, SVT Upper/Lower, 19lb injectors, Diablo Chip, MSDS Headers, Custom Exhaust, B&M Short Shifter, Progress Lowering Springs, 18" Axis TC's, OMP Strut Bar, AAM 24mm Rear Sway Bar, Koni Struts
15.09 @ 91.54(corrected, pre-SVT conversion, DiabloChip, and Injectors)
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Joined: Nov 2001
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The 90 degree , "L" bracket is a standard 2 inch piece with 4 holes drilled into it. I found mine in the basement!
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Joined: Mar 2001
Posts: 4,899
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Hmmm that might break it....forcing it open is a problem. For free, you could remove the whole assembly! 
Dan Parmelee
1999 Acura Integra SiR-G coupe
"I heard Affleck was the bomb in Phantoms"
"Word, bitch! Phantoms like a muhfuka"
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Joined: Sep 2000
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Pinning the secondaries is nothing new.
Simple way is a cable tie. Fast, cheap, effective way to TEST with...
BTW - You will now permanently throw a P1518 CEL and the PCM will cut timing & fuel... Disconnect the IMRC plug and it will get worse...
Next time you start the car look for it... It will be there...
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Joined: Nov 2001
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My IMRC is not working and I do not have a CEL code so my cheap fix is ideal. The power has returned and I feel that the ignition and fuel are where they need to be.
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Joined: Jun 2000
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Originally posted by roger blose:
...and I feel that the ignition and fuel are where they need to be. We have dyno proof and OBD-II plots that prove otherwise... The IMRC stuck open MIL may not illuminate right away, but it will if the linkage is stuck open for two full drive cycles IIRC. If it doesn't, you might want to check the wiring running to the IMRC as your problem source. If the IMRC monitoring circuit can't be completed, the ECU won't notice that they're pinned open, hence no MIL. BTW, the kick you feel around the same RPM isn't the same as when the IMRC's open... since the injector is in one port only, it normally gets a certain speed of air passing by it at lower RPMs which create the proper air/fuel mix. Pinning the secondaries "steals" some of that air into the secondary port (separate from the primary runner all the way into the cylinder), which slows the primary runner air and creates a poor burn mixture. Without a way to add more fuel pressure, longer pulse width, or higher speed air, what you're fealing at around 3500 RPMs is the air speed finally reaching the point where you're getting a good burn mixture as well as the timing bump from the ECU "expecting" the IMRC opening point.
Brad Noon '99 SE MTX 3 point oh my God H.O. 179HP/178TQ BNMotorsports Floormats, powder coating, TB optimizing, Gutted cats, etc BNMotorsports is now the preferred distributor of Contour/SVT/Mystique Indiglo style gauges!!!bnmotorsports@msn.com
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Joined: Sep 2000
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Originally posted by bnoon:
We have dyno proof and OBD-II plots that prove otherwise... Also there is no posible way you are not throwing the P1518 CEL with them stuck open like you say they are...
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